Stumped

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cawireman

Member
Location
Reno, NV
Occupation
Contractor
Sea Nile said:
Just looking at this from a theory/fundamentals understanding, without the aid of years of experience, I would suggest that the issue has to be on the downstream side of the GFCI.

Not discounting the years experience of other members; It seems like it's irrelevent what is happening up stream because the GFCI will only trip if the ungrounded conducter and the grounded conductor do not balance.

I would suggest looking for a hidden connection of the neutral of the GFCI's circuit with a different circuit Downstream of the GFCI, or a neutral ground connection Downstream of the GFCI.

But first replace the GFCI with a new one to rule out a faulty GFCI

Or it could be that the GFCI is doing its job and there is an appliance that is faulting
Click to expand...
Checked all neutral connections. Not connected to any other circuits neutral.
 
A

Amps

Electrical Contractor
Location
New Jersey
Occupation
Electrical, Security, Networks and Everything Else.
Did you try disconnecting the load wires and then letting the furnace start?
 
C

cawireman

Member
Location
Reno, NV
Occupation
Contractor
Thank you for all the input. I can not keep track of this. It is all over the place too difficult to figure out what is new.
 
R

ramsy

Roger Ruhle dba NoFixNoPay
Location
LA basin, CA
Occupation
Service Electrician 2020 NEC
See my answer link below, Leviton's AGTR-2 may solve 2 problems.

Thought I understood GFCIs ...

... but maybe I don't. A GFCI outlet is right next to the switch for the sink garbage disposal. An appliance (e.g. toaster) plugged into the outlet works at all times, including when the Test button is pressed in and the outlet is not reset. The disposal only works when the outlet is reset...
forums.mikeholt.com
 
Little Bill

Little Bill

Moderator
Staff member
Location
Tennessee NEC:2017
Occupation
Semi-Retired Electrician
cawireman said:
Thank you for all the input. I can not keep track of this. It is all over the place too difficult to figure out what is new.
Click to expand...
Are you talking about what posts are new? Or are you talking about what devices are new in a house?
If the former, anything past the last post you read is new.

Also @cawireman
what type of contractor are you?
 
kwired

kwired

Electron manager
Location
NE Nebraska
hillbilly1 said:
Mistap is where they tied the load neutral to another circuit neutral, or the load hot to another neutral that is not from the gfci. The lightning strike is just an example of a non load side trip. It is not what is happening in the op’s post.
Click to expand...
GFCI's have an injection circuit that injects a signal on the load side conductors, the intent is to detect neutral to ground faults and make it trip. What happens is when load side neutral faults to anything grounded, even if no normal circuit current is flowing this injected signal will flow through main bonding jumper or even back to the grounding at the source if that is all there is for a path, back through the supply side neutral to complete a circuit. Enough current will flow unbalancing the GFCI sensing coil and will make it trip same way other tripping occurs.

This feature will also trip the GFCI if the load side hot conductor would fault to another hot conductor of same potential - no high fault current but still an undesirable current path is developed.
 
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