250 148 Continuity And Attachment Of Equipment Grounding Conductors To Boxes
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How to ground an outlet to a metal box. The grounding wire nut shown has a hole in its top that makes installing a pigtail easier. Remember most recpetacles have one hole tapped 10 32 for a ground screw. Replace the outlet and put a label on it that reads no equipment ground.
If your outlet has 3 prongs use a 3 prong tester which has lights on the end that will tell you exactly whats going on with the outlet. Place one lead into the hot port on the receptacle then put the other lead onto the metal box or plate screw. In a system with metal boxes the pigtail method is considered the most secure.
It must be connected to this terminal not to the load terminal or the gfci wont offer any protection. Then the hard flush mating of those bare metal surfaces is an adequate grounding path for the receptacle and you dont need a ground jumper. Metal receptacle outlet boxes must be grounded and one method is to pigtail the ground wire so that it is attached to the outlet and the metal outlet box using a green grounding screw.
Leave the ground terminal disconnected. If the outlet only has 2 prongs use a multimeter. Here are some electrical tip for home outlets use a plug in circuit analyzer to check to make sure your outlets are grounded and wired correctly.
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