how can i fix this i know i need matching brakers what ones do i need and how do i install a gfci ?

[Pumper187]

 

[Megawatt]

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You can go to Home Depot or Lowes and get a GE double pole GFCI breaker and install it in your panel. It will come with a white wire already installed so hook that wire up to the neutral bar. What ever size I don’t know since there is not enough information