46 C.F.R. § 154.1015
Lighting in gas-dangerous space
(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.