How should an unused knob and tube run be terminated?

Question

What are the safe and compliant options for terminating an unused knob and tube branch? In this instance, insulation will be applied, so the fixtures and receptacles previously on this circuit have been wired to a completely separate circuit of Romex. This is on a third floor, far away from the panel.
I had an electrician complete this work, but I’m not very confident in the mess of wires he left in the attic. What type of termination should I be looking for in order to feel comfortable proceeding with insulation?
Wires in cavity between roof and 3rd floor ceiling:

A wire nut can be seen in the open air

Ben Franske · Answer

I'd have to go double check my NEC before saying for certain, but my recollection is that unless specifically tagged for future use old wiring no longer in service is supposed to be entirely removed. Now, there is some question of the practicality of that when the wiring is not in conduit, etc. but I would suggest getting as much removed as practical before insulating. Getting rid of all of it would be best practice. You also want to be very sure that if any of it is still hooked up anywhere it does not get buried in insulation.

Answered by Ben Franske on July 17, 2021

How should an unused knob and tube run be terminated?

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