Electrical Questions? Ask an Electrician Online.
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1) Is the wall box metal or PVC plastic?
2) Does the wall box contain any bare copper or green insulated house ground wires?
3) The GFCI needs to be connected to an always live hot circuit feed and a white neutral wire on the LINE side. Have you confirmed that the wall switch box contains a white neutral wire?
4) Do you have a 2 wire lead AC voltage tester (a contact type) or an AC voltmeter to confirm the hot and neutral?
5) Are the wall switches single pole or 3-way types?