Voltage fluctuations can be caused by a variety of factors such as poor or loose wiring connection, inadequate load sharing, overloaded network, defective electrical products, power line interference, insufficient cable carrying capacity and more. Fluctuations of up to 6 volts are normal in regular residential electrical service and normally will not harm appliances.

If you are experiencing voltage fluctuations that are causing your lights to blink, it may be best to contact a licensed electrician to diagnose and fix the issue. They can help you determine if the voltage fluctuations are due to an issue with your home’s electrical system or if it is due to an issue with your utility company’s power supply.
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