K & T- multiwire branch circuit question


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Old 08-26-14, 03:19 AM
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K & T- multiwire branch circuit question

Hi there, wondering if the pros could advise on the following.

I have a duplex that is being renovated where there is a multiwire branch circuit that a) runs the lights on the main floor and b) runs the lights on the second floor.

The second floor is getting new wiring and a new panel. I have removed the fuse with the hot going up to the second floor, essentially leaving the other 15amp circuit to run the lights on the main floor.

The concern I have is that they share a neutral. Is there any issues leaving it set up as is, with the hot for the 2nd floor circuit disconnected? Does that old wiring on the second floor need to terminate in a junction box? My concern is the shared neutral, which will be used for main floor lights, but terminates nowhere upstairs.

Thanks
Gerry
 
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Old 08-26-14, 04:42 AM
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The concern I have is that they share a neutral
.

is OK

Is there any issues leaving it set up as is, with the hot for the 2nd floor circuit disconnected?
no put a wirenut on it in the panel and mark it just in case you need it

Does that old wiring on the second floor need to terminate in a junction box?
yes


My concern is the shared neutral, which will be used for main floor lights, but terminates nowhere upstairs.
terminate in a box
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Old 08-26-14, 06:19 AM
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The neutral is not being shared if you have removed the one hot from the multi-wire circuit. It would now just be a standard circuit.

However if you ran a new hot to the second floor it is going to need the associated neutral run in the same raceway or cable and originate in the same panel as the hot.
 
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Old 08-26-14, 06:58 AM
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Yes, but currently it's not in a box. I had cut the wires (K&T) assuming it was one circuit. It wasn't until I opened the panel that I saw it was a multiwire branch circuit. I'll add a junction box and hold the neutral and the hot (that is no longer used) in there as john suggests.

Does that make sense?
 
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Old 08-26-14, 08:47 AM
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You should have mentioned K & T in your first post.

If you are renovating..... won't you be removing this K & T ?
Do you know where the neutral connects on the first floor.... it you do.... disconnect it.
 
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Old 08-26-14, 09:01 AM
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All the K & T is being removed on the second floor, hence the issue with the neutral. As to where it connects, I have no idea. I suspect that there is a hidden junction box in the wall (there was one on the second floor as well). The main floor K&T is running lights only, so my preference is to keep it rather than begin opening up walls and ceilings, and close off the K&T on the second floor as the walls have been exposed on that floor.
 
 

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