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Old 03-06-2011, 01:10 PM   #1
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Bathroom circuit help

Roughing in wiring for two simple guest bathrooms that are back to back

each bathroom has :

(1) duplex outlet
(3) recessed lights
(1) vent fan

What would be the best way to wire this? I was originally thinking of combining the duplex and vent fan of each bathroom on its own 20A and combine the recessed lighting of both bathrooms on a single 20A using 12/2, total of 3 circuits for both bathrooms. (I know you can run 15A 14/2 for lighting, but I prefer 20A 12/2 for everything)

NEC seems to want the duplex on its own 20A however, but then im not sure what to do with the vent fans. It seems I would need two circuits for each bathroom then, which sounds a little overkill.



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Old 03-06-2011, 01:20 PM   #2
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Two circuits is enough. One 20 amp for each bath. As long as the circuit does not leave the bath and is not overloaded with a heater you can put ALL the stuff in the bath on the one circuit.


You could put the receptacles from both baths on one 20 amp circuit. Only the receptacles are permitted to be on the circuit. The other stuff can be on any other circuit available except a few like the kitchen small appliance circuits. Only the receptacles need to be 20 amp. The lights, fan etc can be a 15 amp circuit.

I would choose option 1 and use two 20 amp circuits.


Last edited by joed; 03-06-2011 at 01:23 PM.
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Old 03-06-2011, 01:21 PM   #3
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You'll have to gave two circuits no matter what. You'll be more than adequate to have one 20A GFI circuit for the bathrooms' receptacles. Then one 20A circuit for the lights/fans. It'll save you on buying two different wires. Depending on your code cycle, you might need to have to put the lights/fans on a AFCI breaker.

Last edited by iminaquagmire; 03-06-2011 at 01:24 PM.
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Old 03-06-2011, 01:24 PM   #4
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Each bathroom can have its own circuit (and feed no other outlets outside of that bath)...lights, fan & receptacle, as long as nothing fastened in place draws more than 50% of the circuit, or you can have 1 circuit for the recepts only, and another for the lights/fans. No heaters in these fan units? If not, personally I'd homerun 12/2 to the recepts, and 14/2 to the lights/fans. 2 circuits...both baths...done.

Just because you can, doesn't always mean you should
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