Most new lights I've installed say wiring must be rated 90 degrees.
When I've droped an old over bulbed fixture connected to knob and tube in the past...the wires insulation is so dryed out it crumbles and falls off if you move it at all.
Also I've found that most of a floor will be wired on 1 or 2 circuits at best...so if you kill one lighting circuit it may require rewiring many lighting outlets.
Also does'nt article 250 say I must ground the newly installed fixture?
What is your experiance with Knob and Tube???
shortcircuit
