Document NER4nEzKe6nXrqaM4mLOxDmVy

are listed m Table 15-B Also see p 1449 Employees should not face windows, un shielded lamps, or other sources of glare In direct, shielded fluorescent lamps are particu larly desirable to produce high levels of illumination without glare Walls and other surfaces should conserve contributing causes of office accidents Some of these are direct glare, reflected glare from the work and harsh shadows, all of which hamper seeing Excessive visual fatigue itself may be an element leading toward accidents Accidents may also be prompted by the delayed eye TABLE 15-B LEVELS OF ILLUMINATION Currently Recommended Illumination0 Footcandles OFFICES Cartography, designing, detailed drafting 200 Accounting, auditing, tabulating, bookkeeping, business machine operation, reading poor reproductions, rough layout drafting 150 Regular office work, reading good reproduc tions, reading or transcribing handwriting in hard pencil or on poor paper, active filing, index references, mail sorting 100 Reading or transcribing handwriting in ink or medium pencil on good quality paper, inter mittent filing 70 Reading high contrast or well-printed material, tasks and areas not involving critical or pro longed seeing such as confernng, interview ing, inactive files, and washrooms 30 Corridors, elevators, escalators, stairways 20 (or not less than Vs level in adja cent areas) * Minimum on task at any time From Illuminating Engineering Society light, while avoiding annoying reflections If offices depend largely on daylight, em ployees engaged in the visual tasks should be located near windows North light is pre ferred by draftsmen and artists Ceiling walls and floor act as secondary large area light sources and if finished with the recommended reflectances, will increase the utilization of light and reduce shadows Some accidents may be attributed to poor illumination However, many less-tangible factors associated with poor illumination are adaption a person experiences when moving from bnght surroundings into dark ones and vice versa Some accidents which are at tributed to the individual's "carelessness" can be traced to difficulty in seeing, from one or more of these mentioned causes Illumination evaluation. As a uniform means of evaluation, a standard procedure, entitled "How to Make a Lighting Survey" has been developed m cooperation with the U S Public Health Service (This Appendix is not 355