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Electrical Wire and Cable

Ground Wires and 240 Volt Circuits

What should I do with the ground wire on a 240volt circuit? How and Where to Connect Ground Wires on 240 Volt Circuits.


Wiring the Ground Wire for a 240 Volt Circuit

Electrical Question: What should I do with the ground wire on a 240volt circuit?

I’m attempting to wire several 3-wire receptacles to a 4-wire 240volt circuit.

Thanks a lot! Alexis.

This Electrical Wiring Question came from: Alexis, a Homeowner from Santa Cruz, California.

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

How to Connect Ground Wires on 240 Volt Circuits

Application: Installing a 240 Volt Circuit.
Skill Level: Intermediate to Advanced, Best installed by a Licensed Electrical Contractor. Work in electrical panels is not recommended for homeowners, non-experienced individuals or non-electricians.
Tools Required: Basic Electricians Pouch Hand Tools, electric drill, auger bits and extension cord.
Estimated Time: Depends on personal level experience, ability to work with tools and install 240 volt electrical circuit wiring.
Precaution: Identify the main circuit of the panel, turn it OFF and Tag it with a Note before working with the wiring or installing the 240 volt wiring and circuit breaker. Working in an electric panel is dangerous due to arc flash hazards and the possibility of electric shock.
Notice: Installing an additional 240 volt circuit should be done according to local and national electrical codes with a permit and be inspected.

The Ground Wires for a 240 Volt Circuit

  1. The ground wire is the most important wire in any home electrical wiring circuit.
  2. The ground wire should be bonded with all other ground wires and bonded to any metal junction box or enclosure.
  3. The ground wire must also be attached where there is a ground terminal or connection on all devices, which should be present on the 4-wire 240 volt receptacles that you are installing.
  4. Many times the ground terminal is identified with a green screw.

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