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I am slightly renovating 2 bathrooms. I am adding 2 exhaust…

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I am slightly renovating 2...
I am slightly renovating 2 bathrooms. I am adding 2 exhaust fans - each pulls approx. 2 amps - and 4 overhead/vanity lights.

I have a 30amp breaker with # XXXXX wire not being used in my box. It is terminated in a junction box in my attic.

I would like to come off the junction box (#10) in the attic with 2 - #12's to 2 junction boxs near each of the 2 bathrooms - approx 15 feet. I would then run 14/2 to each of the fans and lights.

Is this a good plan or bad plan?
Submitted: 8 years ago.Category: Electrical
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Answered in 4 minutes by:
6/29/2010
Electrician: Mike G., Master Electrician replied 8 years ago
Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 8,427
Experience: Proven Professional 49 years Experience
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Hi, I'm Mike and I'll be glad to assist you.

1) Is the 30A breaker 120V or 240V?
2) Is the #10 - 2 or 3 wire w/ grd?
3) Are you going to also wire in a GFCI receptacle in each bath?
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Customer reply replied 8 years ago
The 30 amp breaker is a double and was supplying a 240v water heater. It has a black and white #10 wire attached.

The breaker appears like it can be "Un-doubled" or what ever the correct term is - so that it can be used as 2 30 amp breakers.

I plan on "Un-doubling" the breaker, removing the white wire and placing it with the other commons on the common bar. I will do nothing with the other side of the breaker.

The wire is romex with 2 conductors and a ground.

Each bath currently has GFCI's. just adding fans and lights.
Electrician: Mike G., Master Electrician replied 8 years ago
OK, let's proceed,

4) The circuit will need to have over current protection not exceeding 15 Amps. Using the 14/2 is the determining factor. Remove the 2 pole 30Amp breaker and install a 15A single pole for the circuit.

5) Move the white #10 to the neutral bar.

6) forget the use of 12/2. It doesn't need to any larger than 14/2.
Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 8,427
Experience: Proven Professional 49 years Experience
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Customer reply replied 8 years ago
It's not a good idea to hook up a #10 to a 15 amp breaker is it? Everything I've been taught says no.2

I would like to make each of the baths home runs back to the box with 15amp breakers, but getting new wires into the box is almost impossible.

Electrician: Mike G., Master Electrician replied 8 years ago
You only have one 120V circuit in 10/2 cable. The fact that you're going to use it for that precludes its use for two circuits. You can fuse the 10 wire for 15 Amps. You just can't have 14/2 on a 30A circuit.
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