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-   -   Converting 15 Amp circuit to 30 Amp (http://www.diychatroom.com/f18/converting-15-amp-circuit-30-amp-33139/)

Greytguy 12-04-2008 08:58 AM

Converting 15 Amp circuit to 30 Amp
 
I want to replace a standard bathroom vent fan with one that has a heat lamp. This involves upgrading the circuit from 15 to 30 Amps.

What is involved in doing that?

joed 12-04-2008 09:00 AM

Start from the beginning. Nothing on the 15 circuit can used over.
Use #10 wire and a 30 amp breaker.

rgsgww 12-04-2008 11:02 AM

Have to run new wire, run 10 awg.

Greytguy 12-04-2008 11:20 AM

I was afraid of that- not nearly as easy a project as I hoped!

Thanks.

Speedy Petey 12-04-2008 12:41 PM

Quote:

Originally Posted by Greytguy (Post 193662)
I want to replace a standard bathroom vent fan with one that has a heat lamp. This involves upgrading the circuit from 15 to 30 Amps.

There is NO WAY this heat lamp will require a 30A circuit.
Who told you it would?

theatretch85 12-04-2008 12:49 PM

Quote:

Originally Posted by Speedy Petey (Post 193757)
There is NO WAY this heat lamp will require a 30A circuit.
Who told you it would?

I was wondering the same thing. It would have to be an actual heater (not just a screw in heat lamp). How many watts does this heater/heat lamp use?

Greytguy 12-04-2008 12:53 PM

Quote:

Originally Posted by Speedy Petey (Post 193757)
There is NO WAY this heat lamp will require a 30A circuit.
Who told you it would?

I was in a hardware store looking at combo fan/heat lamp units and the box of the model I was interested in appeared to indicate that it required 30A.

I am really weak in the area of electrical work. Could I have read it wrong? If there are units out there that will run on 15A that would be great- then I am back in the DIY realm.

Greytguy 12-04-2008 12:59 PM

Just did some more searching on the web and I found a Nutone with a 1500 watt heat element and 100 watt (max) bulb and 70CFM fan (Model 665RP) that only requires 12.5A

Problem may be solved....

Gigs 12-04-2008 01:22 PM

Quote:

Originally Posted by Greytguy (Post 193772)
Just did some more searching on the web and I found a Nutone with a 1500 watt heat element and 100 watt (max) bulb and 70CFM fan (Model 665RP) that only requires 12.5A

Problem may be solved....

This is not possible, they lied. :)

12.5 A is 1500 watts, leaving nothing for the motor or light.

However, it is believable that all that is under 15 amps, just barely. Only do that if there's nothing else on that 15 amp circuit or you'll get breaker trips randomly.

Greytguy 12-04-2008 01:54 PM

Quote:

Originally Posted by Gigs (Post 193783)
This is not possible, they lied. :)

12.5 A is 1500 watts, leaving nothing for the motor or light.

However, it is believable that all that is under 15 amps, just barely. Only do that if there's nothing else on that 15 amp circuit or you'll get breaker trips randomly.

1500W figure came from a 3rd party website. Nutone installation guide says the heat coil is 1300W. With a 100W bulb max, total is 12.5A.

Speedy Petey 12-04-2008 02:25 PM

I have to say, pretty much every one of those heat/fan/light units I have installed required a dedicated circuit. Some 15A, some 20A.

rgsgww 12-04-2008 03:05 PM

You might need to pull a new line, depends on what feeds your fan.

jerryh3 12-04-2008 03:16 PM

If you want the 3 functions to operate independantly, you're going to have to pull a new feed from the switch to the light. You'll need four conductors(plus ground) from the switch to the unit.


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