A new rule requires electronic switch manufacturers to use a neutral for return current, not the equipment grounding conductor. 404.22 Electronic Lighting Switches Effective January 1, 2020, electronic lighting control switches must be listed to not introduce current on the equipment grounding conductor during normal operation (Fig. 13). Exception: Electronic lighting control switches that put current on the equipment grounding conductor [404.2(C) Ex] must be listed and marked for use ...

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