INSTALLATION OF SWITCHES


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INSTALLATION OF SWITCHES
INSTALLATION OF SWITCHES39. A switch or a circuit breaker must not be installed so that it will disconnect a grounded conductor of a circuit unless the switching mechanism simultaneously disconnects all wires of the circuit, or is so arranged that the grounded conductor cannot be disconnected until the ungrounded conductor or conductors have first been disconnected.40. Three-way and four-way switches are in reality single-pole switches and therefore must be installed so that all switching is done only in the ungrounded conductor. When the wiring for these switches is enclosed in a metal enclosure, the wiring must be so installed that at every point the same enclosure includes wires of both polarities. Stand…
Citation
Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. INSTALLATION OF SWITCHES, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export