SDmark
Member
My 1950s San Diego home had a master bedroom added in the 70s, I think it was. There is a 12-3 cable going to the addition. Cable has red, black, and white wires, no ground wire. Circuit #3 is the washer and gas dryer. Circuit #13 is the rest of the bedroom. Breakers for #3 and #13 are both on the left side of the breaker box.
Using a digital voltmeter at a junction box before the cable enters the addition, I see what to me are some strange readings [updated 2/17 including black and red, with 240v circuit on opposite side of panel on]:
Both breakers off:
Black and white: 1v (started about 3.5v and declined)
Red and white: 1v (started about 3.5v and declined)
Black and red: 0v
Only breaker #3 on:
Black and white: 41v
Red and white: 120vv
Black and red: 74v
Only breaker #13 on:
Black and white: 119v
Red and white: 44v
Black and red: 69v
Both breakers on:
Black and white: 119v
Red and white: 121v
Black and red: 241v
Is it normal for there to be 41-44v on a circuit that is turned off? If not, what could cause that and how do I fix it?
Thanks very much,
Mark
Using a digital voltmeter at a junction box before the cable enters the addition, I see what to me are some strange readings [updated 2/17 including black and red, with 240v circuit on opposite side of panel on]:
Both breakers off:
Black and white: 1v (started about 3.5v and declined)
Red and white: 1v (started about 3.5v and declined)
Black and red: 0v
Only breaker #3 on:
Black and white: 41v
Red and white: 120vv
Black and red: 74v
Only breaker #13 on:
Black and white: 119v
Red and white: 44v
Black and red: 69v
Both breakers on:
Black and white: 119v
Red and white: 121v
Black and red: 241v
Is it normal for there to be 41-44v on a circuit that is turned off? If not, what could cause that and how do I fix it?
Thanks very much,
Mark
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