Wiring a switch, light first


  #1  
Old 12-14-13, 10:09 AM
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Wiring a switch, light first

I've run 12/2 wire to a 20 amp gfi (line side) in a new basement bathroom, then run wire to vanity fixture from gfi load terminals. The gfi shows red when I test and reset.

Wiring at light fixture:
- white (source) to white (light)
- black (source) to white (switch) marked as hot
- black (switch) to black (light)
- ground wires pigtailed to box

Wiring at switch (15A Leviton Switch and Guidelight):
- white (marked as hot) to hot terminal
- black to neutral terminal
- ground wire to ground terminal
- load terminal not being used

Have I wired this incorrectly? Tried switching terminals for white and black at the switch but no success.
 
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Old 12-14-13, 12:44 PM
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I've seen GFI receptacles with and without lights, some red - some green, some the light comes on when tripped - some the light is on if it's ok. So the light means very little. It's operation should be covered in your installation instructions.

When you press the reset button in.... does it lock in ?
If it does.... it's working ok. If it doesn't.... it's tripping.
If it's tripping it may be your switch/guide light causing the problem.
Do you have a Leviton part number of that unit.

On edit:
I missed this on the first time thru. Your Leviton switch and light combo requires 120vac power and neutral. You ran a switch leg to the switch but it requires a neutral.

Basically the power should have gone to the switch first and then to the light.

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Last edited by PJmax; 12-14-13 at 01:02 PM. Reason: reread OP's post
  #3  
Old 12-14-13, 03:25 PM
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Thanks for figuring that out so quickly!! If I replace it with a simple 2-connector switch and run power into the bottom of the switch and out through the top then I should be good to go?
 
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Old 12-14-13, 04:35 PM
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Yes... a standard single pole switch should work fine.
 
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Old 12-14-13, 04:47 PM
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Awesome, thanks much PJmax!!
 
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Old 12-15-13, 07:00 AM
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For what it's worth, typically bathroom lights aren't on the GFI load side. If the GFI receptacle trips the person will be in darkness... maybe an unsafe situation. Vanity lights aren't code-required to be GFI protected.

(Note that this is NEC based, your local codes may vary)
 
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Old 12-16-13, 06:29 AM
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That makes total sense, I'll research the code here on that and will use your suggestion when I re-wire the circuit as per PJmax's (extremely helpful) diagram.
Thanks guys!
 
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Old 12-16-13, 09:50 AM
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For my own education, is it okay to run 14-2 from the GFI plug to the switch/light considering the plug is fed by 12-2?
 
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Old 12-16-13, 10:40 AM
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No...the circuit was started on 12-2 with a 20A breaker so all wiring connected to that circuit must be #12 wire also.
 
 

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