§ 27.11. General.
(a) Places requiring light. Working or traversed spaces in buildings or grounds and all working places in establishments or on their premises during the time of use, shall be supplied with light in accordance with this chapter.
(b) Measurements. The location at which the principal illumination is required is expressed in this chapter as at the work. Measurement of the illumination shall be made at this location in the usual plane in which the work is done; that is, on the horizontal, vertical or intermediate plane, as the case may be.
(c) Method of measurement. For the purpose of light measurements, a standardized photometer shall be used and the measurements shall be made at such locations specified in Tables I and II of this chapter.
(d) Maintenance. Equipment for both natural and artificial lighting shall be maintained in a clean and safe condition at all times.
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