Hi Jenetthefarm,
The requirement for a deep box on 45A switch plates isn't due to the dimensions of the plate itself but rather the turning radius of 45A rated cable, which is significantly larger than that of more regular rated wiring, so the cooker control unit would happily sit on a 25mm box (but the wiring would potentially not be able to turn into the terminals on the rear without being broken).
If your electrician is happy that there is sufficient turning space for the particular cable being used then we would not argue against this.
Answered by: Luceco Technical Team
Date published: 2022-01-24