knob and tube

Is this a version of knob and tube?

The wires are insulated.

sept29 005a.jpg

Yep. That would be an “open-conductor support.”


How much of an issue is the insulation packed around it?
I would think it would contribute to conductor overheating.

It’s not allowed. I would say that it’s a “substantial” issue which should be corrected.

**394.12 Uses Not Permitted. **Concealed knob-and-tube wiring shall not be used in the following:

(5) Hollow spaces of walls, ceilings, and attics where such spaces are insulated by loose, rolled, or foamed-inplace insulating material that envelops the conductors