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(a) All tunnels, shafts, and general underground work areas shall be illuminated by an electric lighting system or natural light, equivalent to at least five-foot-candles intensity and ten-foot-candles at the heading area.
(b) In completed areas of tunnels where occasional work is conducted, the invert or walking surface shall be illuminated to at least two (2) foot-candles.
(c) All switches, transformers, telephone stations, hoist landings, car passers and similar areas shall be illuminated to at least five (5) foot-candles.
EXCEPTION: Tunnel repair jobs of short duration or tunnels 8 feet or less in diameter and less than 1,000 feet in length may use electric cap lamps, or equivalent, provided the illuminating device is worn by all persons going underground.
(d) Each person underground shall have a portable hand light or cap lamp available for emergency use unless natural light or emergency lighting systems are adequate for escape.
NOTE: Authority cited: Sections 142.3 and 7997, Labor Code. Reference: Sections 142.3 and 7997, Labor Code.
1. Amendment of section and new Note filed 3-5-96; operative 4-4-96 (Register 96, No. 10).