Electrical Wiring Electrical Troubleshooting and Electrical Repairs

»NEW eBOOK«
Electrician Training Electrical Certification
»NEW eBOOK«
wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs wire outdoor light fixture Home Electrical Wiring Diagrams
wiring home generator and transfer switch wiring a 220 volt range cord outlet Wiring for GFCI Outlets Wiring Outlets and a Switched Outlet Wiring and Installing Ceiling Fans and Remote Controls wire dimmer switch wiring diagrams for switches wiring a dryer cord and 220 outlet circuit breaker panel
Electrical Wire and Cable


How to Troubleshoot a Light Circuit


electrical troubleshooting wiring repair By
Summary: Electrical Troubleshooting Question: An electrician wired a single pole switch box to two ceiling flush mount fixture boxes. I can't figure out what they did to hook it all up now that I finished the room.

Electrical Troubleshooting: Troubleshooting a light circuit


Electrical Troubleshooting Question:
An electrician wired a single pole switch box to two ceiling flush mount fixture boxes. I can't figure out what they did to hook it all up now that I finished the room. All wires are Romex 12/2. Fixture 1 seems to have the source power, with one spliced Romex end with electric tape wrapped around the Black and White. There is a second Romex cable here, presumably to head down to the switch. Fixture 2 has a single Romex end, presumably leading to the switch box. In the switch box there are 3 romex cables. One was marked as feed, which I think would lead to the fixture

box at Fixture 1. So I can't figure out why there are 3 cables in the switch box and how to wire this.
Thanks- Dave.

Hi Dave - Great Electrical Repair Question!
In order to positively identify the wiring you will need to do some electrical troubleshooting and to help do this you will need to use a ohm meter. Here is a procedure that should help you. I have also added a link below to wiring diagrams which may help you understand how this circuit may be wired. How to Identify Light Fixture and Switch Wiring. This article will help you identify a pair of wires with the power off. You will be using a Tester that will send a small amount of voltage through the wires which will produce a reading or tone , depending on the meter you will be using. Common Ohm Meters or Signal Testers: Volt / Ohm Meter. Required: Volt / Ohm Meter, Wire connector. First: Be sure the circuit is OFF and clearly labeled that the circuit is to Stay Off while you are conducting these checks. *Verify that the circuit is in fact OFF using a Volt Meter or Circuit Tester. After you have verified the power is off proceed

Ohm Meter Setting: Set your Ohm Meter to measure a low resistance setting such as Rx1K or 1000 Ohms. Touch the test leads together to test your meter, you should get a 0 reading which means there is zero resistance between the two test leads. Identifying a set or pair of wires: Select the pair of wires you need to identify at one location. Remove the insulation back about one half inch. Twist a wire connector on these two wires creating a temporary splice. Next: Select one of the pairs of wires you are working with. Remove the insulation back about one half inch. Testing with the Ohm Meter: Now using the ohm meter place the one test lead to one wire, and the other test lead to the other. If you get a 0 resistance reading go to the pair of wires where the wire connector creates the temporary splice and remove the wire connector. Re test the ohm meter on the other pair of wires and see if you still get the 0 reading. If there is no 0 reading then you have identified this pair of wires. Label this pair of wires and proceeded with the test to identify any other pairs of wires.

related

Join the Discussion!

Add Your Residential Electrical Wiring Question or Comment

Electrical Wiring Question
click here to ask a Electrical Wiring Question
Comment
click here to leave a Comment

» You Can Avoid Costly Mistakes! «

Here's How to Do It:
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project.

See How to Wire it Right!

Learn more about Residential House Wiring
Complete Guide to Home Electrical Wiring
Perfect for Homeowners, Students and Electricians
Includes:
Home Electrical Wiring - Upgrade Electrical Wiring
Wiring 120 Volt Circuits
Wiring 240 Volt Circuits
Wiring Multi-Wired Circuits
Wiring Methods for Installing Home Electrical Circuit Wiring
Electrical Codes for Home Electrical Wiring
Electrical Troubleshooting and Repairs
....and much more.

» Click here to learn more about Home Electrical Wiring «
  electrical wiring
Electrical Wiring Book
 



Top of Page