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Old 02-21-2019, 08:34 PM   #1
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Bathroom Lighting Wiring Diagram


Hello all,
I am in the process of re-wiring the electrical for my bathroom renovation. I have attached a wiring diagram of how I believe I should be doing it but I wanted to post it and have someone double check me.
This is a re-wire so there are a couple of things already in place:
The 14-3 is already run from the box to the fan / light.
The 14-2 for the hot in and out is already there.

Please let me know if there are any questions.
Any assistance is appreciated.
Thank you,
Nate
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Old 02-21-2019, 09:09 PM   #2
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Re: Bathroom Lighting Wiring Diagram


Code requires that GFCI receptacle be on a 20a circuit.
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Old 02-22-2019, 05:27 AM   #3
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Re: Bathroom Lighting Wiring Diagram


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Code requires that GFCI receptacle be on a 20a circuit.
+1, also you show supply in and out. The supply to a bath for receptacle and lights cannot feed anything else.

Sent from my RCT6213W22 using Tapatalk
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Old 02-22-2019, 07:20 AM   #4
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Re: Bathroom Lighting Wiring Diagram


Add your location. In Canada that would be fine. Not so in USA as stated above.
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Old 02-22-2019, 07:39 AM   #5
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Re: Bathroom Lighting Wiring Diagram


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Add your location. In Canada that would be fine. Not so in USA as stated above.
So they would have to rewire everything back to the breaker to add a GFCI in the US.
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Old 02-22-2019, 08:08 AM   #6
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Re: Bathroom Lighting Wiring Diagram


OK, so the is all very helpful / not helpful. This is an old house so I understand the existing wiring is not up to current code. (and yes, I am in the US) I am not trying to turn this into a whole house re-wire, that is something I will address later.

Lets assume for the moment that this is a 20amp dedicated circuit.
Is the wiring diagram correct?

Thank you
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Old 02-22-2019, 08:24 AM   #7
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Re: Bathroom Lighting Wiring Diagram


What does the Hot Out go to?

Dan
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Old 02-22-2019, 08:32 AM   #8
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Re: Bathroom Lighting Wiring Diagram


Dan,
I believe it feeds the laundry room next to it. After that I do not know, I have not traced it out to see.
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Old 02-22-2019, 08:57 AM   #9
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Re: Bathroom Lighting Wiring Diagram


Quote:
Is the wiring diagram correct?
Yes, the wiring diagram is correct.

Quote:
Lets assume for the moment that this is a 20amp dedicated circuit.
You cannot assume that, Surely you know which breaker controls this circuit. If that breaker is 15 amps then your wiring would be correct but not code compliant. Code requires a 20 amp circuit serve bath outlets and that circuit can only serve that bath or another bath only. That is because people use hair driers which draw a lot of current. If the circuit served other rooms you could over load the circuit and trip the breaker. That would be an annoyance but not unsafe. If the breaker is a 20 amps you must use 12 gauge wire not 14 gauge wire. Using 14 gauge wire on a 20 amp breaker is unsafe.

So if the breaker is 20 amps and you use 12 gauge wire and the "out" you show is another bathroom then you are code compliant. If the "out" you show is another room then you are not code compliant but not unsafe.

Check the breaker if it is 20 amps use 12 gauge wire.
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Old 02-22-2019, 09:07 AM   #10
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Re: Bathroom Lighting Wiring Diagram


Quote:
Originally Posted by nato41 View Post
OK, so the is all very helpful / not helpful. This is an old house so I understand the existing wiring is not up to current code. (and yes, I am in the US) I am not trying to turn this into a whole house re-wire, that is something I will address later.

Lets assume for the moment that this is a 20amp dedicated circuit.
Is the wiring diagram correct?

Thank you

Electrically it will work. Logistically, you're better off running a 2-wire to the vanity light from the switch location, and a 3-wire to the fan / light. If by feed out to laundry you mean lights, the circuit is typical and even compliant today sans the GFCI receptacle.
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Old 02-22-2019, 09:12 AM   #11
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Re: Bathroom Lighting Wiring Diagram


Thank you Harold!
Everything you said makes total sense.
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Old 02-22-2019, 09:55 AM   #12
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Re: Bathroom Lighting Wiring Diagram


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So they would have to rewire everything back to the breaker to add a GFCI in the US.
No. they would just need to add a 20 amp line for the receptacle. Once the receptacle is off the circuit all the rest is fine.
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Old 02-23-2019, 08:14 AM   #13
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Re: Bathroom Lighting Wiring Diagram


Quote:
Originally Posted by rjniles View Post
+1, also you show supply in and out. The supply to a bath for receptacle and lights cannot feed anything else.

Sent from my RCT6213W22 using Tapatalk

How long has this been code?

My home was built in 2017 and I don't think wired to meet this code. I do have 20A circuits throughout the home but not separate circuits to each bathroom.
  1. How does grandfathering work with this code?
  2. Does it apply to new construction only or do you have to meet this code in a bathroom remodel?
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Old 02-23-2019, 08:37 AM   #14
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Re: Bathroom Lighting Wiring Diagram


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Originally Posted by Photobug View Post
How long has this been code?

My home was built in 2017 and I don't think wired to meet this code. I do have 20A circuits throughout the home but not separate circuits to each bathroom.
  1. How does grandfathering work with this code?
  2. Does it apply to new construction only or do you have to meet this code in a bathroom remodel?
I will paraphrase the code:

A bathroom must have a 20 amp GFCI protected receptacle circuit. If the 20 amp circuit supplies only that bath, it may also serve any lights and/or fans in that bath. If the 20 amp circuit only supplies receptacles in may serve multiple baths. The 20 amp receptacle circuit may not serve any thing out side of the bath(s).

This has been code for may NEC cycles (many years). It applies to all new construction and any permitted bath remodel.
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Old 02-23-2019, 08:46 AM   #15
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Re: Bathroom Lighting Wiring Diagram


I can't help with code but have a couple of suggestions on bathroom wiring.

Put separate switches for the vanity lights from the overhead bathroom light. I don't want vanity brightness in the bathroom when I am not needing to look in the mirror.

I have a digital timer on the fan light combo. If you need a fan it can be clicked on to run for 1,5,15,20,30 minutes. It allows you to put the fan on for a preset time after a shower to insure the moisture is removed but the fan does not stay on all day. This switch also has a permanent light blue glow that acts like a night light.

https://www.amazon.com/Enerlites-Tim...5&s=hi&sr=1-29
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