Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

Any Issues Using GFCI Breakers for Charging Circuit?

RandomSample

Member
Jan 4, 2020
19
11
California
Hi Folks,

Any issues with having their home charging circuit on a 30 or 40 Amp GFCI breaker?

I understand that there are longer charging times on these lower amperage circuits.

I'm still in my planning phase. This circuit/outlet will be in my garage.

Thanks in Advance,
 

GHammer

What a long strange trip its been.
Feb 1, 2016
877
1,947
Wren, Oregon
Despite what NEC says, people have reported issues with having charging circuit on a GFCI. When the connector tests for ground it sends a small current that can trip the GFCI on some breakers.
 

marco33

Member
Nov 24, 2019
23
13
Pa
Before I installed my 220, was using a 20amp 110 GFI. in the three week period the GFI tripped three of those days. One day it tripped like three + times in a row, that was very annoying as the reset was in the basement.
 
  • Helpful
Reactions: doghousePVD

theeskimo

Member
Sep 26, 2019
61
64
Vancouver Washington
According to the electrician who did my NEMA 14-50 install who has done “countless” other Tesla specific installs in my area, Square D breakers seem to be more tolerant and cause fewer ground faults than any other brand of breaker he had used in an install. So far I have had zero trips while maxing out my mobile connector.
 
Last edited:
  • Informative
Reactions: rokitnerd

ElectricIAC

Devil’s Advocate
Dec 31, 2019
2,219
549
DFW
Hi Folks,

Any issues with having their home charging circuit on a 30 or 40 Amp GFCI breaker?

I understand that there are longer charging times on these lower amperage circuits.

I'm still in my planning phase. This circuit/outlet will be in my garage.

Thanks in Advance,
Our 14-50 has an Eaton GFCI box which regularly made the Gen2 UMC lose its ever loving mind: My solution? Buy Gen1 UMC and enjoy 40A charging.

I’m aware this isn’t *ideal* but after giving up trying to find a 14-50 plug HWPC or at least a modified one this was the next best thing. For your setup what’s truly stopping you from just going 50A?
 

Scrannel

Member
Sep 27, 2019
146
59
Malibu, CA United States
I believe California is on the 2014 NEC. Thus, my guess is, GFCI breakers are not required. The Mobile cord -- and I think all Tesla cords -- have some sort of GFCI built in. Thus, as others have pointed out, the cable can cause an external GFCI to trip. Just from what have been reading in several forums. I am not an electrician.
 
  • Like
Reactions: Gasaraki

RandomSample

Member
Jan 4, 2020
19
11
California
Thanks for the info everyone. My first preference will be to go for a 50A circuit in the garage. However, it has to be GFCI because it will be serving a dual purpose besides charging a Model 3.
 

doghousePVD

My grandfather’s car
Dec 3, 2018
587
472
New England, USA
The NEC code is complicated and appears to be inconsistent. Verify if in your jurisdiction you actually need GFI for your alternate use.
I believe stoves never need GFI. Depending on which NEC is in force most RV plugs (14-50) do not require GFI.

My understanding is all EVSE have built in GFI.
 
  • Informative
Reactions: Runt8

GPinzone

Member
Sep 3, 2018
324
172
Ronkonkoma, NY
The 2017 NEC is generally interpreted to REQUIRE GFCI on EVSE circuits, so no, it’s not an issue.

Are you implying the 2017 NEC was well thought-out? The GFCI requirement was thrown in at the last moment.

BTW, if you tell an electrician you want a NEMA 14-50 outlet installed and don't say why, then what?
 

rokitnerd

Member
Sep 6, 2020
35
7
New Jersey
According to the electrician who did my NEMA 14-50 install who has done “countless” other Tesla specific installs in my area, Square D breakers seem to be more tolerant and cause fewer ground faults than any other brand of breaker he had used in an install. So far I have had zero trips while maxing out my mobile connector.

Now that it's been 9 months do you still have no issues with tripping?
 

valaeyron

Member
Sep 8, 2020
241
129
Virginia
Hi Folks,

Any issues with having their home charging circuit on a 30 or 40 Amp GFCI breaker?

I understand that there are longer charging times on these lower amperage circuits.

I'm still in my planning phase. This circuit/outlet will be in my garage.

Thanks in Advance,

I have a 240V / 50A line (shared between the unused outdoor hot tub and beloved 14-50 in the garage) on a GFCI. Never an issue...
 
  • Funny
Reactions: ElectricIAC

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top