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The sewage ejector system in our basement is on a GFCI outlet that is on the same circuit as the adjacent bathroom (fan, light and switch).

Someone told me it needs a dedicated circuit. Does the NEC require this? I think it makes sense to share the bathroom circuit. If the pump's breaker trips then how would I know? If the lights are off I'm not going to flush the toilet.

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It all depends on several things.

What size is the circuit? What else is one it? What do the manufacturer's instructions say?

Typically you'd only need a dedicated circuit for something like this if it is big enough to warrant it, or if the mfg requires it.

When I say big enough I mean 50% of the circuit size since you are combining a fixed in place appliance (the pump) with general use items.

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