There's been some discussion on this board about the NEC 2020 requirement for GFCI on 240V ("250V") outlets. I assume houses built prior to that new rule won't need to be retrofitted. Is GFCI required when adding a new 240V outlet in the garage? Years down the road, what are the chances an inspector will flag it to potential buyers?


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    Think that for putting a new circuit today, it has to be GFCI protected. A circuit already in, does not(usually the case). Just changing the receptacle would not mean it needs to be brought up code, upgrading the cable and receptacle and it does need to be to code and protected.
    – crip659
    Commented Mar 22, 2022 at 0:15
  • Circuits can be grandfather, houses can't. 100 year old houses can keep the circuits already in it. Any new circuits made must be done to new code, but can keep the old circuits as they are, but a good idea to bring them up to code, if done to very old code.
    – crip659
    Commented Mar 22, 2022 at 13:37

1 Answer 1


Not grandfathered. GFCI required for receptacles. 100% chance of being caught. The date for NEC compliance purposes is the date on the permit. Unpermitted work has no permit, so its date is the future.

Hard-wired 240V loads don't need GFCI protection.

If this is for electric vehicle charging, you are falling into a very common novice mistake. EVSEs should not be on GFCI, because they have a much superior GFCI of their own.

The little "fits in a shoebox" EVSE that comes with the car is intended to live in the trunk and be used for opportunity charging on the road. It should not be your primary EVSE.

  • Actually, it gets more complicated. If I read the linked document correctly (which is not necessarily the case...) for garage/basement/kitchen/bathroom/etc. most hard-wired circuits are exempt from GFCI requirements (and therefore, install a hard-wired EVSE and end of story) but it seems that most outdoor circuits (HVAC, etc.) now require GFCI even for hard-wired loads, though the document also makes it clear that it is only for new stuff, not direct replacement of existing equipment. Commented Mar 22, 2022 at 0:22
  • "EVSEs should not be on GFCI" ... Are outlets intended for EVSE use exempted from the GFCI rule? J1772 EVSE adapters are readily available online with a myriad of plugs: 6-50, 14-50, 14-30, etc
    – pmont
    Commented Mar 22, 2022 at 0:29
  • The ideal situation (but whether allowed or not will depend on the particular equipment) is to hard wire EVSEs. That (a) removes a point of failure (loose plug) and (b) eliminates the GFCI requirement under current NEC rules. I really don't understand why, except when required by code (sometimes jurisdiction specific) anyone would install any major permanently installed appliance (dishwasher, disposal, oven, EVSE, etc.) cord/plug/receptacle instead of hard-wired. Just makes no sense to me. (Washer, dryer, refrigerator are different - but they're not attached to a wall or cabinet or sink.) Commented Mar 22, 2022 at 0:35
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    @pmont If your question is about EVSEs particularly, I can expand on that. What you're missing is that hard-wiring the EVSE is a choice on the menu. When you hard-wire the EVSE, there is no need for a second, stupider GFCI. Commented Mar 22, 2022 at 0:41
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    @manassehkatz Yes, the portable/shoebox travel EVSE uses a NEMA 14-50 is so you can charge at RV parks. That does not reflect how wall-mount EVSEs should be wired. Commented Mar 22, 2022 at 0:54

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