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Old 10-16-2019, 10:37 AM   #1
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20A Double wall switch for bathroom


The bathroom was previously wired up having one 14/2 wire going to a single gang, double wall switch. One switch was for general lighting, the second for the vent fan.

While updating this bathroom, I ran a new, dedicated 20 amp circuit for the bathroom vent fan to support a future heater/fan combo unit in the future. I like the current switch setup - single gang box, double wall switch, one switch lighting, and one switch fan. I expected to be able to walk into HD and find a 20A rated double wall switch, but there are none.

HD has two Leviton double switches on their site for order and listed with a 20A rating, commercial grade. I can't imagine this scenario is THAT uncommon to have almost zero selection.

Summary
Bathroom update
Single gang outlet box
Need two switches
1 switch for the 14/2 wire for bathroom lighting
1 switch for the 12/2 wire for dedicated heater/vent fan unit

What's the proper switch to use here? All of the double switches I can find at HD are 15A rated.
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Old 10-16-2019, 11:06 AM   #2
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Re: 20A Double wall switch for bathroom


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Originally Posted by dtbingle View Post
I ran a new, dedicated 20 amp circuit for the bathroom vent fan
to support a future heater/fan combo unit in the future.
You'll need (want) to add a THIRD switch when you add the heat.

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What's the proper switch to use here?
For the HEAT... I'd suggest a timer of some sort and a different extra j-box.
The current switch's and set up is fine for the light and fan.
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Old 10-16-2019, 11:50 AM   #3
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Re: 20A Double wall switch for bathroom


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Originally Posted by TarheelTerp View Post
You'll need (want) to add a THIRD switch when you add the heat.

For the HEAT... I'd suggest a timer of some sort and a different extra j-box.
The current switch's and set up is fine for the light and fan.
Adding the third switch or a separate box if a heater/vent combo is put in makes sense.

But how do you get around the issue of 20 amp breaker, 12/2 dedicated wire for current vent only fan, in a single gang box with a double wall switch?

I suppose I could swap the 20 amp breaker with a 15 amp breaker and just use normal 15A rated double wall switch. Then if it's ever upgrade to a heater/fan combo, the 20A breaker could be put back in and install another outlet box for heat/fan functions.
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Old 10-16-2019, 12:01 PM   #4
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Re: 20A Double wall switch for bathroom


Go to an electrical supply house, not a big box. They should have what you are looking for.
Or look on Amazon. Here is an example.
https://www.amazon.com/Leviton-5334-.../dp/B0033PSGC8
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Old 10-16-2019, 01:06 PM   #5
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Re: 20A Double wall switch for bathroom


You don't need a 20 amp switch. You can use a 15 amp switch on a 20 amp circuit.

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Old 10-17-2019, 01:45 PM   #6
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Re: 20A Double wall switch for bathroom


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Originally Posted by rjniles View Post
You don't need a 20 amp switch. You can use a 15 amp switch on a 20 amp circuit.

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This is what I was suspecting. NEC 210.21(B)(3) discusses how you can use 15A receptacles on 20A circuits. Had trouble finding where it discusses 15A switches on 20A circuits.

From various forum posts, my understanding is that the switch is sized for its load. For example, in my case, it's a 20A breaker with 12g wire to supply power for bathroom vent fan. This bathroom vent fan specifies 14g or larger wire. This means my switch only needs to be rated for 15A since the load only requires this - EVEN though 12g wire is used from breaker to switch and from switch to vent fan.

Even if the bathroom vent fan was upgraded to a bigger heater/vent/light combo unit that calls for a dedicated 12g/20A circuit, the 15A switches would still suffice because most of the double/triple wall switches are rated for 20A total, 15A each switch. So the 1400/1500W heater runs to one switch, exhaust fan to another switch, and the light to the third switch - all falling within the 15A limit per switch.

Does this sound correct?
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Old 10-17-2019, 01:55 PM   #7
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Re: 20A Double wall switch for bathroom


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Originally Posted by dtbingle View Post
This is what I was suspecting. NEC 210.21(B)(3) discusses how you can use 15A receptacles on 20A circuits. Had trouble finding where it discusses 15A switches on 20A circuits.

From various forum posts, my understanding is that the switch is sized for its load. For example, in my case, it's a 20A breaker with 12g wire to supply power for bathroom vent fan. This bathroom vent fan specifies 14g or larger wire. This means my switch only needs to be rated for 15A since the load only requires this - EVEN though 12g wire is used from breaker to switch and from switch to vent fan.

Even if the bathroom vent fan was upgraded to a bigger heater/vent/light combo unit that calls for a dedicated 12g/20A circuit, the 15A switches would still suffice because most of the double/triple wall switches are rated for 20A total, 15A each switch. So the 1400/1500W heater runs to one switch, exhaust fan to another switch, and the light to the third switch - all falling within the 15A limit per switch.

Does this sound correct?

That's exactly correct.
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Old 10-17-2019, 05:44 PM   #8
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Re: 20A Double wall switch for bathroom


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Originally Posted by LawnGuyLandSparky View Post
That's exactly correct.



I found this, if some one want to check it.
Article 404.14(F) Cord- and Plug-Connected Loads.
Where a snap switch or control device is used to control cord- and plug-connected equipment on a general-purpose branch circuit, each snap switch or control device controlling receptacle outlets or cord connectors that are supplied by permanently connected cord pendants shall be rated at not less than the rating of the maximum permitted ampere rating or setting of the overcurrent device protecting the receptacles or cord connectors, as provided in 210.21(B).
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Old 10-17-2019, 06:03 PM   #9
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Re: 20A Double wall switch for bathroom


Here is a 3 function 20 amp switch by Broan - nutone.

https://www.homedepot.com/p/Broan-Nu...-66V/202919959
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Old 10-17-2019, 09:43 PM   #10
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Re: 20A Double wall switch for bathroom


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I found this, if some one want to check it.
Article 404.14(F) Cord- and Plug-Connected Loads.
Where a snap switch or control device is used to control cord- and plug-connected equipment on a general-purpose branch circuit, each snap switch or control device controlling receptacle outlets or cord connectors that are supplied by permanently connected cord pendants shall be rated at not less than the rating of the maximum permitted ampere rating or setting of the overcurrent device protecting the receptacles or cord connectors, as provided in 210.21(B).

A bathroom HVL is not a cord and plug connected load.
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Old 10-17-2019, 09:53 PM   #11
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Re: 20A Double wall switch for bathroom


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Originally Posted by LawnGuyLandSparky View Post
A bathroom HVL is not a cord and plug connected load.

I read more about that switch and it does say 15, 15 and 5 amps,
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Old 10-18-2019, 12:58 AM   #12
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Re: 20A Double wall switch for bathroom


Came with house.

If you find out more about these please post. I would like a new cover.
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Old 10-18-2019, 04:26 AM   #13
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Re: 20A Double wall switch for bathroom


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Originally Posted by slipparee View Post
If you find out more about these please post.
I would like a new cover.
Not a problem. Here's a link to some

Last edited by TarheelTerp; 10-18-2019 at 04:30 AM.
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Old 10-18-2019, 07:04 AM   #14
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Re: 20A Double wall switch for bathroom


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Originally Posted by slipparee View Post
Came with house.

If you find out more about these please post. I would like a new cover.
They are known as Despard switches.
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