chris French wrote:
TBH, I'm not sure I see the likelihood of the cable being damaged on the
plastic edge here as any greater than on a junction box, or plastic
mounting box where.

I'd tend to agree. Grommets for metal boxes are perhaps a different
matter, given the boxes are earthed, and cables might be squeezed into
them. This shouldn't happen with a CU.


I was a bit wary when I fitted an mk cu with no grommets - but I did all the
cutouts before mounting it on the wall and used a small file to
cleanup/smooth all the edges. The cables arent very tight fitting and arent
going to move so they should be alright?