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2.5 T+E and expanding foam.

Wearb · 2023-09-18 16:33:36

I was servicing an outside oil boiler today. On a previous service I'd mentioned about the large hole that the boiler wiring came through. Today I noticed it had been filled with expanding foam. This installation is over 20 years old. Did I read somewhere that expanding foam can degrade the wiring insulation?

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18-09-2023 5:33pm

#1

Wearb

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I was servicing an outside oil boiler today. On a previous service I'd mentioned about the large hole that the boiler wiring came through.
Today I noticed it had been filled with expanding foam.
This installation is over 20 years old.
Did I read somewhere that expanding foam can degrade the wiring insulation?

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#2 18-09-2023 6:24pm
10-10-20

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With polystyrene it's an issue...
https://electrical.theiet.org/wiring-matters/years/2019/78-november-2019/pvc-insulated-and-sheathed-cables-in-a-domestic-installation-some-possible-problems/
...not aware of it being a problem with urea based expanding foam other than where it's a thermal insulator.

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