Document 78JDBkRBxLoVZZ0ZxVbzL99V

SC-ELEC-00300 CAB CORD This is a specialty product, designed for drop light cords in steam engine cabs. Rubber covered wire in this application had only a short life, the high temperatures vulcaniz ing it rapidly and the constant motion and vibration cracking it and causing mechanical and then electri cal failure. Cab Cord is made by twisting two conductors of plain fixture wire (see "Fixture Wire" bulletin) together and placing a heavy asbestos braid overall. The impregnation throughout is the black, flameproof and moistureproof compound. Being permanently flexible even under high temperature conditions, ROCKBESTOS cab cord gives far longer service than any type of material that has been used and almost all railroads in the country are now buying it. Iron and steel mills use it for extension cords in trouble lamps when the men go into furnaces to clean them sometimes before they are cooled. For severe service the individual conductors are insulated with a combination of varnished cambric tapes and felted walls, then twisted and braided over all. This V.C. type cab cord Is used instead of plain cab cord for lighting circuits on locomotives if a train control system is installed. If single insulated wires afe preferred, A.V.C. cable or Table 3 material (Switchboard Wires and Cables bulletin) should be recommended. \ RBB 00379 HEAT lira UNITS These are sold to manufacturers of low wattage heating devices such as t Curling irons Soldering irons Hair wavers Hot water bottle heaters Immersion heaters Necktie pressers Incubators, etc. The units are made to specification as to physi cal size, wattage, etc. They consist of a number of asbestos yarns bunched together to form a core with resistance wire.wound helically over the core so that the turns do not touch. This is then out into prede termined lengths. Plain copper lead wires are then attached to the ends of the short lengths of element by a meehanioal connection, forming a continuous link arrangement from which the name "sausage element'* is derived. This is then insulated in a continuous length and when out in the middle of each lead wire a complete heating unit with lead3, ready for connections, results. It looks like this: --iwcAqwicd/ jvnefion* --v S___ _ v t________ D eo+ Ar (ip c.nMrJ HEATING ELEMENT This la made the same way except it is not made in units but is fhmished in quantity and out by the appli ance nanufaoturer to his own requirements. It's used in incubator s heater pads, etc. permanent wave ovens waffle irons percolators Marcel wavers toy flatirons radio resistor devices RBB 00380 a woo age in = I-- U0 D a' o- n Cl - (/) 0H o U) UJ 1 O 0 o a: u MULTI-CONDUCTOR CONTROL CABLE This is a new product with us in the form shown oppositej that i3, new in the sense that we have not supplied the combination before.' But the insulation of the individual con ductors is our Table E type with the exception of the cotton instead of the asbestos outer braid. Central stations are the principal pros pects for this type of material as they have been using rubber insulated control cables in boiler room circuits. The illustration shows a white asbestos outer braid but the cable can be taped before ap plication of the braid and the braid then finished with the standard black compound. sees*#1- RBB 00383 ROCKBESTOS -the asbestos covered wire MOTION PICTURE CABLE to, 1030 RBB 00384 Rockbestos Extra Flexible Motion Picture and Arc Light Cable OCKBESTOS motion picture cable combines all of the characteristics which are neces R sary for supplying power to projection machines, spot, flood and other arc lighting equip ment. It will not deteriorate wich age, burn or communicate fire even if it be subjected to contact with an electric arc. Extreme flexibility is of utmost importance so that no matter what position the apparatus is placed in, the cable will conform without any tendency to destroy the adjustment. The copper conductor is composed of a large number of fine copper wires, thoroughly annealed and of uniform and extreme softness stranded together into a rope like structure resulting in this necessary flexibility. ROCKBESTOS insulation is applied to the conductor so as to produce a continuous felted wall of uniform thickness, saturated with a special chemically neutral compound, which has the necessary dielectric and mechanical strength and will remain permanently flexible. Over this insulation a closely woven braid of asbestos is applied, saturated with a w hite flame proof compound which provides a tough smooth outer surface which will resist abrasion, and will not flake off. J PROTECTION ROOM SUN ARCS We manufacture asbestos insulated wires and cables for ecery purpose. Descriptive bulletins on request. RBB 00385 HOTIOW PICTURE CABLE As the name indicates, the principal use for this type of material is on projectors, spot lights, sun arcs and similar apparatus, where the fire hazard is high. This type of apparatus requires an extremely flexible conductor and a correspondingly flexible, flameproof insulation. A central station engineer who bought our Table I wire for his swinging switchboard panels was using a flexible lamp cord (rubber insulation with cotton braid) for the hinge connections between the termin al strip in the swinging panel and the one on the wall. We suggested he use motion picture cable of the proper size as it was more than sufficiently flexible for his needs and also fully flameproof, the Ideal material for the application. See photograph entitled "ROCEBESTOS Wired Board Toronto Hydro-Electrio System*. Practically all manufacturers of motion picture apparatus in this country equip their products with or recommend the use of ROCEBESTOS motion picture oable.^ ... tifttwr usest -Sr--- Connections on blueprint machines from the arc lamp to the terminal box. RBB 00386 Rockbestos Extra Flexible Motion Picture Cable National Electric Code Standard Construction Specification Size B&S Gauge 2 4 0 s 10 12 14 lo IS Carrying capacity amperes Strandings Thickness wail mils Outer covering 125 7 x 7 x 59/36 40 <>0 7 x 7 x 37/36 40 70 1050/36 40 50 665/36 35 30 413/36 35 25 65/30 30 20 41/30 30 10 26/30 25 5 16 30 25 5u 2 wo " i9 >1 wa O. D. ,535 .440 .385 .320 .275 .235 .225 .210 .195 Weight in lbsper M. ft. i 11 Standard shipping lengths in feet coils 303 150 195 250 130 i 500 81 ] 500 58 500 41 1 1000 31 j 1000 25 ! 1000 20 ! iooo Finished O. D, given above is nominal. A tolerance of plus or minus 5% is necessary on ac count of variations in process of manufacture. Rockbestos Motion Picture Cable is approved by Underwriters Laboratories, inc. MOTION PICTURE PROJECTORS RBB 00387 RBB 00388 ROCKBESTOS -the asbestos covered, wire MAG WIRE RBB 00389 i Rockbestos Magnet Wire ROCKBESTOS Magnet Wire is made in all standard sizes of round, square and rectangular cross section. The dielectric and mechanical strength of Rock bestos insulation will meet all requirements of service and coil winding and will not fail under extreme heat conditions even up to the fusing point of copper. ROCKBESTOS insulation will withstand fumes of practically all acids and this makes its use essential in all coils operating under these conditions. The conductor is thoroughly annealed copper of uniform and extreme softness and of 98.5% electrical conductivity, according to Matthiesen's Stan dard. It is carefully inspected for accuracy of dimensions. The insulation is pure long fibred asbestos, commercially free from me tallic oxides, thoroughly separated, carded and spun into roving which is wound uniformly upon the conductor and then saturated with a special chemically neutral compound, and compressed into a continuous wall of insulation of approximately the same thickness as double cotton covering. Round Copper Magnet Wire is furnished in either white, black or P. N. (amber) finish. Rectangular and square are furnished in either white or black finish. The finished wire may be elongated 10% without harm to the Rockbestos insulation, thus allowing for bends necessary in the manufacture of coils. manufacture asbestos insulated wires and cables far every purpose. Descriptive hjlifiinj on request. RBB 00390 MAGJTET WIRE This is made in several finishes; black, white, P.1T. and B.F. In selling the material the best method is to attempt to prescribe a finish for the conditions under 7/hich the wire will be used. The black finish is moistureproof and flameproof and if a motor is to be subjected to considerable moist ure, spray, acid fumes, etc. this would be the type of finish to recommend. The v/hite finish will withstand high temperatures such as would be generated in the windings of a motor which was suddenly overloaded, an elevator motor, for instance. If the wire will be subject to considerable abra sion during installation the inssulation should be tough enough to withstand this abuse and not tear and the P.H* finish, an air drying varnish finish, is the finish to prescribe. The B.F. is similar to P.N. but even tougher, tha asbestos being impregnated with a special heatproof, moistureproof and acidproof insulating cement which is later baked at a high temperature. Asbestos insulated magnet wire is used in brake coils armatures field coils lifting magnets relays, etc. etc. solenoids of electrically operated track switches (tramway) - circuit breaker coils small reactors There is a process now in development which will enable us to produce asbestos insulated magnet wire in sizes #14 B&S gauge and smaller with outside diameters no larger than double cotton covered wire. RBB 00391 Magnet Wire continued An entirely new field of applications to small motors and other devices will probably result es pecially if the co3t of the asbestos insulated wire is the same a3 or only a little in excess of the cotton covered wire. RBB 00392 Round Copper Magnet Wire Size B. & $, Gauge 0000 000 00 0 1 > 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 17 28 BARE WIRE j Diameter Inches .460 .410 .365 .325 .289 .258 .229 .204 .182 .162 .144 .129 .114 .102 .091 .081 .072 .064 .057 .051 .045 . .040 .036 .032 .029 .025 .023 .020 .018 .016 .014 .013 Area Circular Mils 211600 167800 133100 105500 83690 66370 52640 41740 33100 26250 20820 16510 13090 10380 8230 6530 5178 4107 3257 2583 2048 1624 1288 1022 810 642 509 404 320 254 202 160 i 1 : i : , ! 1 | I : i : : | ; 1 i i ; i ! ; j : ROCKBESTOS COVERED WIRE Insulation Thickness Mils Approximate Diameter over Insulation in Inches Approximate Pounds per 1000 ft, . 10.5 .481 o47 10.5 .431 513 10.5 .386 409 10.5 .346 325 10.5 .310 258 10.5 .279 205 10.5 .250 163 10.5 .225 130 10.0 .202 103 9.0 .180 82 9.0 .162 65 8.0 .145 52 7.0 .128 41 6.5 .115 33 6.5 .104 26 6.5 .094 21 6.0 .084 16 6.0 .076 13 6.0 .069 10.4 6.0 .063 8.3 6.0 .057 6.6 6.0 .052 5.3 6.0 .048 4.2 6.0 .044 3.4 6.5 .042 2.80 6.5 .039 2.28 7.0 .037 1.86 7.0 .034 1.51 8.0 .034 1.29 8.5 .033 1.09 9.5 .033 .95 10.0 .033 .83 Rockbestos Round Magnet Wire is furnished on reels with standard full reel quantities as follows: 0000 -- 13 B. & S. Gauge 200 lbs. 14 -- 28 B, Si S. Gauge 50 lbs. Rockbestos Round Magnet Wire is furnished in jet-black, snow-white and P. N. finish. This latter finish is our more recent development and is recommended in sizes from 28 to 6 where an exceptionally tough outer finish is desired. Rockbestos Magnet Wire is unequalled for use in manufacture of armature and series and shunt coifs for railway, mining, mill, and genera! industrial motors, for coils in lifting magnets, for brake coils and all types of electro-magnetic windings, solenoid coils, welding transformers -- wherever windings are subject to temperature conditions. RBB 00393 Rectangular and Square Magnet Wire Since Rectangular and Square Magnet Wire can be made in so many different sizes and with so many different thicknesses of insulation, it becomes impractical to completely tabulate them all. The following table lists the nominal difference between the width or thickness of Rockbestos insulated conductor and corresponding dimensions of bare conductor. Bare Copper Width in Inches Bare Copper Thickness in Inches .0 to .020 .021 to .040 .041 to .050 .051 to .080 .08! to .095 .096 to .103 .104 to .110 in to .120 .121 to .13? . 136 to . 145 .146 to .160 .16! to .175 ,176 to .195 . 196 to .21 5 .216 to .240 .241 to .270 . .0 .0% .121 .146 .176 .241 .301 i .351 To .095 To .120 To .145 To .175 To .240 To .300 !i .T35o0 '1 To .500 Nominal difference between width or thickness of insulated conductor, and corresponding dimension of bare conductor -- Given in inches. .014 .013 .012 .011 .012 .016 .015 .014 .013 .013 .013 .014 .015 .017 .016 .015 .014 .014 .014 .015 .016 .016 .017 .017 .016 .015 .014 .014 .015 .016 .017 .018 .018 .018 .019 . .018 .017 016 .015 .015 .016 .017 .018 .019 .019 .020 .020 .020 .021 .022 .019 1 .020 1 .021 .018 i .019 i .020 .017 .018 | .019 .016 ! .016 .017 .016 f .017 .018 .017 : .018 ` .019 .018 .019 .020 .019 .020 .021 .020 i .021 1 .022 .021 .022 i .023 .021 .022 .022 i .023 .023 t .024 .022 .023 i .024 .023 i .024 ! .025 .023 ; .024 ; 026 .023 .025 .026 1 Rockbestos Square and Rectangular Magnet Wire is furnished in standard full reel quan tities of 200 lbs. Rockbestos Square and Rectangular Magnet Wire is furnished in either snow-white or jetblack finish. Offering for coil ivinding purposes a greater effective cross section of copper than round wire, Rectangular Rockbestos Magnet Wire finds its principal use in large industrial, railway and mine motors, synchronous motors and rotary converters, electric furnace windings and similar heavy capacity work. RBB 00394 CUBLING IROIf CORD Manufacturers of these appliances insist on an extremely flexible and lightweight, small diameter cord. Heretofore two rubber insulated tinsel conductors hare been twisted loosely together and a braid placed over all. This construction Is not approved by the Underwriters, We have developed a cord which is in real ity a lightweight heater cord with a tinsel conduc tor which now gives the curling iron manufacturer everything he wants in the cord and also a means of gaining approval for his device. RBB 00395 ROCKBESTOS -the asbestos covered, wire HEATER CORD ROCKBESTOS PRODUCTS CORPORATION NEW HAVEN. CONN. Caotral T*tm Btd|. N#w York 903 Clark Bid*. Fitteha*. P*. Madiaan Terminal BUf. Chiufo, 111. On th Pacific Cmj* C. D.nt SUuEhUr 7E APRIL I, 1929 RBB 00396 Rockbestos Heater Cord OCKBESTOS "30Q0" heater cord represents, what we believe to be, the finest heater R cord that can be manufactured. Nothing but the choicest of materials are used and each manufacturing detail is subjected to continual inspection. It has an extra flexible conductor and its construction is such that it will not kink in ordinary service on any kind of heating appliances, even those which are in motion, when in use. It meets or exceeds the requirements of the National Electric Code in all respects and every coil bears the Underwriters' label of approval. Underwriters' Laboratories approval requires an average performance of not less than 1000 cycles on their standard heater cord endurance machine. Rockbestos "3000" will average over 3000 cycles. The conductor is composed of the proper number of wires each No. 34 B & S gauge, cotton served and insulated with rubber over which is an application of Rockbestos roving which forms a continuous heat insulating layer of the most efficient type which protects the rubber from external heat and gives maximum durability and flexibility. Duplex cord is two such conductors twisted together with a short lay; then covered with a soft or glazed cotton, rayon, or combination of cotton and rayon braid. Twisted pair cord is two conductors individually braided and twisted together. Our standard braiding pattern is glazed cotton with rayon striper as illustrated on the opposite page, but can be furnished in any desired patcern and colors. ROCKBESTOS "3000" heavy duty heater cord is regular "3000" with the exception of the outer covering which is a heavy cocton, increasing its resistance to abrasion. Com monly used on commercial appliances which are in constant use such as laundry irons, restau rant percolators, toasters, waffle irons, etc. Rockbestos "X" heater cord is of the same general construction as Rockbestos "3000" except the conductor which is slightly less flexible; the individual wires being No. 30 B & S gauge instead of No. 34. It is designed especially for heating appliances that are not in motion when in use. It complies fully with the requirements of the National Electric Code and bears the Underwriters' label of approval. Triplex heater cord is made with the asbestos on each conductor of a different color, the three conductors tripled together and covered with a cotton or rayon braid. 'A e manufacture asbestos insulated wires and cables for every purpose. Descriptive bulletins on request. RBB 00397 HEATER CORD Heater Cord has of course the one general appli cation to appliances which produce heat in their oper ation. It's 30 easy to overlook some of these, how ever, that we're putting below a list of some of the appliances for which we have* sold the cord. Incidentally a point of interest is that in the United States we sell approximately 1/3 of the cord consumed and supply about 65# of appliance manufactur ers part or all of their cord requirements. Toasters Flat irons Percolators Table stoves Grills Sandwich toasters Egg boilers Heater pads Hair wavers Hot water bottle warmers Hilk bottle warmers Waffle irons Soldering irons Wall outlet ranges and stoves Electric fireless cookers Room heaters Immersion heaters Bacon broilers RBB 00398 ROCKBESTOS -the asbestos covered wire braiding patterns of heater cords far all types af Electrical Heating Appliances [9 A M msnmssmma* D E U * -f JLJ!>> H **111 11 ",*-"Jgaww*lflirWOTW Wp X These illustrations show the most commonly used patterns. Other combinations can be made on request. Any color combination desired can be furnished. Approved by Underwriter* Laboratories, Inc. ROCKBESTOS PRODUCTS CORPORAT I ON NEW HAVEN. -- CONN. RBB 00399 Rockbestos Heater Cord National Electric Code Type H ! Approved by Underwriters' Laboratories. Inc. Site B&S Gauge No. 14 16 17 13 Rockbestos "3000" Conductor Rockbesto* "X" Conductor No. Wires iB & S Gauge of each wire No. Wire* B&S Gauge of each wire 104 1 34 41 30 65 26 30 iI 3452 M 20 30 41 i 34 16 30 i Pound* per 1000 ft. Rayon Cotton Allowable Capacity(Amps.) 46 49 34 36 28 30 23 25 20 10 ^3 2 5 Standard packing two 500 foot coils in one carton. Can be furnished on 12' or 24' wooden reels if desired or 250 and 500 feet on fibre spools. Can also be furnished cut to any desired lengths, with or without ends stripped and tied. RBB 00400 RBB 00401 ROCKBESTOS - the asbestos covered wire FIXTURE WIRE April i, Idas RBB 00402 Rockbestos Fixture Wire CKBESTOS Fixture Wire is made for wiring all types of lighting fixtures and commercial units. It is manufactured of the best materials and the workmanship is of the highest quality. Rockbestos insulation provides maximum protection against failure from overheating, which is of common occurrence where other types of insulation are used. Rockbestos insulation will not bum and cannot communicate fire to adjacent combustible materials. It will retain its flexibility and has the necessary dielectric and mechanical strength to insure long life. It is approved by the Underwriters' Laboratories, Inc. and its use is insisted upon by Electrical Inspectors in a number of districts. The stranded conductor is thoroughly annealed copper of uniform and ex treme softness and of 98.5~e electrical conductivity, according to Matthiesen's Standard. It is carefully inspected for accuracy of dimensions. The insulation is pure long fibred asbestos thoroughly separated, carded and spun into roving which is wound uniformly upon the conductor in two coats, applied in opposite directions and then saturated with a special chemically neutral compound and compressed into a continuous wall of insulation of the proper thickness. It can be furnished both coats white or both coats black or with the inner coat black and the outer coat white or colored. When white or colored outer finish is desired we recommend that the inner coat be black to provide greater moisture resistance. Fixture wire having both coats white or colored is recommended for use under conditions of extreme heat and no moisture such as internal wiring of heating appliances, pyrometer leads, etc. For decorative purposes the asbestos insulation may be covered with a rayon or cotton braid in any desired color or combination of colors and is made in one, two, or three conductors, individually braided or under one cover. Three conductor fixture wire with a braid overall is sometimes called kitchen unit cord. To comply with the requirements of the National Electric Code for identi fication of grounded conductor, plain fixture wire with white outer coat is pro vided; for braided conductor one or more threads of contrasting colors are woven into the braid. Rockbestos fixture wire can be furnished with solid conductor and with a heavier insulating wall to suit unusual requirements. WV manufacture asbestos insulated wires and cables for every purpose. Descriptive bulletins on request. rBB 00403 Fixture Wire This article, while given a definite name has a variety of uses. A3 a fixture wire, however, it is being used in increasing quantities on fixtures where at first thought it would seem that a heat re sisting insulation would not be needed. Small fixtures particularly those equipped with gas filled lamps show surprisingly high socket temperatures which fully warrant the use of an as bestos insulated wire. See the report entitled "Lamps and their Heating Effects" at the rear of "test reports" section. Efforts are being made in several cities in this country to require the use of a "heat resist ing" wire for all lighting fixtures using lamps con suming 50 watts and over. In this respect the nation al Electric Code goes only to the extent of stating that wherever temperatures exceed 120 F. a "heat re sisting insulation" is required. The Underwriters' Laboratories requirements for approval, however, are that when temperatures exceed 194 F. "an asbestos insulated wire" is required. Considerable educational work is being done toward increasing the use of asbestos insulated fix ture wire on all fixtures and its consumption for this purpose is definitely on the increase. Other uses are: Hair waving machines Radio power units and sets (in prox imity to power and rectifying tubes (valves) which generate considerable heat.) Electric fan leads from base to motor Hinge connections in household waffle irons, sandwich toasters, etc. RBB 00404 Rockbestos Fixture Wire Construction Specifications Fixture Wire -- Plain Fixture Wire -- Rayon or Cotton braid SL;c B. & S. Gauge 10 12 14 16 ia Wall ' O. D. Stranding Thickness Plain MiU 104/30 65/30 41/30 26/30 16/30 35 32 32 32 32 .195 .160 .140 .125 .110 O. D. '* O. D. Cotton Rayon Covered Covered .215 .180 .160 .145 .130 .210 .175 .155 .140 .125 Plain Pounds per ICC0 feet Cotton Rayon 41 44 43 27 29 2S 18 20 19 12.2 14.2 13.2 8.5 10.5 9.5 Rockbestos Fixture Wire conforms to the latest specifications of the Underwriters Laboratories, Inc. and bears their approval label. Standard package 1000 foot coils. Can be furnished on fibre spools. ROCKBESTOS FIXTURE WIRE is also used in wiring of devices where permanent flexibility and heat resisting insulation is required, such as permanent waving machines, heat* ing appliances, show case lighting units, therapeutic devices, etc. Kitchen Unit Cord Kitchen Unit Cord meets the need for a safe and satisfactory three-conductor wire for kitchen units, having combination convenience outlet and switch, to which electric appliances may be attached. Finished O. D. given above in nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. RBB 00405 1 RBB 00406 ROCKBESTOS -the asbestos covered wire RANGE WIRES for wiring Electric Ranges Hot Plates Pyrometers Table Stoves Electric Ovens ........n'HrAr" ROCKBESTOS PRODUCTS CORPORAT ION NEW HAVEN. CONN. 5342 Grand Central Tern. Bide* New York 903 Clark. Bldg* Pitteburg, Pa* Terminal Bldg* Chicagn. 01* On the Pacific Ceaefc C* Dent Slaughter SnS^pSBfiBi RBB 00407 Rockbestos Range Wires ELECTRIC RANGES are coming into general use more rapidly every day, which neces sitates careful selection of materials on the part of the manufacturer. That ROCKBESTOS is used by most range manufacturers is an acknowledgment of its high quality. MISCELLANEOUS other uses for ROCKBESTOS Range Wires and Cables are listed on the cover of this bulletin. SPECIFICATIONS covering construction and testing of our All Asbestos Insulaced Wires and Cables are published in our Rockbestos W'ires and Cables Bulletin. The construction, briefly, is as follows; CONDUCTOR. May be Copper, .Monel metal. Nickel or other alloys, bare or tinned, solid or stranded. INSULATION. Is all asbestos, applied by the Rockbestos felted process, providing ample dielectric and mechanical strength. Can be impregnated with white flameproof compound which can be used where no moisture is encountered, but we strongiy recommend black impregnation which is flameproof and moisture resistant. The compound in the insulation does not affect the color of the outside braid. COVERING. A heavy asbestos braid approximately 4? mils in thickness finished with white or colored flameproof or black flameproof and moisture resistant compound. Stranded and flexible conductors can be furnished with the same insulation as specified for solid. Two or more conductors either solid or stranded can be cabled together with or without a braid over all. Where additional dielectric strength or moisture resistant qualities are desired, we can furnish a varnished cambric and asbestos insulated combination, standard construction for solid conductor being two layers of varnished cambric applied next to the conductor and then a felted wail of asbestos and an asbestos braid. For wall thicknesses, diameters and other information see following tables. For applications, requiring the smaller sizes, where there is danger of conducted heat from heating elements, etc. which might injure the varnished cambric, we can furnish the con struction with the felted wall of asbestos next to the conductor so as to insulate the varnished cambric against overheating. Allowable carrying capacities for Monel metai and nickel conductors are not defined in the National Electric Code but general practice in selecting sizes is to use a conductor two B &! S gauge sizes heavier than the necessary copper conductor. This brings about conductor temperatures higher than would be allowable for copper, but the characteristics of Monel metal and nickel conductors enable them to operate without deterioration under these con ditions. We manufacture asbestos insulated wires and cables Jar every purpose. Descriptive bulletins on request. RBB 00408 RANGE WIRE This bulletin gives the range manufac turer the information he needs about our mater ial for his requirements. The fly-leaf opposite Table I in "R.OCK BESTOS Wires and Cables" bulletin gives other uses for thi3 same product. The combination asbestos and varnished cambric insulation shown is used principally by the range maker on products destined for export where high humidity is prevalent and certain in sulation resistance tests are to be met. USES: All circuits of electric ranges, hot plates, and stationary room heaters. RBB 00409 Range Wire All Asbestos Insulation Solid Felted Asbestos Braid CCoopnpdeurctor Asbestos Siie A. W. G, <B. &S0 BARE 8 10 12 14 16 18 SOLID CONDUCTOR 600 VOLT SERVICE Bare Dis. .128 .102 .081 .064 .051 .040 Felted Wall Thickness Mils Braid Thickness Mils Appro*. O. D. Finished 35 45 .289 35 45 .262 30 45 .231 30 45 .214 25 45 .191 25 45 - .180 Pounds Standard Shipping Length (Maximum in feet) Coils Reels 75 500 1000 55 500 1500 40 1000 3000 30 1000 2500 25 1000 3000 20 1000 3000 Varnished Cambric and Asbestos Insulation Solid Varnished Felted Asbestos Braid Copper Cambric Asbestos Conductor Site A. W. G. (B. & S.) BARE Bare Dia. 8 .128 10 .102 12 .081 14 .064 16 .051 18 ,040 V. C. 2-.005' 2-.005' 2-005' 2-005' 2--.005" 2--.005' SOLID CONDUCTOR Felted Wail Thick ness Mils Braid Thick ness Mils Appro*. 0. D. Finished * Pounds per M ft. Standard Shipping Length (Maximum in feet Coils Reels 20 45 .283 75 500 20 45 .257 55 500 20 45 .236 40 1000 20 45 .219 30 1000 20 45 .206 25 1000 20 45 .195 20 1000 1000 1500 2000 2500 3000 3000 `Finished O. D. given above is nominal, A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. ' RBB 00410 RBB 00411 ROCKBESTOS - the asbestos covered wire ROCKBESTOS A. V. C. CABLES Permanently Flexible APRIL 1, 1929 RBB 00412 Rockbestos A* V* C. Cables ^HE construction of these cables has been developed especially for wiring mine locomotives and mining machines, and for circuits in and about mines or other locations where heat and moisture are encountered. The conductors are of flexible stranding made up of thoroughly annealed copper wires, tinned and laid up as shown in the table. The insulation consists first of a layer of felted asbestos applied in the form of untwisted roving, thoroughly saturated with moisture proof compound and compressed to form a compact, uniform wall of thickness shown in the table. Over this felted wall three layers of .006' thick high grade varnished cambric tape are wrapped in such a way that each layer laps about one quarter the width of the tape and the joints in the successive layers are staggered to provide maxi mum insulation resistance. Petrolatum is applied between layers of cambric to provide lubrication and moisture resistance. Over the varnished cambric another felted asbestos wall, of thickness shown, is applied in the manner described above. An outer braid of heavy asbestos yam is woven closely over the last felted layer and thoroughly impregnated with black moisture proof and flame proof compound to produce a smooth rugged finish. This construction provides an insulation of ample dielectric strength, maxi mum insulation resistance and greatest flexibility that will retain its original characteristics indefinitely. It is not affected by temperatures met in mining service, nor will it deteriorate in the presence of moisture, coal dust and oil as encountered in the operation of most mining machinery. Complete test data substantiating the above will be furnished on request. RBB 00413 Rookbestos Data Sheet #8 A.V.C. Cables Jan. 10, 1930 Insert opposite A.V.C. Cables . Bulletin ihe specially flexible stranded tinned copper cable with the A.V.C. insulation is the unique result of an interesting incident. . A large manufacturer of mining equipment - loco motives, coal cutters, etc. - had experienced consid erable trouble with insulation failures in one type of locomotives after they had been in service for a short time. They asked us if we made a cable that would per haps do away with the difficulty. At the time we made only asbestos insulated cables. One of our engineers went to the tfest Virginia coal fields where several of these locomotives in ser vice in a mine had been giving trouble and inspected the service conditions first hand. The oables in use at'the time passed through the iron housing of the motor and thus were effectively grounded. Due to coal dust, oil, moisture and heat attacking the insulation of the wires, frequent break downs occurred at this point. One experience with rubber insulated cables had been most eye opening. Sven though the cables came out from the hermetically sealed motor compartment through stuffing boxes, they-had caught fire on the inside and it had traveled along the cables through the stuffing boxes;.to the outside, thus presenting a most serious.hazard especially in a gaseous mine. It was decided that our asbestos insulated cable would servd ,if varnished cambric could be combined with it in .order to insure a continuously high insula tion resistance under the service conditions involved. The test is described in detail in the report entitled Report of Test on Mining Machine Cable" in the "test reports* section. The final design was submitted to the company {Jeffrey Manufacturing Co. - Columbus, Ohio.) tested RBB 00414 A.V.C. CA31ES continued by them and finally adopted as standard or motor lead w oric. An experience with the A.V.C. Cable fully justi fies the Jeffrey company's action in standardising on it. A short circuit oocurred in the motor compartment of a locomotive in service and a fire started. But con trary to the experience related above where the rubber insulated cables burned up, the A.V.C. Cable not only did not transmit the flame to the outside, but the flame did not even burn up to the stuffing boxes on the in side* The Jeffrey Company has just recently standard ized on A.V.C. Cable for motor leads on all equipment. Table C and insulations were, of course, adaptations of this original A.V.C. Cable design. Other uses: All electrically operated mine machinery. ' Kine locomotives Undercutters, etc. Headlight wiring where train con trol system is used. ^ RBB 00415 Construction Specifications Rockbestos A. V. C Cables Flexible Felted Varnished F>it*d CTCoionnpndpeuedcrtorbAe.s*c-o5 Cambric A.** beatoa Asbst-o* Br*id .MS' Thick Size Cond. Stranding First Felted Wall Mils v.c. Second Felted Wall Mila Finished O. * D. Pounds per M feet Standard . shipping lengths (maximum in ft-) Coils Reels 500.000 c. M. 427. 61 x 7 (.03387) 20 3 -- .006" 45 450.000 C. M. 427. 61 x 7 (.03195) 20 3 -- .006" 45 400.000 C. M. 427, 61 x 7 (.03016) 20 3 -- .006" 45 350.000 C. M. 427. 61 x 7 (.02846) 20 3 _ .006"- 45 500.000 C. M. 427. 61 x 7 (.0269) 20 3 -- .006" 45 350.000 C. M. ' 250. 57x7 (.0320) 20 3 -- .006" 45 0000 B Sc S Ga. 250. 37 x 7 (.02846) 15 3 -- .006" 25 000 259, 37x7 (.02535) 15 3 -- .006" 25 00 259. 37 x 7 (.0226) 15 3 -- .006" 25 0 259. 37 x 7 (.0201) 15 3 -- .006" 25 1 153, 19x7 (.0253) 15 3 _ .006" 25 2 133, 19 x 7 (.0226) 10 3 _ .006" 15 3 133, 19x7 (.0201) 10 3 - .006" 15 4 133. 19x7 (.0179) 10 3 _ .006" 15 5 49, 7x7 (.0253) 10 3 _ .006" 15 6 49. 7x7 (.0226) 10 3 _ .006" 15 s. 49, 7 x 7 (.0179) 10 3 -- .006" 15 10 37 /.01689 10 3 __ .006" 15 *13 65 /.010 10 3 -- .006" 15 *14 41 ,'.010 . 10 3 _ ,006" 15 1.184 1.133 1.084 1.038 .995 .941 .808 .742 .682 .637 .590 .520 .482 .450 .408 .386 .342 .298 .280 .260 1828 1636 1475 1330 1194 1049 810 657 527 441 364 282 235 192 150 123 91 65 49 39 500 500 500 1000 10C0 750 750 1000 1000 1000 KKK) soon 1500 1500 15C0 1000 1000 1000 2000 2500 2500 2500 1000 1000 1000 *Xot Tinned. `Finished O. D. given above is nominal. A tolerance of plus or minus 5 % is necessary on account of variations in process of manufacture. STOCK REEL LEN'GTHS:--Sizes No. 6 and larger, 500 Feet--Sizes No. 8 and smaller, 1000 Feet. i ! 1 ROCKBESTOS PRODUCTS CORPORATION NEW HAVEN. CONNECTICUT RBB 00416 RBB 00417 ROCKBESTOS -the asbestos covered wire SWITCHBOARD WIRES and CABLES for wiring Switchboards Elevator Control Panels Car Heating Circuits Power and Lighting Circuits Kesistance Grids Rheostats Traffic Signal Systems Electric Furnaces S'pt. 10, 1929 RBB 00418 Rockbestos Switchboard Wires and Cables SWITCHBOARDS which are wired with rubber insulated or slow burning wires are, in the opinion of leading engineers, fire hazards that should be eliminated, The additional cost of ROCKBESTOS Switchboard Wire is the cheapest kind of fire insurance. It is guar anteed not to communicate fire even if it be subjected to contact with an electric arc, MISCELLANEOUS other uses for ROCKBESTOS Switchboard Wires and Cables are lisced on the cover of this bulletin, SPECIFICATIONS covering construction and testing of our All Asbestos Insulated Wires and Cables are published in our Rockbestos Wires and Cables Bulletin. The construction, briefly, is as follows: CONDUCTOR. Copper, bare or tinned, solid or stranded. INSULATION. Is all asbestos, applied by the Rockbestos Felted process, providing ample dielectric and mechanical strength. Can be impregnated with white flameproof compound which can be used where no moisture is encountered, but we strongly recom mend black impregnation which is flameproof and moisture resistant. The compound in the insulation does not affect the color of the outside braid. COVERING. A heavy asbestos braid approximately 45 mils in thickness finished with white or colored flameproof or black flameproof and moisture resistant compound. These cables can be furnished with two or more conductors, under one cover, if desired. Where additional dielectric strength or moisture resistant qualities are desired we can insert varnished cambric in the felted wall. For wall thicknesses, diameters and other information see following tables. Standard construction on sites larger than No. 8 is a felted wall of asbestos next to the conductor, three layers of varnished cambric and another felted wall of asbestos and covered with a heavy asbestos braid. Sizes No. 8 and smaller, two layers of varnished cambric are applied next to the conductor and then a felted wall of asbestos and an asbestos braid. For applications, requiring the smaller sizes, where there is danger of conducted heat which might damage the varnished cambric, we can furnish the construction with the felted wall of asbestos next to the conductor so as to insulate the varnished cambric against over heating. On Switchboards installed in locations which would subject the wiring to high tempera tures we recommend the use of our ROCKBESTOS ail asbestos switchboard wire. For con struction specifications see Table A. On Switchboards installed in power generating plants, substations and other locations where appearance is of importance or for re-wiring or additions to existing boards that have been wired with varnished cambric insulated switchboard wire having a gray or black flame proof cotton braid we recommend the use of ROCKBESTOS varnished cambric asbestos insulated flameproof cotton braided switchboard wire. The construction of this wire is a tinned copper conductor insulated with two layers of varnished cambric, 30 mils of felted asbestos, saturated with a flameproof and moisture resisting compound, and covered with a gray or black flameproof cotton braid. The braid is closely woven and will not break or open on sharp right angle bends. It meets all the requirements as to dielectric strength, insulation resistance, appearance, uniform diameter and in addition gives the advantage of ROCKBESTOS insulation which will positively prevent the varnished cambric from igniting regardless of the amount of flame applied to it. It will continue to operate under conditions that would destroy any other type of switchboard wire. For construction specifications see Table B. Vi manufacture asbestos imutated wires ana cables for every purpose. Descriptive bulletins on request RBB 00419 table a See remarks- applying to Table 1 *ROCKBESTOJ Wires and Cables" bulletin. This is the same mater ial. table b This material was: designed: for the specif io purpose of wiring switchboards and panel boards.: Before this wire imls available- the customary practice was to use a "switchboard wire* made up with several layers (5 or 6) of varnished cambric tape over which is placed a tight cotton braid finish ed with a gray flameproof, paint. .The product of each manufacturer is approximately-the same shads.of .color. - The standard practice in wiring switchboards is to make sharp, square bends, the sharper-the bend-. the=better the appearance of the completed board. But when a sharp bend is attempted in a wire with this multi-layer cambric construction, the cracking of the braid on corners is a frequent occurrence. In making the bend the cotton braid has to atretoh around the corner. Something just has to give and if the-cambric layers beneath will not then the braid must stretch and sometimes cracks open entirely. How in ROCKBESTOS switchboard wire this trouble is done away with entirely by the use of a cushioning wall of asbestos.placed just beneath the eetton braid. - - When a sharp bend, is made the cotton, braid pulla-down on this felted wall very tightly.-on the; outside- of the bend,, the felted wall "in turn- compress es or "gives* slightly and a perfectly smooth bend 1b the result. : ... An important feature is that a .switchboard man ufacturer can save time in the.wiring of his product RBB 00420 TABLE B continued "because the wiremen do not have to be especially care ful in making bends not to crack them. And to central stations a wire like this means always a fine appearance on the completed board something they are very proud of. Along the line of fine appearance central station engineers have been interested in learning that dust will not readily collect on ROCKBBSTOS switchboard wire. This is accomplished by using a specially prepared (gassed) cotton yarn. This pro cess burns off the ''whiskers9 which are what catch the dust. Then of course there is the protection against fire hazard. A complete report entitled "Report of Tests covering the New Rockbeatos Switch board Wire" is contained in the "test reports* sec tion of this book. A part of this report is the ap proval report of the laboratory of the Associated Factory Mutual Fire Insurance Companies of Boston, Massachusetts. This is an independent laboratory maintain ed by a group of industrial fire insurance companies for the sole purpose of passing on materials enter ing into the construction of properties they insure. Safety is the only reason for their inter est in these materials. Naturally they conduct some very severe tests. Note especially paragraph II on "Tests* in their report. Consider what would have been the re sult had the usual multi-layer cambric construction switahboard wire been subjected to the same test. Other uses: . Flameproof connections for transformer vaults. RBB 00421 Rockbestos Switchboard Wire AU Asbestos Insulation -- Asbestos Braid Size A. W G. (B. Si S.) BARE 0000 000 00 0 1 2 3 4 5 6 8 10 12 14 !6 18 SCooolicdw? FAeiolteediioi Conductor Asbestos Braid Table A SOLID CONDUCTOR Bare Dia. Wall Thickness Mils '/i Md .460 .409 ,365 .325 .289 .257 .229 .204 .182 .162 .128 .102 .081 .064 .051 .040 ml < 60 g 60 60 O oO 35 Q 35 -V 5 35 it 35 Ui 35 35 tie 35 O 35 <fi V) W 30 Z 30 o 25 X 2? -- 600 VOLT SERVICE Approx. Finished # Pounds per M ft. Standard Shipping Length (Maximum in feet) Coils Reels .6/0 730 1500 .620 590 1000 .575 480 1000 .535 390 1500 .449 300 2000 .418 245 2500 .389 200 2500 .364 165 1000 .342 .322 135 110 1000 500 tooo .289 75 500 1000 .262 55 500 1500 .23! 40 1000 2000 .214 30 1000 2500 .191 25 1000 3000 .180 20 1000 3000 Varnished Cambric and Asbestos Insulation -- Flameproof Cotton Braid Solid Copper Conductor Tinned Varnished Cambric Felted Aabesto* Gray Flameproofed Cotton Braid Table B Size A. W. G. tB. Si S.) Tinned 8 10 12 14 Bare Dia, .128 .102 .081 .064 SOLID CONDUCTOR -- 600 VOLT SERVICE v. c. Felted Wall Mils Thick ness Braid Mils Approx. O. D. Finished * Pound* per M ft. Standard Shipping Length (Maximum in feet) Coils Reels 1 oO 1 30 20 .258 72 500 1000 2--.005" 30 20 .232 51 500 1500 2-.005' 30 20 .211 36 1000 2000 2-.005' 30 20 .194 27 1000 2500 *Finished 0- D. given above is nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. i RBB 00422 i I a*|j" Rockbestos Switchboard Wire Asbestos Insulation with Varnished Cambric Insert Asbestos Braid This is the construction of No, 0000 to 6 inclusive. This is the construction of No. 8 to 1$ inclusive. Table C Size A.WG. (B.ats.) Bare Bare Dia. First Felted Wall Mils 0000 000 00 0 1 1 3 4 5 6 8 10 12 14 ie> 18 .460 .409 .365 .325 .289 .257 .129 .204 .182 .162 .128 .102 .081 .064 .051 .040 15 15 15 15 15 15 15 15 15 15 V. C. 3- 005' 3- 005* 3--.005' 3-.005' 3-.005' 3-. 00 5' 3--.005' 3-.005' 3-.005' 3-,005' 2-.G05' 2-005' 2-005' 2-.005' 2-. 005' 2-.005' SOLID CONDUCTOR Second Felted Wall Mil* Approx. Standard Shipping iU 0. D. Pound* Length (Maximum in feet) Finished Per vS V M ft. Coil* Reels -a 30 < .680 740 1500 30 <3 .629 600 1000 30 30 ' .585 .545 485 395 1000 1500 30 Q .509 15 < CC .447 15 a .419 322 255 210 1500 2000 2000 15 s ,394 15 H D .372 15 o .352 20 U. o .283 20 cfl .257 20 U .236 20 i .219 175 145 115 75 55 40 30 500 500 500 1000 1000 2500 1000 1000 1000 1500 2000 2500 20 5 .206 20 h .195 25 20 1000 1000 3000 3000 *Finished 0. D. given above is nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. RBB 00423 TABL3 C The development of a moisture resisting asbes tos insulated wire was a natural step. In applying asbestos insulated wires to high temperature appli cations moisture would occasionally be encountered. For instance, asbestos insulated wire for mo tor secondary circuits in conduit in a hot boilerroom would be ideal but the conduit may pass through the boiler-room wall to a much cooler area. This may cause condensation and if the conduit is placed so that bends or loops exist at the bottoms of vertical runs there is even the chance of water pockets form ing temporarily. The Table A material with the felt ed wall impregnated with black moistureproof and flame proof compound will resist casual moisture but lying half submerged in a water pocket is a different matter. All conduits should be cleaned at the comple tion of installation and should be provided with drain plugs at low points. If, however, the placing of con duits is such that there is doubt as to their continued dryness we would recommend Table C wire or, in extreme conditions, Table S cable. Table C wire is generally used on electric ranges destined for certain export markets in order that the range, will meet certain insulation resistance require ments laid down by inspection rules in those markets. CENTRAL STATIONS AND INDUSTRIAL PLANTS Lighting circuits Control * MISCELLANEOUS Electric ranges for export Conduit wiring for industrial baking ovens Lighting and control circuits in areas where gases or corrosive fumes are present, such as in chemical manufacturing plants. Miscellaneous circuits in paper mills, around evaporators, etc. TABLE D Refer to remarks opposite Table II. This is same material. RBB 00424 Rockbestos Switchboard Cables Ail Asbestos Insulation Asbestos Braid Stranded Cooper Conductor Felted Asbestos Asbestos Braid Table D STRANDED CONDUCTOR -- 600 VOLT SERVICE Size 500.000 C. M. 450,000 C, M. 400,000 C. M. 350,000 C. M. 300,000 C. M. 250.000 C. M. 0000 B, & S, 000 00 0 1 2 3 4 5 6 8 10 12 14 Stranding Bare Bare Die. Wall Thick- Mila VUNii Sfl Vd*- Standard Shipping Pound* Length (Maximum in ft.) Finis*hed per M ft. Coils Reel* 37/. 1102 .815 120 -J 1.145 1775 750 37/.1103 .773 120 < 1.103 1610 1000 37/.1039 37/.0973 37/.090 37/.0822 .729 .681 .630 .575 120 120 2 120 120 ' 1 1.059 1.011 .960 .905 1450 1280 1115 950 1000 1000 1000 1000 19/.1055 530 19/.0940 .470 90 90 Q .800 785 .740 640 1000 1500 19/.0837 19/.0745 19/.0664 7/.0974 7/.0867 .420 .374 .332 .295 .260 90 OS a 90 90 os 90 H 60 o .690 520 .644 430 .602 350 .565 290 .470 225 1500 1500 1000 1000 1500 7/.0772 .234 7/.0688 .209 60 60 fQt .444 185 .419 150 7/.0612 .185 60 g? .395 125 7/.0486 .145 35 z .305 80 500 ' 500 2000 2500 2500 1000 7/.0385 .116 35 3 .276 55 7/.0305 .092 7/.0242 .073 30 30 XH .242 .223 40 30 500 1000 1000 1000 2000 2000 `Finished O. D. given above is nominal, A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. RBB 00425 Rockbestos Switchboard Cables Asbestos Insulation with Varnished Cambric Insert Asbestos Braid Stranded Felted Varnished Felted Copper Asbestos Cambric Asbestos Conductor Asbestos Braid Table E* Size STRANDED CONDUCTOR Strand ing Bare Bare Dia. First Felted Wall Mila v. c. Second Felted aS!d.x- Pounds Standard Shippinj5 Length Wall Mila 'Si N Fin ish*ed per {Maxitm m in ft.) M ft. Coils Reels V) 500,000 C. M. 37/.1162 450,000 C. M. 37/.1103 400,000 C. M. 37/.1039 350,000 C. M. 37/.0973 300,000 C. M. 37/.090 250,000 C. M. 37/.0822 0000 B. & S. 19/.1055 ooo 19/. 0940 00 19/. 083 7 0 19/.0745 1 19/.0664 2 7/.0974 3 7/. 0867 4 7/.0772 5 ' 7/.0688 6 7/,0612 8 7/. 0486 10 7/.0385 12 7/.0305 14 7'. 0242 .815 .773 .729 .681 .630 .575 .530 .470 .420 .374 .332 .295 .260 .234 .209 .185 .145 .116 .092 .073 30 3-005' 30 3-005' 30 3-005' 30 3-.005' 30 3-. 005' 30 3- 005' 15 3-. 005' 15 3-.005' 15 3-.005' 15 3-.005' 15 3-,005' 15 3--.005' 15 3-005' 15 3-005' 15 3-005' 15 3--.005' 15 3--.005' 15 3-.005' 15 3-.005' 15 3-.005' 45 45 45 45 45 45 30 30 30 30 30 15 15 15 15 15 15 15 15 15 < 1.095 1743 X o 1.053 1580 1.009 1417 all .961 1253 .910 1088 .855 922 .750 761 .690 616 .640 500 as .594 410 H .552 335 Q .485 265 tie .450 216 O .424 180 t<ffil .399 149 Z .375 120 500 (j .335 85 500 5 .306 62 500 H .282 47 1000 .263 37 1000 750 750 1000 1000 1000 1000 1000 1500 1500 1500 1000 1000 1000 2000 2500 2500 2500 1000 1000 1000 * Finished 0. D. given above is nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. rBB 00^26 TABLE 3 This material is generally used where con ditions prevail similar to those described in Table C. A good many firms which would probably find Table C material satisfactory make doubly sure of: obtaining continous service by standardizing on Table E cable. Ford Motor Company is one of these using it for motor leads. It will be seen by a comparison of the two tables that the smaller sizes of Table C are insulated with two tapes and a felted wall, whereas the corres ponding sizes in Table E construction have two walls and three tapes between. The larger sizes (from #1 B&S up) have heavier top walls of felted asbestos and cable of this construc tion provides the utmost protection against conditions of heat, heat and moisture, abrasive dusts such as coal dust, mineral dusts, etc., oils, gases, and so on. Where the basic condition of service is heat and any or all these other conditions are involved this is the material to recommend. Ashpit wiring gives as severe a test to wire in conduit as any application we know of. Hot ashes drawn from furnaces are dumped in the pits and water sprayed on them for rapid cooling. This causes extreme conden sation in conduits near the pit, therefore ashpit circult failures are common and expected. To correct this condition Table E material has been used with suc cess and should always be recommended for this applica tion. Some companies go so far as to specify a lead sheath, over this cable. An interesting point in selling this expensive cable Is that the first cost is of no particular im portance if the cable will do away with expensive re placement labor. Users' experience has shown that this is exactly what it does and that it becomes practically a permanent Installation. This type of cable is made for service voltages up to 7500 by increasing the number of cambric tapes RBB 00427 TABLE E continued between the felted walls. 1st. The number of tapes for the various services Service Ho, of Tapes 600 volts 1500 " 3800 " 5000 " 7500 0 3 6 9 12 18 The applications for this type of cable are gen erally the same as those shown for Table C material, the construction being approximately the 3ame except for the stranded conductor and different thickness of the insulated walls in the larger sizes. Uses: All conduit applications Mptor Leads Lighting and control circuit ashpit wiring. CAUTIOH* * Customers using any asbestos and varnished cambrio insulated cable in conduit should be cautioned about'the-kind of lubricating compound they use. A neutraL lubricating grease should be used. * TI ` There are a number of brands of lubricating grease on the market in the country which are strong ly alkaline. These greases are soluble in water and when condensation takes place in conduit it is possi ble for this grease to penetrate to the cambric and eat the varnish away, The grease, however,, has no effect on rubber in sulation. RBB 00428 Where and how Rockbestos Switchboard wires and cables are being used CENTRAL STATION SWITCHBOARD RBB 00429 RBB 00430 ROCKBESTOS - the asbestos covered wire ROCKBESTOS Wires and Cables Designed especicdly for wiring lighting circuits and all low voltage auxiliaries in Central Stations and Industrial Plants, Electric Railway motor, Transformer and Shoe leads. =0 .JUL 1! Hi EtX.;" 1 ROCKBESTOS PRODUCTS CO R P O R A T I O N N6W HAVEN. CONK 5942 Grand Ctntnl ttno. Bldg, ; Now York 903 Clark Bid#. Pittiburf, Pa. Madiaon Teminal Btdg. Chicago, 111. On th* Pacific Coaat Anaconda Wira 4c Cabla Co. S.M. 10. 1929 RBB 00431 Rockbestos Wires and Cables (JyONTINU ITY of service is of paramount importance in power plant operation, electric railway service and manufacturing establishments. Rockbestos cable is the result of many years of experimental and research work to develop cables that would insure this continuity of service under the most severe conditions, especially where heat is encountered or where communica tion of fire thru insulated conductors would prove disastrous. Rockbestos cable is rapidly being accepted as the standard for all lighting and low voltage power and control circuits in power plants. Boiler room wiring has been a constant source of trouble that has been eliminated by the use of Rockbestos cables. Our type of cable has been operating successfully installed in conduit, in power plants, electric locomotives and steel mills for a number of years, where other types of insulated cables have failed within a comparatively short time. This specification contains all of the necessary engineering information to enable you to choose the cable best adapted to your particular requirements. Where added dielectric strength and greater moisture resistant properties are i wanted, we recommend our A. V. C. type cables which are described in a sepa i rate bulletin. i General Characteristics Asbestos insulation applied by the "Rockbestos Process" will not deteriorate electrically or mechanically with age or under severe heat conditions. It will not carry flame even if it be subjected to contact with an electric arc. It will operate continuously without deterioration at any temperature up to 400 F. and will retain a large part of its electrical and mechanical strength up to the fusing point of the conductor. Permanently flexible as consistent with the stranding of the conductor. Rockbestos insulation will withstand casual moisture and will operate satisfactorily in conduit under proper conditions of installation. The outer finish will withstand abrasion incident to installing in iron conduit. Rockbestos insulation is unaffected by the fumes of most acids. A few typical applications and installations are shown in the photographs on the last page. We manufacture asbestos insulated wires and cables for every purpose. Descriptive bulletins on request 5 D RBB 00432 Standard Specification for ROCKBESTOS Asbestos Insulated Wires and Cables General: This specification provides a standard for materials, workmanship, and testing of asbestos insulated wires and cables for applications where freedom from communication of fire or deterioration by severe heat conditions is of primary importance, such as lighting circuits, switchboard wiring, primary and secondary motor leads, control circuits, rheostat wiring, resistance grids, low voltage power feeders and similar installations. 1. Copper: Bare or tinned copper shall conform to A.S.T.M. standards- 2. Insulation: The asbestos shall be pure, long fibre material, commercially free from metallic oxides, it shall be applied in the form of untwisted rovings compressed and impregnated with a neutral heat and moisture resisting compound to pro duce a continuous, uniform felted layer of thickness specified. (See Tables I, II, ill, IV, V.) The insulation shall be applied so as to provide a circular cross-section in which the conductor is well centered in the insulating wall. The impregnating compound shall be black except where extreme heat and no moisture conditions are present, in which case white compound should be used. 3. Braid: 600 Veil Service. A closely woven braid approximately .045 thick of asbestos yarn shall be applied over the felted insulation. 1500 Voft Service. An asbestos braid shall be incorporated approximately in the center of the felted wall, for the purpose of increasing the mechanical strength of the in sulation. Over the finished insulating wall a closely woven braid of 20/2 cotton shall be applied to form a tough outer covering that will resist wear and serve to protect the felted asbestos during installation. rBB 00433 4. Finish: The outer braid shall be saturated with a flameproof and moisture resisting compound. The color shall be black except where extreme heat and no moisture are encountered or where white is desirable for appearance. Other colors can be furnished for purpose of identification. The compound used shall consist of suitable high grade ingredients and shall retain its initial qualities during the life of the cable. The compound shall develop no injurious chemical action within itself or with any other of the component parts of the completed cable. It shall be of such a character that it will not drip from the completed cable at any temperature up to 500 C. 5. Tests: () Dielectric: Tests for dielectric strength of insulation shall be made between conductor and metal foil wrapped over insulation for a length of about 5 feet. The test voltage applied shall be two and one-half times the raced working potential of the wire under test and shall be held for one minute without failure. A section of material having black impregnated insulation shall be im mersed in water (except ends) for one hour and shall then withstand a test volt age of two times the rated working potential of the wire under test, applied between conductor and water, for one minute without breakdown. White impregnated insulation shall not be subjected to water test. () Bending Test : A new' section of finished cable shall be bent 360 around a mandrel 8 times the diameter of the finished cable, then straightened and bent 360 in the op posite direction around the same mandrel, after which it shall be straightened and the section which was bent wrapped with metal foil. A test voltage equal to that shown in Paragraph 5 shall then be held for one minute between conductor and foil without failure. (c) Flame Test: The wire (after seasoning) must not convey fire nor support combustion for more than one minute after five fifteen-seconds application of a standard test flame -- the period between applications of test flame being 15 seconds. The flame used is a blue flame (about 5 inches in height) obtained with a K `nch Bunsen burner fed with ordinary illuminating gas at normal pressure. Previous to the test the burner and the gas supply lines are adjusted to give a flame of the character described above. The sample is about 18 inches long and is rigidly suspended vertically, by means of a clamp attached to a ring stand, in a room from which all drafts of air are excluded. 3 0 RBB 00434 The hot part of the "tip" of the test flame (i. e. the part over the blue cone in the flame) is applied nearly parallel to the suspended sample at a point about 3 or 4 inches above its lower end. The flame is applied to the sample for 15 sec onds and then removed and after a 15 second interval (whether the flaming on the sample has ceased or not) the test flame is again applied at the same portion of the sample for 15 seconds and removed and the above operations repeated until the test flame has been applied at the same portion of the sample for five times. During the test, as well as after the fifth application of the test flame, observation is made to determine whether or not the area of the sample sup porting the flaming extends outside the area exposed to the heat of the test flame (the effect of the heat of the test flame is considered as extending an inch or so beyond the "tip" of the test flame.) Behavior and duration of flaming on the sample after the fifth application of the test flame are also noted. After the cable has cooled for five minutes the section to which the flame was applied shall be bent as in 5-b, straightened and wrapped with metal foil. The insulation shall then withstand for one minute the test voltages given in Paragraph 5 applied between conductor and foil. 6. Inspection: Testing and inspection shall be made at the place of manufacture unless otherwise noted on purchasers order. The manufacturer shall afford the in spector representing the purchaser all reasonable facilities to enable him to satisfy himself tha.t the material conforms to the requirements of these specifications. RBB 00435 Construction Specifications Rockbestos 600 Volt Solid Conductor '.'''Si-,' yvi1V, r'.' - Size A. W. G. (B. & S.) BARE 0000 000 00 0 1 2 3 4 5 6 8 10 12 14 Solid Copper Felted A*b**tos Conductor Asbestos Braid Table I SOLID CONDUCTOR Bare Diam. Wan Thickness Mils N .460 .409 .365 .325 .289 .257 .229 .204 .182 .162 .128 .102 .081 .064 < 60 60 8L. 60 60 a 35 < 35 35 X isi 35 H 35 o 35 o 35 </} </} 35 m z 30 a u 30 Jri H 600 VOLT INSULATION O. D. finished Pounds per Standard Shipping Length (Maximum in feet.) Coils Reels .670 730 1500 .620 590 1000 .575 480 1000 .535 390 1500 .449 300 2000 .418 245 2500 .389 200 2500 .364 165 1000 .342 135 1000 .322 110 500 1000 .289 75 500 1000 .262 55 500 1500 .23! 40 1000 2000 .214 30 1000 2500 Finished 0. D. given above is nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. # # 0 RBB 00436 TABES't"* - .it',. This wire. has thA greatest' number onuses of an7 wire in the line. Tt has a. large sale* to in dustrial plants and central stations f6r maintenance and permanent installations, to. manufacturers for in.- clusion in their products, and to many other classes- of users for various applications involving hig tem peratures. . While this all asbestos Insulated wire has been sold for mans conduit installations, the general recommendation should be the combination varnished oambrlc and asbestos insulation shown in tablea CL and H. If the service conditions surrounding an application are continuously applied high temperatures, an all asbestos insulated wire would be suitable. But if there is a possibility of slight moidtufe due to condensation or other causes the Table C type of mate rial should be used. If considerable moisture is likely to be encountered, the Table 3<material should be invar > iably recommended. ' C3NTRAL STATIONS AND INDUSTRIAL PLANTS Boiler Room Lighting.. Circuits Ceiling or flood lights . Wall bracket .lights. . Water column lights : Boiler-Room Control Circuits. . , .; . -- - .. Auxiliary equipment, such - ........... Oil circuit breakers to control panel" Indicating lamp, leads- to control panel Current transformer leads*' to control panel . - Boiler control to .boiler control panel Damper -control drive to control panel Limit switch connection's "for contractors to motors,, eta*. . - . . Start and stop push'button connections to contractor*,, eto. T--- -............. RBB 00437 TABLE I continued Rheostat Wiring and Connections Switchboard Wiring, (back of panel) where fire hazard exists ' IR01T AMD STEEL IUDUSTRT ' . Rheostat Wiring Lighting Circuits Crane cab resistor wiring Wiring around soaking pita * * electric furnaces UISCELLAMEOUS Electric Ranges and Hot Elates (see "Range Wire" bulletin) Elevator control panels etc. Table II This is generally used for much the same appli cation as Table I material where large size or indiv idual preference requires a stranded conductor. The second and third paragraphs under Table I on the preceeding page explain when it is desir able to make the alternate recommendation of varn ished cambric and asbestos insulated cable which al so applies to this stranded construction. BOILER R0011S Primary Rotor Leads Induced and forced draft fan motors Rotor operated steam valves Electric hoist motors Aro Welding Power Leads- IROH AMD STEEL IUDUSTRT Rotor Leads to Rotors Operating Furnace Doors RBB 00438 Construction Specifications Rockbestos 600 Volt Stranded Conductor Size Stranded Copper Conductor Felted Asbeito* Asbestos Braid Table II STRANDED CONDUCTOR Stranding Bare BARE Diam. Wall Thick- nest Mila -- 600 VOLT SERVICE O. D. Finished Standard Shipping Pounds Lengths (Maximum in ft.) Coils Reels 1,000.000 CM. 900,000 800,000 750,000 700,000 600,000 500,000 450,000 400.000 350,000 300.000 250,000 A.W.G. 0000 000 00 0 1 2 3 4 5 6 8 10 12 14 61/.1280 61/.1215 61/.1145 61/. 1109 61/.1071 61/.0992 37/. 1162 37/.1103 37/. 1039 37/0973 3 7/. 090 37/.0822 19/.1055 19/.0940 19/.0837 19/.0745 19/.0664 7/. 0974 7/.0867 7/.0772 7/.0688 7/.0612 7/.0486 7/.0385 7/.0305 7/.0242 1.152 1.093 1.031 .998 .964 .892 .815 .773 .729 .681 .630 .575 .530 .470 .420 .374 .332 .295 .260 .234 .209 .185 .145 .116 092 .073 120 120 120 120 120 120 120 120 120 120 120 120 90 90 90 90 90 90 60 60 60 60 35 35 30 30 1.482 3400 N 1.423 3075 Cfl 1.361 2750 J 1.328 2590 < 1.294 2425 % 1.222 2105 1.145 1775 1.103 1610 e> 1.059 1450 Q 1.011 1280 < .960 1115 OS OQ .905 950 u .800 785 o .740 .690 640 520 ob .644 430 ttoo (A .602 .565 350 290 aZ .470 225 .444 185 X .419 150 .395 125 500 .305 80 500 .276 55 . 500 .242 40 1000 .223 30 1000 500 500 600 600 750 750 750 1000 1000 1000 1000 1000 1000 1500 1500 1500 1000 1000 1500 2000 2500 2500 1000 1000 2000 2000 Finished 0. D. given above is nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. RBB 00439 Construction Specifications Rockbestos 1500 Volt Stranded Conductor Size Stranded Copper Conductor Petted Asbestoe Asbrnu Braid Felted .Asbestos Table III Flameproof Cotton Braid STRANDED CONDUCTOR Stranding Bare BARE Diam. Wall Thick ness Mils -- 1500 VOLT SERVICE O. D. Fin ished Standard Shipping Pounds Lengths (Maximum in ft.) per M ft. i Coils i Reels 1,000.000 C.M. 61/.1280 1.152 .187 1/1 1.586 3500 i 900,000 800,000 61/.1215 I 093 61/. 1145 1,031 .187 .187 1.527 1.465 3175 2840 750,000 61/.l 109 .998 .187 .J 1.432 2680 700,000 61/.1071 .964 .187 1.398 2515 i 600,000 61/.0992 .892 .187 a 1.326 2185 500,000 37/, 1162 .815 .187 0 & 1.249 1850 450,000 37/. 1103 .773 .187 *5 1.207 1685 400,000 37/.1039 .729 .187 9 1.163 1515 350,000 300,000 250.000 A.W.G. 3 7/.0973 37/.090 37/.0822 .681 .630 .575 .187 .187 .187 1.115 1350 G5CSQ 1.064 1.009 1180 1010 0 0N 0000 19/.1055 .530 .187 U) .964 000 19/.0940 .470 .187 3 .904 725 0 00 19/.0837 .420 .187 .854 600 0 19/.0745 .374 .187 <3 .808 505 1 19/.0664 .332 .187 .766 425 2 7,1.0974 .295 .187 % .729 360 3 7/.0867 .260 .157 .634 280 4 71.0771 .234 .157 0 .608 240 5 7/.0688 .209 .157 s .583 205 6 7/.0612 .185 .157 .559 180 8 7/.0486 .145 .157 .519 135 10 7/.0385 .116 .157 .490 no 12 7/.0305 .092 .157 .466 90 14 7/.0242 .073 .157 .447 80 400 400 500 500 500 600 750 750 750 750 1000 1000 1000 1000 1000 1000 1000 1500 1500 1000 1000 1000 1500 1500 1500 2000 Finished O. D. given above is nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. O o RBB 00440 TABLE III See Table V for remarks which apply here as well. This is the same material with a coarse stranded conductor. RBB 00441 't *1 TABLE IV Certain variations of the applications men tioned under Table I and II require a flexible strand ed conductor. Motor leads on large motors are an ex ample. By motor leads in this case is meant the leads extending from the coils inside the frame, out through bushings for a 3hort distance ready for connections to line wires. Asbestos insulated motor lead cables may be used on a motor for several reasons. They should be used if the location of the motor is in a high tem perature area in order that there shall be no deteri oration of the leads as would be the case if rubber in sulated leads were used. Steel mill motors, motors on auxiliary equipment in boiler rooms, etc. come in under this classification. The above treats on the desirability of using an asbestos insulated as against a rubber insulated motor lead. In general the recommendation for motor leads for all applications would be a lead insulated with a combina tion of varnished cambric and asbestos. This is shown in the *A.V.C. Cables* bulletin and in Table E of the "Switchboard Wires and Cables* bulletin. A large motor may be engaged in such duty that it is heavily overloaded at intermittent periods. An elevator motor, for instance, or a mill motor on process work, draws a tremendous overload current at the start of its operation. This sometimes causes conductor heat ing, Continued recurrence of this heating vulcanizes rubber insulation so that it becomes brittle and cracks. To guard against this' development an asbestos insulated cable should be used because this heating has no effect whatever on it and the insulation stays permanently flex ible which is a distinct advantage. . . Many central stations and industrial plants have used' thousands of feet of similiar materal for motor lead application as they realize that it provides a permanent installation. . Insulated cable of this construction is used on subway, cars. Where the cable attaches to- a connection RBB 00442 cr- TABLE-IV continued point a lug is used, sweated to the cable and bolt ed to the connection* The constant motion and vibration .of cars frequently loosens the cable from the lugs. Some times a high resistance joint is.set up, overheat ing takes place and arcing begins. An asbestos in sulation will successfully confine fire to the point of origin so that adjacent inflammable material will not be set afire. It Is a common experience for a cable to break under load perhaps at the lug* An arc forms immediately and continues until the cable falla away or until the copper melts and increases the gap thus stopping the arc. ' To be warranted in using asbestos insulated motor lead cables for these cars the traction compan ies must be assured that they will not transmit flame or fire and that they really will not burn themselves.. An interesting report entitled "Aro Flame Tests on Motor Lead Cables" is contained in the . , "test reports" section of this book and clearly shows the performance of asbestos insulated cabla as com pared with the rubber insulated type of cable. Other uses; Inside motor connections Arc welding power leads Headlight wiring where the train, control system is not used* -----* Where the train control system is installed, it is customary to feed all circuits from one genera tor. For this reason every circuit on the locomotive should be wired with the same- kind of insulated wire so that the dielectric strength of all parts of the wiring system will be the same. (See last paragraph under the page entitled Cab Cord.) ' Our recommendation for train control system wiring is the varnished cambric and asbestos insula tion shown in the "A.V.C. Cable" bulletin or Table B of the "Switchboard Wires and Cables* bulletin. RBB 00443 Construction Specifications Rockbestos 600 Volt Flexible Conductor Flexible Tinned Copper Conductor Felted Asbe*to* Asbestos Braid Table TV FLEXIBLE STRANDING Wall Thick Size Stranding Bate ness Tinned Diam* Mil* 500,000C.M. 427-61x7(.0338) 450,000 427-61x7(0310) 400,000 427-61x7( 0301) 350,000 427-6lx7(.0284) 300,000 427-6lx7(.0269) 250,000 259-37x7(.0320) A.W.G. 0000 259-37x7(.0284) 000 259-37x7( 0253) 00 259-37x7( 0226) 0 259-37x7(.020t) 1 133-19x7(0253) 2 133-19x7(0226) 3 133-19x7(0201) 4 133-19x7(0179) 5 49- 7x7( 0253) 6 49- 7x7(0226) 8 49- 7x7(0179) 10 37/ 01689 12 37/01339 14 37/0106 .914 .863 .814 .768 725 .671 .598 .532 .474 .422 .380 .339 .302 .269 .228 .203 .161 .118 .094 .074 , 120 120 120 120 120 90 90 90 90 90 90 60 60 60 60 35 35 30 30 -- 600 VOLT SERVICE Standard Shipping O. D. Pounds Length (Maximum in ft.) Fin- per V) ished M ft. til Coils Reels N tA 1.244 1850 < 1.193 1655 a 1.144. 1500 2 1.098 1350 1.055 1215 3 1.001 1060 750 750 750 1000 1000 1000 < .868 830 06 a .802 675 .744 550 06 at .692 460 b* .650 380 o .609 310 ti* 0 .512 240 .479 200 Vws) til .438 160 1 .413 130 .321 85 x .278 60 .244 41 .224 32 500 500 500 1000 1000 1000 1000 1500 1500 1500 1000 1500 1500 2000 2500 1000 1000 2000 2000 Finished O. D. given above is nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. RBB 00444 Construction Specifications Rockbestos 1500 Volt Flexible Conductor Felted Asbesto* Flameproof Cotton Braid Table V FLEXIBLE STRANDING 1500 VOLT SERVICE Wall Standard Shipping Thick- O. D. Pounds Length (Maximum in ft.) Size Stranding Bare ness Fin- per Tinned Uianit Mila ished M ft. iNll Coils Reels r 500.000C.M. 427-61x7( 0338) 914 187 1.348 1930 ! 600 450,000 427-61x7( 031<9) 863 187 < 1.297 1735 | 750 400.000 350,000 427--61x7( 0301) .814 427-61.<7(0284) .768 187 187 ao 1.248 1575 1.202 1425 | 750 750 300,000 427-61 x7(0269) .725 187 1.159 1285 750 250.000 259-37x7(0320) .67! 187 o 1.105 1125 1000 A.W.G. 0000 000 259-37x7(0284) .598 259-37x7(0253) .532 187 187 < 1.032 925 .966 765 i 1000 j 1000 00 259-37x7(0226) .474 187 .908 630 1000 0 259-37x7(0201) .422 187 lil .856 540 1 133-19x7(0253) .380 187 H .814 455 2 133-19x7(0226) .339 187 o 773 390 ! 1000 ! 1000 1000 3 133-19x7(0201) .302 157 Li- .676 300 1500 4 5 133-19x7(0179) .269 49- 7x7(0253) .228 157 157 5A V) .643 255 .602 210 1500 1000 6 49- 7x7(0226) .203 157 z .577 185 8 49- 7x7(0179) .161 157 X u .535 140 10 12 37/.01689 .118 37/.01339 .094 157 157 5 H .492 110 .468 90 1000 1500 1500 1500 14 37/.0106 .074 157 .448 80 2000 Finished 0. D. given above is nominal. A tolerance of plus or minus 5% is necessary on account of variations in process of manufacture. r, RBB 00445 TABLE 7 This is a special 1500 volt service asbestos insulated cable designed for electric locomotive ap plication. In such an application it is constantly subject to abrasion so it is equipped with a tough cotton braid which is finished with flameproof com-) pound. ' This construction of insulation, however, is being superseded by that shown in Table E, Switch board Wires and Cables bulletin, which is now made for service up to 7500 volts by using from 3 to 18 layers of cambric tape, sandwiched between the walls of felted asbestos. Where and how Rockbestos wires and cables are being used RESISTANCE GRID ' FIELD RHEOSTAT HEAVY DUTY RESISTOR RBB 00447 nrrsauMi*: R&SKBESTOS PRODUCTS C"0 * R O R A T O H htAWyrACTOH**** OF ASBESTOS COVERED WIRES AND CABLES MICQU AMO CANNCM STMCfT* NEW HAVEN. CONN. CMtGAOO'- ROCEBBSTOS INDUSTRIAL WIRES AND CABLES There are certain quite well established pre judices existing against any kind of a wire covered or insulated only with asbestos. Probably the major part of this prejudice was caused by the discouraging exper iences of engineers with the earlier types of asbestos covered wire typified by "double braid asbestos cover ed" wire. This statement applies more particularly to wires and cables used for industrial and central sta tion applications. Wires of this variety could be used in conduit but the slightest bit of moisture in the conduit caused grounds resulting in failure. The insulation value of this type of asbestos covering is principally the space factor. There is no resistance to moisture because the braid is open and because the individual yarns cannot be impregnated. For this reason we have stressed the fact in our advertising, sales literature, direct mail and sales letters that our material is "asbestos insulated" as opposed to "covered" although the word "covered." still remain#^* part: of our original slogan. _____ hygroscopic characteristic of asbestos fibe^Hfgenerally known among engineers but the advanceifthat have been made during the past few years in the production of wires and cables insulated with as bestos and so impregnated as to resist moisture are not generally known. ROCEBKSTOS trade paper advertis ing, direct mail and general sales work aims to acquaint engineers the country over with these advances as they are represented in ROCEBESTOS wire products. RBB 00449 -3- BULLETINS Following this section is a complete set of bulletins. Our experience has taught us that individual bulletins are much more efficient and less confusing In furnishing information. . This is particularly true with our business be cause in many industries only one wire of our line can be used. Consequently when answering inquiries from such a field of prospects a single bulletin is sent which fully covers the case but which does not contain irrelevant in formation to detract attention from the main question. It will be noticed that there are some duplica tions between bulletins. The previous paragraph explains this. An illustration is Table I in the "Switchboard Wires and Cables" bulletin and the first table in the "Range Wires" bulletin both of which show the same wire. The first named bulletin Is generally sent to fuel burn ing central generating stations and the Table I wire has a large number of uses in such a place; boiler room light ing and control circuits, rheostat wiring, primary and secondary motor lead wiring and so on. A full range of sizes is shown in Table I. The "Range Wire* bulletin shows the same thing but tactile restricted range of size3 generally used by electrih-range manufacturers. All the information that is needed by these manufacturers i3 shown and none that is not. USES OF ASBESTOS INSULATED WIRES AND CABLES Opposite each table and illustration is a fly page listing a variety of uses for that particular type of material. RBB 00450 *1