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Old 12-05-2019, 08:12 PM   #1
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DC ground to GFCI?

I am wiring in a tiny DC fan for the composting toilet. I would like to do this without any new holes, so it could be restored to traditional toilet; take the 12v from the bathroom light switch and connect the negative side to the GFCI outlet ground wire. Is there any reason this cannot/should not be done?
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Old 12-05-2019, 08:21 PM   #2
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Thatís a big fat NO. You can ground to anything metal like the chassis.
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Old 12-05-2019, 09:09 PM   #3
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The bathroom light must have a 12volt ground, use that.
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Old 12-05-2019, 09:18 PM   #4
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The bathroom light must have a 12volt ground, use that.
Sure. At the light fixture !
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Old 12-06-2019, 12:17 AM   #5
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Thatís a big fat NO.....
Please explain why. The ground for the AC circuits, including the GFCI, is bonded to the chassis, right? Is it a code thing, a safety issue or will it disrupt the GFI function?
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Old 12-06-2019, 12:25 AM   #6
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I can snake a ground from somewhere, it just doesn’t make sense to run another wire if there is already a ground at the convenient location of the 12v power (provided it is safe to do so). Please explain.
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Old 12-06-2019, 04:34 AM   #7
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The ground in 120 volt wiring is a non current carrying, safety conductor.

Electricity being what it is, if a appliance developes a short to ground, that 120 volt current is looking for a way to ground. You don't want it taking a shortcut thru your light gauge, 12 volt wiring, behind your toilet.
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Old 12-06-2019, 06:33 AM   #8
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Just to reiterate what has been said above, it is always a terrible idea to mix 120v grounds and 12 volt grounds. They do not work the same way and create not only safety issues but fire hazards. And yes they both go to the chassis but its what happens before it gets there that can be the issue.
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Old 12-07-2019, 10:34 PM   #9
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The ground in 120 volt wiring is a non current carrying, safety conductor.

Electricity being what it is, if a appliance developes a short to ground, that 120 volt current is looking for a way to ground. You don't want it taking a shortcut thru your light gauge, 12 volt wiring, behind your toilet.

I don't think the 120VAC system is grounded to the RV chassis, as they are bonded together in the main breaker panel.Such chassis grounding can create what is called a "hot skin" if anything is amiss. Is that correct?
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Old 12-07-2019, 10:55 PM   #10
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I am wiring in a tiny DC fan for the composting toilet. I would like to do this without any new holes, so it could be restored to traditional toilet; take the 12v from the bathroom light switch and connect the negative side to the GFCI outlet ground wire. Is there any reason this cannot/should not be done?
Lay the tools down. Step back away from the tools PLEASE!!!!
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Old 12-07-2019, 11:34 PM   #11
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CAVIE: How about helping out here instead of being so sanctimonious.
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Old 12-08-2019, 12:16 AM   #12
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I don't think the 120VAC system is grounded to the RV chassis, as they are bonded together in the main breaker panel.Such chassis grounding can create what is called a "hot skin" if anything is amiss. Is that correct?
The 120 volt system is ABSOLUTLY Bonded to the chassis. If it wasn't and the skin became hot then you would become the grounding wire. OUCH! The neutral is isolated from the grounds. They are bonded together only at the main service panel.

The "hot skin" is eliminated by the bonding of the chassis.
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Old 12-08-2019, 12:41 AM   #13
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Thank you! I learned something.
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Old 12-08-2019, 02:13 AM   #14
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Lay the tools down. Step back away from the tools PLEASE!!!!
A little late for that. Iíve already installed a transfer switch, inverter, shunt for battery monitor and solar, but thanks for your concern and input. I was looking for the specifics of ďwhy/why not?Ē and I appreciate those who clarified.
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