Document O3Lo2rDnB7ZEJ64mrJY0Jqz8X

ELECTRICAL HAZARDS be changed by a locksmith and two new keys cut for it In case of combination locks, only the im mediate supervisor, or whoever determines the company's or department's safety policy, should have a copy of the combination To make lockout systems operable, the purchasing department should be requested to buy either equipment with built-m lock ing devices or equipment designed for the insertion of padlocks In plants where older equipment is in use, or where explosionproof or dust-tight equipment is installed, it may be necessary for the maintenance de partment to construct attachments to which locks can be applied For example, special tongues to hold several locks, common hasps to cover operating buttons, and sliding-rod devices which can be extended and locked in position to prevent operation of control han dles can be devised No matter what method of locking elec tric switches "off" is used, effective control can be maintained only by constant super vision and by training maintenance men in the safe routine Following is a lockout procedure which is generally acceptable 1 Alert the operator 2 Before starting work on an engine or motor, line shaft or other power trans mission equipment, or power-dnven ma chine, make sure it cannot be set m mo tion without your permission 3. Place your own padlock on the control switch, lever, or valve, even though some one has locked the control before you You will not be protected unless you put your own padlock on 0 4 If no padlock is available, place a MAN AT WORK sign at the control and block the mechanism in some effective manner Make sure that both sign and blocking are fastened securely so that they cannot be easily removed 5 When through working at the end of your shift, remove your own padlock, or your own sign and blocking Never per mit someone else to remove it for you, and be sure you are not exposing another person to danger by removing your pad lock or sign 6 If you lose the key to your padlock, re port the loss immediately to your super visor and get a new padlock Removing fuses When it is necessary to remove a fuse, the operating switch should be opened to re move the load and the fuse should be ex tracted with an insulated fuse puller If the fuse is not protected with a switch, the sup ply end of the fuse should be pulled out first When the fuse is replaced, the supply end should be put in first It is important that a fuse be replaced by one of the same type and size and that a copper wire or other conductor never be substituted For work on lines carrying 440 volts and over, the sources of energy can be opened by tripping the circuit breaker and then opening the disconnects The conductors should be tagged, and, if possible, a substan tial grounded conductor should be clamped to each leg of the circuit before the work is started The grounding conductors should be removed just before the circuit is re energized As an added precaution, tests should be made with a voltmeter or other standard approved tester to make sure the circuit is clear. In emergencies where the areas around fuse boxes are wet, wood platforms, insu lated stools, or rubber boots should be used by maintenance workers. Wiring Electrical installations should be made in accordance with the national Electrical Code, and each job should be properly in spected The use of temporary wiring should be discouraged even though it may be rea sonably safe when first put m As a job progresses and repairs or installations are made, temporary wiring may become un safe because it is not properly protected from mechanical iniury Maintenance r.en should make it a prac tice to inspect plugs anjjl connections on portable electric equipment and to see that the third wire frame ground is properly connected Where there is any doubt about the safe operation of a tool, it should be re moved from service, tagged, and returned to the tool room for repairs Extension cords should be well insulated, the sockets made of insulated material, and the lamps protected against breakage When using extension cords, workers should string them so that they will not trip either 91-25