Sam Van horn
New member
I have a water damaged home with Knob and Tube wiring. The cloth insulation was wet yet the insurance company states that no damage was done to the wiring. Any comments or areas I could look to set them straight.
Put that wet K&T in wet blown in insulation and you have a problem that can extend all through the house. I found a house with the screen door energized due to that combination. It was donated to the fire dept.
My understanding is that K+T should NEVER be insulated. It needs to be able to dissapate its heat
Insulation is not really an issue unless you are using Table 310.17 for the overcurrent protection sizing. Original installations of K&T often used those ampacities.My understanding is that K+T should NEVER be insulated. It needs to be able to dissapate its heat
Insulation is not really an issue unless you are using Table 310.17 for the overcurrent protection sizing. Original installations of K&T often used those ampacities.
I am too. When K&T was originally installed it was often used at the free air ampacities and was protected at those ampacities. I think at the time of a lot of the original K&T installations, you could use a 25 amp fuse on #14 in free air.I think they are talking about house insulation, not wire insulation.
Look at 394.12 (5)
I am too. When K&T was originally installed it was often used at the free air ampacities and was protected at those ampacities. I think at the time of a lot of the original K&T installations, you could use a 25 amp fuse on #14 in free air.