Document 2NadRjoQ1Nd4vDkdw57KzQVq7

46--Safety Engineering Tables TABLE 46-F MAXIMUM BRIGHTNESS RATIOS Environmental Clarification A BC Between task and adiacent darker surroundings Between tasks and adiacent lighter surroundings Between tasks and more remote darker surfaces Between tasks and more remote lighter surfaces Between luminaires (or windows, skylights, etc ) and surfaces adiacent to them Anywhere within normal field of view 3 to 1 1 to 3 10 to 1 1 to 10 20 to 1 40 to 1 3 to 1 1 to 3 20 to 1 1 to 20 * 5 to 1 1 to 5 * * * 'Brightness Ratio control not practical A-tntenor Areas where reflectances of entire space can be controlled in line with recommendations for optimum see ing conditions B-Areas where reflectances of immediate work area can be controlled but control of remote surroundings is limited C-Areas (indoor and outdoor) where it is completely impractical to control reflectances and difficult to alter environ mental conditions Note From the normal view point bnghtness ratios of areas of appreciable size in industnal areas should not exceed those in the above table From American National Standard All 1--1973, Practice for Industrial Lighting, Illuminating Engineering Society TABLE 46-G LEVELS OF ILLUMINATION RECOMMENDED FOR SAMPLE OCCUPATIONAL TASKS Area Foot-candles Area Foot-candles Assembly--rough, easy seeing Assembly--medium Building construction--general Electrical equipment, testing Elevators Garages--repair areas Garages--traffic areas Inspection, ordinary Inspection, highly difficult Loading platforms Machine shops--medium work 30 Materials--loading, trucking 20 100 Offices--general areas* 100 10 rafting rooms--detailed* 200 100 Corndors 20 20 Paint dipping, spraying 50 100 Service spaces--wash rooms, etc 30 20 Sheet metal--presses, shears 50 50 Storage rooms--inactive 5 200 Storage rooms--active, medium 20 20 Welding--general 50 100 Woodworking--rough sawing 30 From A132 1--1973, Office Lighting, published by the Illuminating Engineering Society Others from ANSI All 1-- 1973 See explanation on page 1449 1456