Electrics behind dot & dab plasterboard

richyje

Hi,

I am planning a new extension. The Inside Block Work will be 100mm Thermalite Blocks and I was planning on having the internal walls drylined in the usual dot and dab technique. I was wondering how the electrics and plumbing are generally run behind this type of wall. Would the thermalite blocks be "chased out" and the electric cabling be installed in conduit ? or would it be acceptable to have the cabling run in conduit flush to the thermalite block itself ? ie in the gap between the plasterboard and the wall itself ?

Many Thanks,

Richard

paulpud

It is usual to run the cable on top of the block in the space between the block and plasterboard, with the cable protected by a channel fixed over it. To comply with current regulations the cable needs to be RCD protected as it will be less than 50mm from the surface.

sillygoose

paulpud wrote: »

It is usual to run the cable on top of the block in the space between the block and plasterboard, with the cable protected by a channel fixed over it. To comply with current regulations the cable needs to be RCD protected as it will be less than 50mm from the surface.

This is correct. There are also rules about the path the cables can be laid, certain distances from edges, no diagonals etc, its all to do with placing the cables on the 'expected' route. Perhaps a Sparks can advise on the basics?

paulpud

If the cable is terminating at a visible accessory such as a socket outlet or a light switch then the cable should be run in a straight line either horizontal or vertical to it.
If the cables are to be hidden with no obvious point of termination then they should be run in a straight line less than 150mm from the top of the wall or less than 150mm from the angle point where two adjoining walls meet (in the corner basically)

DVardysShadow

paulpud wrote: »

It is usual to run the cable on top of the block in the space between the block and plasterboard, with the cable protected by a channel fixed over it. To comply with current regulations the cable needs to be RCD protected as it will be less than 50mm from the surface.

I think I would use oval conduit - it makes a rewire easier.