- (1) All lighting in compressed air chambers shall be by electricity only. Wherever practicable there shall be two independent lighting systems with independent sources of supply.
- (2) The exterior of all lamp sockets shall be entirely nonmetallic.
- (3) All portable incandescent lamps used shall be guarded by a wire cage large enough to enclose both lamp and socket.
- (4) All incandescent lamps shall be so placed that they cannot come in contact with any combustible material.
- (5) Only heavy insulated or armored wire shall be used for light or power.
[ 1941 c 194 s 3; Rem. Supp. 1941 s 7666-11.]