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Old 04-02-2014, 10:58 AM   #1
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Wiring Bath fan/light combination w/dual switch question


I have bath fan light combo (NO heater) I plan on running a new circuit for this device and put it on a leviton dual multi switch one to control fan one to control the light . The device does not specify that it needs to be on a 20 amp circuit. My understanding would be that it could be on a 15 amp service. My plan was to run 14-2 wire from the panel to the switch from the switch a 14-3 wire to the fan/light all on a 15 amp breaker seems simple enough.

Before starting I have read the instrucitons for the Leviton Decora 15 Amp Single Pole Dual Switch (15 Amp 120 Volt/Device Total: 20 Amp 120 Volt. Dual Rocker Switche) I bought. It has a warning that only #12 wire should be used as the common wire.

My question is am I ok to wire it they way I previously intended. Do I just run 12-2 wire form panel to the switch then carry on with the 14-3 wire to fan/light all on a 15 amp breaker. Or is it smartest to run a 20 amp circuit with 12-2 wire and 12-3 wire.

Im located in Alberta Canada.

I would really appreciate your feedback.

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Old 04-02-2014, 11:35 AM   #2
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Wiring Bath fan/light combination w/dual switch question


Since this is switching a single circuit I cannot see why the instructions call for an upsized common.

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Old 04-02-2014, 11:49 AM   #3
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Wiring Bath fan/light combination w/dual switch question


Not sure if this will help as maybe Im missing something but I have attached a copy of the instructions. Look at Step 3 installing the swich and the warning right under it.

Thanks
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File Type: pdf Leviton switch warning.pdf (43.4 KB, 26 views)
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Old 04-02-2014, 12:24 PM   #4
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Wiring Bath fan/light combination w/dual switch question


Just splice a short piece of #12 to the incoming black #14.
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Old 04-02-2014, 03:26 PM   #5
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Wiring Bath fan/light combination w/dual switch question


I have to run the wire anyway is there any benefit to running 20 amp circuit with 12-2 and 12-3
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Old 04-02-2014, 04:25 PM   #6
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Wiring Bath fan/light combination w/dual switch question


If it is just for the fan light there is no advantage since the 15 amp circuit is more than enough capacity.
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Old 04-02-2014, 04:59 PM   #7
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Wiring Bath fan/light combination w/dual switch question


Great thanks for the help. I suppose putting in 12 guage wire would be throwing away money.
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Old 04-02-2014, 08:39 PM   #8
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Wiring Bath fan/light combination w/dual switch question


Quote:
Originally Posted by zappsnap View Post
Great thanks for the help. I suppose putting in 12 guage wire would be throwing away money.
As would running a dedicated circuit just for this. Is there any particular reason why you think this needs it's own branch circuit?
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Old 04-02-2014, 09:13 PM   #9
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Wiring Bath fan/light combination w/dual switch question


Quote:
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As would running a dedicated circuit just for this. Is there any particular reason why you think this needs it's own branch circuit?
My thoughts exactly.
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Old 04-02-2014, 09:16 PM   #10
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Quote:
Originally Posted by zappsnap View Post
Not sure if this will help as maybe Im missing something but I have attached a copy of the instructions. Look at Step 3 installing the swich and the warning right under it.

Thanks
I'm not one for ignoring manufacturers instructions, but I'd ignore this idiocy like it wasn't there.
In one place they tell you you should use only #12 for the "common", in the other it says the quick wire will only accept #14 (but that #12 must use the screws). WHY bother allowing #14 at all in this case?
**Edit: I did just notice where it says "Common terminal must be side wired." Doesn't change my opinion at all.

IMO this is nothing more than a CYA move that some clueless lawyer had added to the text.

Also, it says you "should" use #12, not that you must. That right there is an out IMO.

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Last edited by Speedy Petey; 04-02-2014 at 09:19 PM.
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