I have bought MK Sentry Consumer Unit. I notice that the markings on the plastic for the cable entry cutouts are all rectangular. Having made cut-outs is it usual to use any sort of grommet or is it sufficient to smooth the cut edges of the unit.
(There will also be "gaps" adjacent to cable at entry point - ie unlike cable in a closed/blind grommet - where it would be possible - if unlikely - to "poke" in to the unit)