Canadian regs of old

[Harry Bloomfield]

I had a friend around, last evening, presently living in Canada. He's busy renovating an old house there for himself, and the chat got around to old wiring, in Canada, and how they used to do it. He was saying that the wiring was done on the past, with uninsulated/bare copper, under floor, with ceramic tubes, just where it passed through timber, etc..

 

[plugwash]

My understanding was that the wire used in "knob and tube" was insulated, but only with a single layer, which noone realy trusted (and may have degraded to nothing by now). The "knobs" and "tubes" then effectively provided a secondary insulation.

 

[robinbanks]

Knob-and-tube wiring - Wikipedia

en.m.wikipedia.org

Not sure the wiring always started out as uninsulated, but the sheathing would degrade

 

[bernardgreen]

Much of the first generation of indoor wiring was installed by people familiar with outdoor telegraph wiring where "naked" copper or steel was the favoured conductor

 

[Harry Bloomfield]

My understanding was that the wire used in "knob and tube" was insulated, but only with a single layer, which noone realy trusted (and may have degraded to nothing by now). The "knobs" and "tubes" then effectively provided a secondary insulation.

The 'knob and tube' was what my friend described it as.

Knob-and-tube wiring - Wikipedia

en.m.wikipedia.org

Not sure the wiring always started out as uninsulated, but the sheathing would degrade

Thanks, an interesting read.