I have a lab that has a 120V 20A DC receptacle, non-nema twist lock, near a sink. If I where to replace this receptacle, would it require GFCI protection? If so, where is this requirement in NEC?
A GFCI will not work on DC for two reasons:
1. DC does not work on a CT circuit, it will work on s DC sensor circuit
2. DC is not always grounded if it is it generally is center grounded and it will not look like a ground fault. This takes specialized equipment/circuits.
There is no specific requirement in NFPA 70 for ground fault protection for personnel or equipment on DC circuits like you describe. You haven't told us if that circuit is grounded at any point. It's likely that the equipment to provide ground fault protection in that circuit is not commercially available, so other means of protection of personnel should be provided.
You mention "a sink", yet nothing about the source.
Do you have any idea what any of this means? I'm wondering about article 100, 110 violations. You should not "replace this receptacle".
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