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Electrical Wire and Cable

Grounding Electrical Outlets in a Garage

How should I ground an outlet to a box? How to Ground Electrical Outlets: Grounding the box and the outlet using a method that works with your wiring and box space.

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Ground Wires for Outlets
[ad#block] Electrical Question: How should I ground an outlet to a box?

I am running MC cable (3/8-1/2″) into handy boxes in series around my garage wall. I have one cable entering bottom of handy box and one leaving the top of handy box. How do I ground the box and outlet? the conductors are stranded copper. Do I strip the insulation and wrap around the ground screw on box and use crimp clamps to bond wires and use the tail of one to bond outlet, or do i need to use ring terminals and take all grounds to box ground screw, or wire nut all grounds and use 2 pigtails , 1 to box and 1 to outlet?

Background: Chris, a Handyman from Dover, Tennessee.

Dave’s Reply:
Thanks for your Electrical Wiring Question Chris.

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Wiring Electrical Outlets for the Home

Home electrical wiring includes 110 volt outlets and 220 volt outlets and receptacles which are common place in every home. See how wiring electrical outlets for the home are done.

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Complete Guide to Home Electrical Wiring

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The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

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The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

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FAQs Frequently Asked Questions and Comments

2 Responses to “Grounding Electrical Outlets in a Garage”
  1. Kevin says:

    I just bought a hot tub and was having some ground issues. I was wondering how to ground the outlet that the hot tub is plugged into. It’s already plugged into a receptacle in my garage which gets all its power from the breaker box in my house. I was troubleshooting and found that if I push the outlet back against the garage siding where it is and put the cover back on it the hot tub will give off a charge. If I pull the receptacle out and plug it in so it isn’t touching anything, then there is no shock from the hot tub. So….. how would you ground that receptacle?

  2. Dave Rongey says:

    Hi Kevin,
    Most hot tubs require a dedicated circuit which is not shared with anything else. So if that is the case with your hot tub you should check the specifications and have a dedicated circuit installed with GFCI protection as described in the installation manual.
    As for the garage outlet that is causing a charge and shock hazard I would highly recommend turning off the circuit that supplies power to the outlet. The outlet should be removed so the electrical box and securing hardware may be inspected for improper installation and loose or faulty wiring connections. If the circuit wiring includes a ground wire then make sure the termination of the ground wire to the outlet is correct. Keep in mind that accessible outlets in the garage should have ground fault protection, and this can be accomplished by installing a GFCI circuit breaker, or by installing one or more GFCI Outlets.
    I hope this helps you.