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PostPosted: Sat Dec 15, 2018 11:28 am 
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Hi.

I want to move the light switches in my house as I want to rehang the doors the other way ( ie the normal way!). And this would mean the switches would otherwise be behind the doors.

I went to do my first one today came across this honeycomb plasterboard. Never seen it before!

What would be the correct thing to do? Push a piece of conduit down from the loft to smash it's way through and then leave it there and thread the cable through?

If so what's the minimum size conduit for a single piece of 1.5mm t&e??

Many thanks!


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PostPosted: Sat Dec 15, 2018 11:41 am 
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Oh and also, in the loft does the cable have to be clipped to the joists for as much as the run as it can until laying over the plasterboard to reach the fitting etc or is that just good practice?


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PostPosted: Sun Dec 16, 2018 11:42 am 
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Andrew wrote:
What would be the correct thing to do? Push a piece of conduit down from the loft to smash it's way through and then leave it there and thread the cable through?


You can get several sizes of conduit, including flat which is meant to be used under plaster. However I doubt it would make a good "battering ram" so I would suggest 20mm black PVC conduit, but then the question is, how wide is this plasterboard wall, and how is the cable get to the switch as it is now?

Then again, if you did use it as a "battering ram" it may slip and come through the wall, time to buy a very long drill bit. (Nope, not joking, but would you have enough space above?)

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PostPosted: Sun Dec 16, 2018 2:16 pm 
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Hi mate.

It's in a new location. The old switch position looks like a bodge of sorts as the cable is coming from the side into the switch.

The honeycomb is just bits of cardboard so can be rammed through. But like you say it would be a bugger to get conduithe in there especially as there is a wood batten along the top. Perhaps just batter it through with something and then pass the cable down freely?


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PostPosted: Sun Dec 16, 2018 2:30 pm 
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Try and see.

If there is a batten at the top, drill a 20mm hole in and poke the T & E down, then from where the back box is going poke a coat haner up to "fish" the cable. (Obviously you un bend the coat hanger first and make a hook shape on one end)

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