Running cables from CU into trunking

Nothing wrong with intumescent sealant where the cables enter the CU (about £3.50 for a tube of Fire Mate at Toolstation.

As for the spacings of the clips. That's easy. Imaging the trunking just instantly disappears and then just fit the clips where you need them to keep all the cables roughly held up to the ceiling.

Just to clarify Adam, the last time I did something similar was a long time ago. Then I simply made holes in the side of the trunking matching the CU knockouts. Can I do the same but use intumescent sealant once the cables are passed through?

I think I might have slightly misread your question. I assumed (without thinking) that you were running the trunking up from the CU to the ceiling perimeter trunking and just using conduit on the drops to the sockets etc. If that was the case I would [1] use the largest bush and lock ring possible to fit inside the trunking as an entry point into the CU (and then fill the gaps with Fire Mate).

Your way is absolutely fine but harder work if you have several drops of conduit to the CU.

And yes you just fill the gaps either way when you are done.

Thanks for the advice Adam, I hope to make a start soon as get my other problem sorted - see Wanker Roofers.

Richard

Sorry for the OT, but where do you get grommet strip? Sounds great, I always used cut grommets, but they are clearly not ideal.

Electrical wholesalers.

It seems that Screwfix and Toolstation do not sell it.

TLC do one, just a matter of knowing what it is called. Thanks. Does anyone do rubber ones, or aren't they flexible enough for corners?

The one's I have used are pretty much the same. And you nearly always have to superglue it on.