Wiring – How to make channels in plaster for electric lines


Most of my walls consist of solid plaster over masonry, which makes electrical work difficult to say the least. I want to add some wiring to an existing wall in order to add light fixtures to a room which currently lacks them. Since there are no stud bays to run wires, I will need to cut channels in the plaster to run armored cable or conduit.

What are the best tools and techniques for accomplishing this?

Best Answer

Channelling chisel on SDS drill.

enter image description here

For short runs a brick bolster works reasonably well (and produces much less dust)

enter image description here

Deeply scoring the plaster with a knife beforehand to define the edges of the channel may help to prevent large irregular chunks being removed.