Why is 248 volts coming out the 220 volt circuit?

Answer 1

Answer for USA, Canada and countries running a 60 Hz supply service.

You need to call your power company and have them confirm they are supplying an acceptable voltage.

However, what most residents call 220v service is called 240v service in the code and most equipment can run on anything within 10% of that, or from 216v to 264v. Many power companies do not supply homes with more than 220v. You get a little less light out of light bulbs and electrical heating equipment provides a little less heat than the rated wattage. But equipment lasts longer and you have fewer power-related problems.

Likewise, the corresponding lower voltage of the same system is often called 110v but is actually 120v in the code and equipment can run on anything within 10% of that, or 108v to 132v.

There are other things that may be wrong but they require a competent electrician to check out.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.