Four Wire Timer With Neutral

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Old 12-29-11, 05:55 PM
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Four Wire Timer With Neutral

I'm installing a timer for the bathroom fan. It seems that there is only a 12-2 coming into the switch box. The timer has a black, blue, white and green. I tied the switch black to the black and the switch blue to the white then the switch ground and the switch white to the ground. I suppose it is ok everything works as it should. Does anyone see a problem with this setup?

I wired up another timer but that switch box had 2 ...12-2 wires in it. One coming in from the power and then the other running up to the fan. I tied the switch black to the hot black the switch blue to the black going up to the fan then the whites together and the grounds together. This setup seemed to be the way to go. Not sure about the previous set up.

Thanks George
 
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Old 12-30-11, 04:54 AM
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Sounds like power comes in at the bath fan and they used both the black and white (probably not recoded) for the hot.

The way you set it up, you are using the ground as the neutral. You should really pull a 12-3 from the fan to the switch. Using the ground to carry your neutral is not a good thing. The ground is there incase of an equipment failure (hot wire touching metal frame).
 
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Old 12-30-11, 06:50 AM
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The one install is on a switch loop. Both the black and white are hots. Your wiring is incorrect. The bare ground should not be carrying neutral current.

The other setup with the two cables is correct.
 
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Old 12-30-11, 03:50 PM
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I guess I will put a switch back in there and take out the timer. I don't know exactly how to wire it up correctly, rather be safe than sorry.
 
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