I saw a couple threads from a few years ago, just wondering if people are using GCFI breakers now, and if so, are you experiencing any issues with the UMC?
(NEMA 14-50 outlet)
Thanks!
(NEMA 14-50 outlet)
Thanks!
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See this post from FlasherZ, the resident TMC expert on such issues: NEMA 14-50 outdoors
As far as I know, no one makes a GFCI 14-50. OTOH, the UMC and the HPWC both have GFCI's built in.
I have one now in my panel (50 amp), for my hot tub.
I use a 50 amp GFCI circuit breaker feeding the NEMAN 14-50. I'm not concerned about a shocking hazard from the UMC but from the 220 40 amp outlet when the UMC is not plugged in. Mine is outside and I want to protect against some kid sticking a nail in one of the hot contacts.I saw a couple threads from a few years ago, just wondering if people are using GCFI breakers now, and if so, are you experiencing any issues with the UMC?
(NEMA 14-50 outlet)
Thanks!
I use a 50 amp GFCI circuit breaker feeding the NEMAN 14-50. I'm not concerned about a shocking hazard from the UMC but from the 220 40 amp outlet when the UMC is not plugged in. Mine is outside and I want to protect against some kid sticking a nail in one of the hot contacts.
Probably not a bad idea. I had a similar concern with my solar installation. The disconnect switch on the outside of my house connects the array to the unfused mains (a supply side connection on the utility side of the main breaker). I put a lock on the box so an inquisitive kid walking through the yard couldn't open it, poke around inside, and get zapped.Mine is outside and I want to protect against some kid sticking a nail in one of the hot contacts.
So, you aren't having any issues then? I had seen a few posts from the early Model S days that said people were running into trouble with the UMC running on a GFCI breaker.
While no one makes a GFCI 14-50, you are very correct that it is possible to buy a 50 Amp GFCI breaker. The typical "hot tub", GFCI breaker and the GFCI in a UMC check the balance of current across the two Line wires, but to do a truly, all-possibilities, 14-50 GFCI, it needs to check the balance across the two Lines and the Neutral in a 14-50, combined. I do not know of such a product. If you do, please send a reference.
This thread got me thinking about "what's in a GFCI" - is there a current transformer and a small PCB, or is it some sort of electro-mechanical thing?
I found this (very informative) presentation, if anyone's interested: http://www.nema.org/Products/Documents/NEMA-GFCI-2012-Field-Representative-Presentation.pdf
So....I already have a GCFI 50 amp breaker in place (used to be hot tub). Should I use this? Or swap it out for a non-GCFI? Potential for issues with UMC or no?
+1 - can't hurt to try it as is. I see no need to put a new breaker in "just in case."I'd just use the existing GFCI breaker. It probably will work fine, but if it gives you trouble, you could switch it to a non-GFCI because the UMC has one also.