30A Circuit With A 15A Branch? - Electrical - DIY Chatroom Home Improvement Forum

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Old 02-11-2011, 06:57 PM   #1
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30A circuit with a 15A branch?

here's the situation:
my master bath,which is being remodeled,is going to have this electric heater stuck in one corner. (that bathroom is mighty cold when taking a shower) this is no ordinary electric heater, it has no heating element but rather uses a couple special Sylvania light tubes to heat copper so it doesn't pull lots of current.
the question is about wiring a receptacle for it. this new receptacle,which I'll install in the wall right by the heater,will be used for nothing else. I can fish a piece of Romex right down to the storage room underneath where a 30A circuit is brought in to power the whirlpool tub. (which is hardly ever used)
can I simply add a branch circuit to that 30A circuit using #14 romex?should the outlet be GFCI? (I imagine it would have to be,right?)




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Old 02-11-2011, 07:02 PM   #2
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No, you can not use 14ga wire on a 30 amp circuit.


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Old 02-11-2011, 08:46 PM   #3
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Regardless of the usage of the whirlpool tub it must stay a dedicated circuit.

You cannot protect the #14 using the 30 amp breaker.

All 120 volt bathroom receptacles require GFI protection.
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 02-11-2011, 10:33 PM   #4
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Sounds like your gonna have to run a dedicated circuit to the heater from the panel , if it's 30 amps you'll need 3 wire #10 to feed it .
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