A switch that is explosionproof or flameproof, or that controls any explosionproof or flameproof equipment must have a pole for each ungrounded conductor.
46 C.F.R. §111.105-19
A switch that is explosionproof or flameproof, or that controls any explosionproof or flameproof equipment must have a pole for each ungrounded conductor.
46 C.F.R. §111.105-19