An attempt was made to clarify when a neutral is required at a switch. (A) Three-Way and Four-Way Switches. Wiring for 3-way and 4-way switching must be done so that only the ungrounded conductors are switched. Author’s Comment: In other words, the neutral conductor must not be switched. The white insulated conductor within a cable assembly can be used for single-pole, 3-way, or 4-way switch loops if it’s permanently re-identified to indicate its use as an ungrounded ...

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