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Why Lights Dim When the Central AC Unit Starts

By Dave Rongey - Summary:

Why do my lights dim when my central AC Unit comes on? Evaluating an Older Home Electrical System.

Lights Dim

Home Electrical Question: Why do my lights dim when my central AC Unit comes on?

This home electrical question came from: Phillip, a Handyman from Texarkana, Texas.

Additional Comments: Very good. Lots of information.

Dave’s Reply:
Thanks for your electrical wiring question Phillip.

Evaluating an Older Home Electrical System

Application: Upgrading an Older Home Electrical System.
Skill Level: Advanced – Best performed by a Licensed Electrician.
Tools Required: Electricians Tools including a pouch of hand tools and the various power tools necessary for installing electrical circuit wiring and upgrading the electrical panel as required.
Estimated Time: Depends on type of existing panel or fuse box, the replacement panel to be installed, the original wiring methods that were used for installing the existing wiring, the number of circuits to be replaced or new circuits to be installed, the and available access to the project areas.
Precaution: This is an extensive project that should be performed by a Licensed Electrician and typically requires specifications in accordance with the local building department and the utility company or electric service provider. Working in an electric panel is dangerous due to arc flash hazards and the possibility of electric shock.
Notice: Making changes to home electrical wiring and the electric service panel should be done according to local and national electrical codes with a permit and be inspected.

Dim Lights when Large Electrical Equipment is Starting

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