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Old 10-04-2010, 03:25 PM   #1
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GFCI Issues


Having an issue attempting to replace a regular receptacle with a GFCI type. On a 20-Amp circuit running into the kitchen I have 2 receptacles and a single-pole switch which controls one of the receptacles (the garbage disposal is plugged into the switch-controlled receptacle).

I am attempting to replace the non-switch controlled receptacle with a GFCI. I made sure I had a 20-Amp GFCI. After installing the receptacle and restoring power to the circuit, (switch turned OFF) the GFCI functioned normally. When I flipped the switch to the other receptacle (powering the garbage disposal) the GFCI tripped. I swapped the GFCI back out with a standard receptacle and the circuit functions as normal.

I'm new to DYI electrical work, so I don't know why the GFCI would trip when the disposal was powered on. Does anyone have any ideas?
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Old 10-04-2010, 03:26 PM   #2
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Is the disposal on a dedicated circuit or the same circuit as the receptacles?
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Old 10-04-2010, 03:29 PM   #3
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Quote:
Originally Posted by Jim Port View Post
Is the disposal on a dedicated circuit or the same circuit as the receptacles?
Same circuit. The disposal is plugged into the switch controlled receptacle.
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Old 10-04-2010, 03:48 PM   #4
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assuming the disposal switched outlet is fed from the load terminals of the gfi; if the disposal is unplugged and you turn on the switch does the gfi trip?

if no, I would suspect a ground fault in the disposal (tiny, not a dead short)
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Old 10-04-2010, 03:55 PM   #5
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IT sounds like you wired the feed for the disposal switch "downstream" from the GFI unit. The neutral conductors may be separately wire-nutted thus creating an imbalance when attempting to operate the disposal unit.

Be sure to ONLY use the "line" terminals on the GFI receptacle when connecting it into the middle of a circuit like this.

That should solve your dilemma.
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Old 10-07-2010, 05:01 PM   #6
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Are garbage disposal receptacles required to be gfi protected since they within six feet of a sink?
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Old 10-07-2010, 05:09 PM   #7
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Quote:
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Are garbage disposal receptacles required to be gfi protected since they within six feet of a sink?
No, as they are under the sink.
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