Help me identify this insulation type!

[MrJLH]

Can I get some help identifying this identified cable insulation type? My drawings say 2 per phase 500 KCMIL THW, but I'm pretty sure this insulation is not THW. All I need to do is figure out what my de-rated ampacity is. Should I just use the 60°C column?

Thanks

 

[infinity]

Looks like a rubber insulated conductor like RHW because it does not appear to be thermoplastic like THW.

 

[ActionDave]

That's not THW, it's not even TW. I tore some wire out that looked like that out of an old airplane hangar built in the fifties that looked like that. It was cloth or cambric over rubber. I wouldn't go any higher than the 60 degree scale.

 

[ptonsparky]

I would suggest not even moving it. You can probably hear the insulation crack when you do. We replaced every foot of it in a 50's built Hay Mill. and I think every foot of it cracked.

 

[junkhound]

how old are the original feeders? If old, might be tarred linen or even cotton, but would probably show cracks if that. .

Think the RHW already mentioned is likely correct answer.

 

[synchro]

how old are the original feeders? If old, might be tarred linen or even cotton, but would probably show cracks if that. .

Think the RHW already mentioned is likely correct answer.

It might also be RH which is not water resistant.

A list of wire types from about 50 years ago: