Lights that go Dim

By Dave Rongey
Summary: Electrical Lighting Question: In the basement of my house there is a electrical circuit with a 15 amp circuit breaker and 14/2 wire which powers four lights, a deep freeze, a heat exchanger and four other outlets.

What Causes Lights to go Dim

Why Lights Go Dim.

In the basement of my house there is a electrical circuit with a 15 amp circuit breaker and 14/2 wire which powers four lights, a deep freeze, a heat exchanger and four other outlets. The four other outlets are not in use. Occasionally, the lights will go dim. What could be causing this problem?
Thanks, Eric S.

Hi Eric - Great Electrical Repair Question!
Because the circuit is only 15 amps and you have a few considerable loads which include the compressor of the deep freeze, I would suspect that the dim lights that are being experienced due to the freezer compressor cycling on, especially if the heat exchanger is running. This can also be due to other major loads which are on the same buss back at the panel.

You may want to consider installing a separate circuit for these two devices, especially you ever plan to add any additional loads to this circuit.

From: Eric S.
Thanks so much for your quick reply. I will certainly take your advice and put these devices on a separate circuit.

I do have another Question:
I just installed two split receptacles on a switch for the use of my lamps in my recreation room. As always I tested these receptacles and discovered on one tied to the switch, that when the switch is in the off position a faint light comes on my tester. This doesn't happen on the other receptacle The top of these receptacles are fine. I checked the situation and found the ground wasn't tied to the receptacle. Once I connected the ground and retested there was no light on my tester. Why would leaving the ground of the receptacle allow a little voltage on the switch side of the outlet when the switch is in the off position?
Thanks again, Eric

Many times when you get a dim light this indicates a feedback, usually through the neutral. I'm not sure which tester you are using, possibly and induction type where it uses an internal coil and not electronic logic, so this will produce that reading with a feedback which is indicating a lower voltage. I would check your circuit.

Make sure the ground is bonded at the panel circuit source and that this bond is continued at all junction box locations. At the location of the circuit it's a good idea to separate the incoming circuit, verify the readings, polarity etc. Then verify that none of the load side wiring is crossed up as to maintain correct polarity.

Where half-hot switched outlets are used the neutrals can be bonded through so there is no need to break the neutral tie bar or jumper on the outlet as long as the circuit is the same source for both sides of the outlet. Dave Rongey, Licensed Electrical Contractor, Assisting with Home Electrical Troubleshooting and Electrical Repairs

« Junction Box Wiring for a Wall Fixture

Why CFL Lamps Burn Out Fast »

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 Electric Wiring Project.

See How to Wire it Right!

Learn about How to Wire a House
Complete Guide to Home Electrical Wiring
Perfect for the Homeowner, Handyman,
Electrician and Building Inspector.
Includes:
Methods of Home Electrical Wiring
Wiring Diagrams for Light Switches
Wiring 3-Way, 4-Way and Dimmer Switches
Installing Fluorescent Light Fixtures
How to Make Your Own Light Fixtures
....and much more.
» Click here to learn more about Home Electrical Wiring «

Wiring Light Fixtures Questions and Answers

Repair Electric Lights

Wiring Electrical Light Fixtures Anti-Rodent Strobe Light Wiring Basement Wiring for Lighting and Plugs PIR Lighting Control Wiring Lighting Fixture Conversion Wiring Replacing a Lighting Ballast Wiring Flush Lights and Switches Replacing a Type A Light Bulb Junction Box Wiring for a Wall Fixture What Causes Lights to Go Dim Why CFL Lamps Burn Out Fast Wiring a Motion Light and Security Camera Wiring a Ceiling Light Fixture from an Outlet Wiring Lights from a Wall Switch

» How To Wire It RIGHT!«
Wire it with Confidence!
Fully Illustrated
Instant Download

Now You Can
Wire it like a Pro!

Comments

I think your site offers the the clearest and best electrical information for homeowners I have ever seen on the net.You have given me confidence to do my own projects which I never had before. THANK YOU!
Paul, from Foxboro, Massachusetts

I wish I found this site earlier, it is by far the best electrical related resource I have found on the web.
George, from Scranton, Pennsylvania

I love this site for an office worker that does not know anything about electric wiring.
Bill, from New York City, New York

This site is so much better
than the 3 books I just bought,
I wish I came here first.
Collin, from Grand Rapids, Michigan

Thank you for answering my question.
I was able to get this done.
This site is perfect.
I am glad I found it.
Please keep it going.
Mike, from Chicago, Illinois
Read more Comments

Leave a Comment

Electrical Wiring and Electrical Repairs

Skill Level:
Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Licensed Electrical Contractor.
Tools Required:
Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter.
Estimated Time:
Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area.
Precaution:
Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring.
Important:
Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and national electrical codes with a permit and be inspected.