Spray foam on cables

JL spark

Can any one show me a link to a Reg about spray foam on cables trying to convince a customer that the foam needs going in first ,

thanks

meercat

https://www.boards.ie/discussion/2058220352/spray-foam-on-cables

522.0 should cover it

too long for me to type out. Sorry

meercat

JL spark

https://www.boards.ie/discussion/comment/118241782#Comment_118241782

Thanks for that , he has my head wrecked, Plummer telling him I’m talking **** too ,

joys of self employment 🙈

the_pen_turner

https://www.boards.ie/discussion/comment/118241782#Comment_118241782

surely the spay foam increases the protection against most of those.

is the foam corrosive

iioklo

Foam in contact with the cable's insulation causes a process called Plasticiser Migration, the foam draw's out the plasticiser from the Cable's insulation which over time causes the insulation to become brittle and crack, this potentially could allow the wires to arc and cause fires.

Also Wires under load heat up, if the wires are surrounded by foam insulation, they could heat up to greater temperature's, and potentially could melt the insulation and again start fires.

2011

Agreed, the current carrying capacity of cables imbedded in insulation need to be derated.

PilotHole

Sounds like a job/customer you don't need.

I thought that the foam sh1te goes on the underside of the roof?

I've heard is a waste of money too but thats another story.