Voltage Fluctuations

Temporary voltage fluctuations from the utility grid or within your home can cause lights to flicker briefly. This is normal when large appliances such as air conditioners, refrigerators, or clothes dryers cycle on, drawing a surge of current that momentarily dips the voltage.

When It Is Normal

Occasional, brief dimming that coincides with a large motor starting up is common and usually harmless in homes with standard 100- or 200-amp service panels.

When to Act

• Frequent or prolonged flickering unrelated to appliance use may indicate a problem with the utility supply. Contact your electricity provider to request a voltage check.
• Persistent voltage sags can damage sensitive electronics. A whole-house surge protector, installed by a licensed electrician, can help protect your equipment.
• If flickering affects the entire house at random, a loose service-entrance connection or failing neutral is possible and requires immediate professional inspection.