DIY Home Improvement Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter #1
I have a mwbc where one is running my kitchen outlets, and the other is running a dedicated circuit for the disposal. the breakers are adjacent in the panel, so they are on opposite phase and share a common neutral and ground. I was updating the outlets and so turned off only one of the breakers. when I tested the line to make sure it was off, my voltmeter still read about 10 volts. Is this normal? there were no appliances connected to either circuit.
 

·
Registered
Joined
·
2,446 Posts
Yes, that sounds normal. The combination of a high impedance meter input and inductive coupling in the AC wires causes this. If you were to plug a lamp into one of your kitchen outlets while the breaker is off the voltage should disappear as you are placing a low impedance path from the hot to a grounded conductor.

It is good practice to turn both breakers off when working on a MWBC.
 

·
Semi-Pro Electro-Geek
Joined
·
3,403 Posts
It is good practice to turn both breakers off when working on a MWBC.
For sure! A MWBC is NOT DEAD unless both breakers are off.
 
  • Like
Reactions: SD515

·
Super Moderator
Joined
·
8,910 Posts
I thought MWBC circuits were to have ties on the handles by code? At least thats what you guys taught me.
Depends on the code cycle when installed.
 

·
Registered
Joined
·
2 Posts
Discussion Starter #7
thanks

thanks for the assurance. this house was built in 1976, so at the time no breaker bar was required.

thanks again.
 
1 - 7 of 7 Posts
Top