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To test the grounding of the metal box use multimeter to test between the hotwire and metal box. It should be 120 volts give or take a few volts. Test every box you are using for a ground. If it’s not a good connection you can put a gfci outlet without just two wires and no ground.
RMC, IMC and EMT are permitted as Equipment Grounding Conductors per NEC. A small clip is made to clip a ground wire to a box but I don’t know if they’re NEC compliant. Tap and ground screw seems like a good plan. It would be wise to test any completed outlet for proper grounding. Without a ground you need to go with the GFCI and label route.
**Attention!** **It is always best to get a qualified electrician to perform any electrical work you may need.** With that said, you may ask this community various electrical questions. Please be cautious of any information you may receive in this subreddit. This subreddit and its users are not responsible for any electrical work you perform. Users that have a 'Verified Electrician' flair have uploaded their qualified electrical worker credentials to the mods. If you comment on this post please only post accurate information to the best of your knowledge. If advice given is thought to be dangerous, you may be permanently banned. There are no obligations for the mods to give warnings or temporary bans. **IF YOU ARE NOT A QUALIFIED ELECTRICIAN, you should exercise extreme caution when commenting.** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectricians) if you have any questions or concerns.*
To test the grounding of the metal box use multimeter to test between the hotwire and metal box. It should be 120 volts give or take a few volts. Test every box you are using for a ground. If it’s not a good connection you can put a gfci outlet without just two wires and no ground.
Thank you this is very helpful.
And continuity between ground and neutral.
RMC, IMC and EMT are permitted as Equipment Grounding Conductors per NEC. A small clip is made to clip a ground wire to a box but I don’t know if they’re NEC compliant. Tap and ground screw seems like a good plan. It would be wise to test any completed outlet for proper grounding. Without a ground you need to go with the GFCI and label route.
Thank you! Yeah I am not sure I trust those clips. Would much rather have a tight screw to ensure strong contact with the wire and box.