(a) Each gas-dangerous space that has lighting fixtures must have at least two branch circuits for lighting.
(b) Each switch and each overcurrent protective device for any lighting circuit that is in a gas-dangerous space must open each conductor of the circuit simultaneously.
(c) Each switch and each overcurrent protective device for lighting in a gas-dangerous space must be in a gas-safe space.
source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.
cite as: 46 CFR 154.1015