george [dicegeorge] wrote:
I'm knocking holes through walls to put wires through,
mains electric and ethernet.
I've been concreting in offcuts of round plastic drainpipe.
How would I seal these against smoke and fire?
Is there a better way to do it?
Someone said using metal would cause induction.

[g]

Keywords: intumescent, fireproof, silicone, firestop, foam, penetration.

e.g. http://www.screwfix.com/prods/56102/