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Testing 220 Volts

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?

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

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For Best Results Consult a Licensed Electrical Contractor.
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NEC Codes for Home Electrical Wiring
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The Safest Way to Test Electrical Devices and Identify Electric Wires!

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.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

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 “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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