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.