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Hi, I have some experiance with installing plugs and switches but don't know how to install GFCI's when they have a switch next to it in the box. Should both white wires be connected to go to the LINE or one to the LINE and the other to the LOAD or both just capped off with a wire nut and tucked in the box. Would be appreciated to have this explained. Thank You
If power is going to the Gfi first (and it should) supply power coming in goes to the LINE terminals and then the line going from there to the switch comes from the LOAD terminals. So to answer your question white wire coming in to the LINE and white wire going to the switch coming off the LOAD.
Only hook up wiring to the LOAD side of a GFCI receptacle you wish to be protected by a GFCI. If this switch controls the garbage disposal, do not connect it to the LOAD side. Do the connections inside of a wire nut and feed out to the LINE side of the GFCI and to the switch independently. Always be mindful of anything hooked to the LOAD side of a GFCI. Because when the GFCI receptacle TRIPS to the OFF position, the LOAD side wiring goes dead. If the LOAD side wires feed a refrigerator, you will lose all your food. If the LOAD side wiring feeds the remaining circuit (In some cases, bedrooms or garage door openers, or critical needs) you can be left without power when GFCI protection for these areas was never needed. The LOAD side of a GFCI receptacle is only designed to have loads connected which need protection of ground fault circuit interrupter.