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I recently bought a house. In the dinning room, the previous owners added a gfci outlet connected to a gfci breaker. What might they have used this for? I can’t seem to find any relevant case. Location is Lafayette, IN.

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  • A GFCI breaker is mandatory in the USA for 'wet' areas such as the kitchen and bathrooms. There are no rules for using them in dry areas, unless the building is in a flood zone. Even then it is still at the owners discretion. Maybe just being cautious.
    – user51490
    Jan 28, 2018 at 7:14
  • Note that UL standards are changing all the time. Arc Fault breakers are required now in some areas, especially old houses with aluminum wiring. Ten years from now a new house may need both types for the entire house.
    – user51490
    Jan 28, 2018 at 7:18
  • Would they have been taking power outside - barbeque area lights? or for an electric lawnmower? In the UK, outside electric tools require the use of an ELCB (Earth leakage Circuit Breaker) - GFCI to Americans...
    – Solar Mike
    Jan 28, 2018 at 7:36
  • @SolarMike Don’t forget RCB.
    – winny
    Jan 28, 2018 at 8:53
  • @winny I didn’t, but the OP asked about his gfci ...
    – Solar Mike
    Jan 28, 2018 at 9:11

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With a GFCI breaker no other GFCI device is needed and sometimes a second GFCI device can cause nuisance tripping. I have seen a DIY person that did not understand put close to 50 GFCI outlets in his home that only had 5 or 6 branch circuits and thought he had miswired because now he was constantly tripping them. So why was a GFCI outlet added to a GFCI protected branch circuit? Probably because the person did not understand how they work.

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  • Makes sense, I could not understand why it was there and either the breaker or outlet would constantly trip
    – Jozef Xie
    Oct 31, 2018 at 22:56

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