GFCIs help protect against electrical shocks. The
National Electrical Code (NEC) requires GFCIs in all wet or damp locations
such as kitchens, bathrooms, laundry rooms, basements, garages and workshops.
should be tested monthly to ensure they are providing protection. Press
the TEST button, then RESET button every month to assure proper operation. If
the indicator light does not go out and come back on or if the GFCI cannot be
reset, it must be replaced.
Remove mounting screws and gently pull the switch out of
the wall box.
If replacing an existing GFCI label the black and white
wires on the Line and Load terminals.
Prepare Wires for Connecting the New GFCI
Prepare wires by making sure they are straight. Cut if
Remove insulation so ¾ in. of the copper conductor is
Identify the Line Wires
Pull wires out of the wall box and position them so they
can not touch each other.
Restore power and carefully touch the black probe to the
metal box or bare copper ground wire. If installing a GFCI on an ungrounded
circuit, please refer to the manufacturer's instructions.
Place the red probe to each black wire until the tester
lights up. This is the black wire that will connect to the Line brass screw
Leave the red probe on the black Line hot wire and place
the black probe on each white wire until the tester lights up. This is the
white wire that will connect to the Line silver screw terminal.
Turn power off.
Connect the Wires
Unscrew the terminal screws of the new GFCI until they
are difficult to turn.
Connect the black Line hot wire to the brass screw
marked line by inserting the wire into the Back-wire hole and tighten the
Connect the white Line neutral wire to the silver screw
marked Line by inserting the wire into the Back-wire hole and tightening the
If the outlet box has four wires plus a ground, connect
the second black wire to the brass terminal marked Load and the second white
wire to the silver terminal marked Load.
Connect the ground wire to the green ground screw by
inserting the wire into the Back-wire hole and tighten the terminal screw. If
there are multiple ground wires, connect them together with a copper pigtail,
secure with a wire nut and attach the loose end of the pigtail to the green
Place the GFCI into the Wall Box
Carefully bend the wires and push the GFCI into the wall
Tighten the mounting screws to secure the GFCI to the
Cover with Wall Plate
Install the wall plate.
Restore power and press the Reset button.
If the GFCI does not reset, the line and load leads may
have been reversed during installation. Please refer to the "Test Your Work"
section of the manufacturer's instruction sheet or call a qualified