From time to time, I do some small jobs for sellers getting ready to put their house on the market. A lady wants GFCI’s installed in the bathroom and kitchen of a mid 70’s Split Level. The kitchen receptacles went great.
When I got to the bath, I plugged a shop vac in the receptacle (so I can hear it from the basement) and found the breaker. I returned to the bath, start clipping the wires off the receptacle and ZAP!-it bites the crap out of me! My bad, I know to always use my meter! After 1/2 dozen trips back and forth, I found the “other” breaker that feeds the receptacle. I found, thru testing, that there are two wires that are only “hot” when the lite switch is on, even when disconnected from the receptacle, both black and white are “hot”. The other two feed the vent fan and heater. Yet they are on separate breakers. I checked, the tabs are not broken on the receptacle. It’s wired “normally”, but I can’t understand how it could even work.
I tried just installing the GFCI, wiring it like the old receptacle, but it won’t work. As soon as I turn the light switch (on or off), it trips.
After playing with it back and forth for about 3 hours, I gave up and re-installed the original receptacle.
Anybody ever seen this type of scenario before? I really hate admitting I don’t know hot to fix it!
I think it’s very dangerous to have two separate breakers “feeding” one receptacle. Seems there is a potential for miswiring and creating 220 volts there?