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MWBC Issue

Merry Christmas

ESolar

Senior Member
Location
Eureka, CA Humboldt County
Occupation
Electrician/Contractor
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!)
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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.
 

ESolar

Senior Member
Location
Eureka, CA Humboldt County
Occupation
Electrician/Contractor
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

Senior Member
Location
Eureka, CA Humboldt County
Occupation
Electrician/Contractor
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

Senior Member
Location
Kent, WA
Occupation
Retired Engineer
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

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
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.
 
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