MWBC Issue

[ESolar]

I believe that this accurately represents the circuit as wired. Had an inspection fail today. Plugs show as correctly wired with tester. However, when the GFCI is tripped by the tester the plug shows hot ground reverse (after tripping). In addition, the dead front GFCI will continually click if the ground fault test button on the tester remains depressed. Any thoughts on the issue here? (other than SBAC should be SABC!)

 

[zbang]

How does it look if the GFCI is tripped by the test button? That's the official way of testing it. Is there anything plugged in when you do this test? If so, unplug it and try again.

I'll assume you've checked that all the neutral connect to the correct terminals.

 

[Dennis Alwon]

I believe the first thing I would do is change out the dead front and see if you get the same results

 

[ESolar]

How does it look if the GFCI is tripped by the test button? That's the official way of testing it. Is there anything plugged in when you do this test? If so, unplug it and try again.

I'll assume you've checked that all the neutral connect to the correct terminals.

The test button trips the GFCI. Then it reads "hot ground reverse" (after tripping). I will check on the neutrals.

 

[ESolar]

I believe the first thing I would do is change out the dead front and see if you get the same results

So the circuit design raises no red flags. If so, its the deadfront, or a wiring problem.

 

[infinity]

So the circuit design raises no red flags. If so, its the deadfront, or a wiring problem.

Wired per the diagram it's fine.

 

[Dennis Alwon]

So the circuit design raises no red flags. If so, its the deadfront, or a wiring problem.

The diagram is good but something is amiss. Walk thru it and see if you can isolate the problem.

 

[ESolar]

The diagram is good but something is amiss. Walk thru it and see if you can isolate the problem.

And actually, that GFCI is downstream of a CAFCI breaker in the box for the MWBC. It was added so that it trips locally and can be reset locally. That part appears to be working (i.e., GFCI outlet trips first). But on site and I just checked - the wires are still hot after GFCI trips. Time to take it apart. Probably faulty GFCI. Thanks.

 

[suemarkp]

Don't have hot and neutral on the wrong sides of the GFCI do you? Hot-ground reverse typically shows up when the neutral is broken.

 

[infinity]

Don't have hot and neutral on the wrong sides of the GFCI do you? Hot-ground reverse typically shows up when the neutral is broken.

I didn't think that a modern GFCI device can work with the hot and neutral reversed.

 

[tthh]

I didn't think that a modern GFCI device can work with the hot and neutral reversed.

early 2000's as I recall

 

[Little Bill]

I didn't think that a modern GFCI device can work with the hot and neutral reversed.

I think they will. They won't set/work with line/load reversed.

 

[Gene B]

GFCI receptacles disconnect both hot and neutral.

 

[ESolar]

Thank you everyone. It was a bad GFCI - continuity between line and load when tripped. Very unusual.