Cables and expanding (ureathane) foam

[Jim Ingram]

Hi, Is expanding foam safe to use in contact with PVC sheathed cables?

Thanks

Jim

[sPoNiX]

I'd err on the side of caution.

PVC cable in contact with polystyrene tends to melt the polystyrene. I imagine it would do the same with expanding foam.

Perhaps worth calling/emailing the manufaturer of the foam and asking them?

sponix

[Rick]

You may have the issue that it will insulate the cables, and reduce their current carrying capacity. The expanding foam has quite a good U value.

Rick

[Andy Dingley]

Compared to the problem with PVC plasticisers damaging polystyrene foam, yes.

[John Rumm]

Yup... at least there is no leaching plasticizer pproblem. However you may need to apply derating to the cables current capacity if any length of it is buried in the insulation.