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Ralph Mowery

In article ,
says...

Just out of curiosity, is there a way to tell if two wall outlets are on
the same circuit breaker without tripping the breaker or turning breakers
on and off? I'm pretty sure it's not possible but maybe there's a way I
hadn't thought of.

If you do not mind opening the breaker panel, very easy.

PUt a clamp on amp meter on all the breakers and write down the current.
Then plug a hair dryer or some other device that draws a lot of current
and go down the breakers again and look for a large increase in current.
You may have to do this a few times as the refrigerator or other device
in the house could turm on. It may be even quicker to do it backwards
and just look for the circuit that is drawing the most current. Then cut
off the hair dryer.

Trader mentioned the fox and hound. They usually work well enough. I
have used one a few times in the past. They work very well for what you
want provided the breakers are not side by side.