Fill large holes in lightweight concrete with electrical wiring?

[Bulten37]

I have removed a short protruding lightweight concrete wall and had to chisel large parts of it as I was unsure how the electrical wiring was routed. I need to remove a bit more to fit the switch. What should I use to rebuild the wall afterwards, mortar, plaster?

 

[Johan456]

You can repair with, for example, plaster mortar as long as it is not a wall that gets damp, meaning a wall below ground level.

 

[Bulten37]

Thanks for the response. Used gipsbruk and it worked really well to cover the holes.