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.

  • 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 '18 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 '18 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 '18 at 7:36
  • @SolarMike Don’t forget RCB. – winny Jan 28 '18 at 8:53
  • @winny I didn’t, but the OP asked about his gfci ... – Solar Mike Jan 28 '18 at 9:11

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.

  • Makes sense, I could not understand why it was there and either the breaker or outlet would constantly trip – Jozef Pietrzak Oct 31 '18 at 22:56

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