240V GFCI Randomly Tripping

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Old 08-19-18, 07:20 AM
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240V GFCI Randomly Tripping

We just moved into a house which has a spa installed. There is a 30 amp GFCI and a 20 amp GFCI feeding the hot tub. I tried turning the spa on today for the first time and after about 10 minutes the 30A tripped. Reset it, turned on only 1 pump, 30A tripped again after a couple minutes. Reset it again, but didn't turn on any pumps, and it tripped again after a couple minutes and then would trip immediately upon reset.

Long story short, we ended up totally disconnecting the 2 hot lines at the hot tub end. Same problem, sometimes it would trip right away and sometimes after a couple minutes. It seems to hold just fine if we disconnect the 2 hot lines from the GFCI itself but I am going to do a more thorough test of that today.

The wiring in the disconnect panel looks ok. The neutral from the spa is going to the neutral terminal on the GFCI, and then the neutral from the GFCI is going to the neutral bar in the panel.

Any ideas? Suggestions on next steps to diagnose? It's a pretty short run to the spa (maybe 20 feet).

I've attached a couple photos from inside the panel.

30A is on the left.
 
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Old 08-19-18, 07:51 AM
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Does the wire go underground to the tub? I suspect there's a damaged conductor.
 
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Old 08-19-18, 08:04 AM
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No, it runs under the deck along the ground.
 
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Old 08-19-18, 09:50 AM
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Well, with the hot wires disconnected from the GFCI, after about about an hour it tripped on it's own. Perhaps the GFCI is bad?
 
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Old 08-19-18, 10:54 AM
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If the hot.wires were.disconnected there was not power to trip the gfi. Confused.
 
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Old 08-19-18, 11:47 AM
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The GFCI was powered, the hot wires going from the GFCI to the spa were disconnected. We disconnected neutral going to the spa as well and it's still tripping.

To be clear: The breaker is powered, but the neutral and hot wires that go to the spa have been disconnected at the breaker. It trips within an hour.
 
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Old 08-19-18, 12:07 PM
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To be clear: The breaker is powered, but the neutral and hot wires that go to the spa have been disconnected at the breaker. It trips within an hour.

That pretty obviously a defective breaker and extremely rare.
 
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Old 08-19-18, 12:50 PM
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Originally Posted by PJmax View Post
That pretty obviously a defective breaker and extremely rare.
Yeah I figured as much but wanted to double check in case I wasn't aware of any other possible issues. I've ordered a new one, hope it works! Thanks
 
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