Testing 220 Volts


By Dave Rongey - Summary:

Testing 220 Volt Electrical Circuit Wiring: On a 220 volt circuit I am getting 120 between green and black and green and the red wire, is this correct?


220 Volt Electrical Circuit

Electrical Question: On a 220 volt circuit I am getting 120 between green and black and green and the red wire, is this correct?

I have a 220 swimming pool electric junction box with 4 wires:  black, red, white & green ground wire. I am currently getting 120 between green and black and green and red wire. Is my wiring correct? Is my wiring damaged or crossed?

  • Red 120 Power.
  • Black 120 Power.
  • White Neutral.
  • Green Ground.

Background: Subhash, a Homeowner from Troy, Michigan.

Dave’s Reply:
Thanks for your electrical question Subhash.

Testing 220 Volt Electrical Circuit Wiring

Application: Testing Electrical Circuit Wiring.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrician.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with hand tools and electrical troubleshooting skills.
Precaution: Identify the circuit, turn it OFF and then Tag it with a Note before performing any wiring or inspections.
Important: Testing 220 volt circuit wiring is best performed by a qualified electrical contractor.

Testing a 220 Volt Circuit

When testing a 220 volt circuit it is normal to get a 120 volt reading from one power leg to the ground wire or to the neutral. As for any other situations about your swimming pool electrical equipment it is best for you to call a licensed electrician.

More about 220 Volt Electrical Wiring

Using Electrical Testers
digital-tester

Understanding Electrical Testers

When working on home electrical wiring using voltage testers can play an important part in electrical safety. Electrical testers enable you to identify electrical circuits and help prevent the possibility of accidental electrical shock.
Types of Electrical Testers

Information about 220 Volt Wiring
220 Volt Wiring Diagram

This link is helpful as a Homeowner
Do-It-Yourself Electrical

Make sure not to miss these Resources for: How-To-Videos
Electrical Videos

For Best Results Consult a Licensed Electrical Contractor.
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2 Responses to “Testing 220 Volts”
  1. Jim Bubela says:

    I found a 220 volt electrical wire hanging from rafters underneath my deck. This wire was used to service a hot tub which was removed before I bought the house. I don’t see a specific breaker on my electrical panel for the hot tub. Whoever disconnected the hot tub left the three coated wires and the aluminum ground cable exposed. What testing method or device can I use short of having to call an electrician to see if the wire is hot.

    • Dave Rongey says:

      Hi Jim,
      A voltage tester is commonly used by an electrician to test a 220 volt circuit as described above in this question. You may also see more information in the section about electrical testers as provided above as well.
      Be Safe,
      Dave


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Testing 220 Volts


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