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