Gfci

[laketime]

I have two circuits that are sharing a neutral (single phase service). Both circuits first recep is a GFCI. When I turn one circuit on everything is fine, when I turn the second one on the GFI trips on both receps. Any ideas?

 

[mcclary's electrical]

I have two circuits that are sharing a neutral (single phase service). Both circuits first recep is a GFCI. When I turn one circuit on everything is fine, when I turn the second one on the GFI trips on both receps. Any ideas?

Do the neutrals split on the line side or load side?

 

[infinity]

Something is wired incorrectly. The neutral should be spliced and tailed off to the line side of each device.

 

[laketime]

I was thinking about that. The neutral from the panel goes to the first GfI on the line side and then all the rest of the outlets neutrals are fed from the load side of the gfi, even the next gfi. All connected with one conduit and only one neutral is pulled through the entire run. Do I need a separate neutral to feed the second gfi?

 

[Dennis Alwon]

I was thinking about that. The neutral from the panel goes to the first GfI on the line side and then all the rest of the outlets neutrals are fed from the load side of the gfi, even the next gfi. All connected with one conduit and only one neutral is pulled through the entire run. Do I need a separate neutral to feed the second gfi?

The neutral for the 2nd circuit must connect to the line side of the GFCI

 

[480sparky]

You can't share a neutral between two circuits with GFCI receptacles.

This will not work:

Either install a separate grounded after the first GFI:

Or install a 2-pole GFCI breaker:

 

[laketime]

ok so i just need to add a neutral. thanks guys.

 

[LarryFine]

The neutral from the panel goes to the first GfI on the line side and then all the rest of the outlets neutrals are fed from the load side of the gfi, even the next gfi. All connected with one conduit and only one neutral is pulled through the entire run. Do I need a separate neutral to feed the second gfi?

Yep. The home run neutral should split and feed each GFCI's line-side neutral terminal. Of course, the hots each land on one line-side hot terminal.

From each GFCI's load terminals, you need a separate 2-wire circuit, so each circuit's hot and neutral connect to only one GFCI's fed-through terminals.

In other words, you have to turn the 3-wire circuit into two 2-wire circuits at (as in pigtailing) or before each GFCI's line-side terminals. Pull a gray.