A switch that is explosionproof or flameproof, or that controls any explosionproof or flameproof equipment must have a pole for each ungrounded conductor. [USCG-2020-0075, 88 FR 16366, Mar. 16, 2023]
TL;DR
A switch that is explosionproof or flameproof, or that controls any explosionproof or flameproof equipment must have a pole for each ungrounded conductor.
Section 111.105-19 — full text
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