Discuss Oval Grommets for 15mm boxes in the UK Electrical Forum area at ElectriciansForums.net

Don't the 20mm ones fit them, if you squish them? i.e. 16mm oval radius = 20mm circle radius

Alternatively, if the KOs are not really knock-outs, but with a sort of bent-over flange, which is smooth, I wouldn't bother putting a grommet on them, as there's no sharp edge
 
As #3, most have rolled edges. No need for grommit. And if you do use a grommit, the hole becomes too small to fit many cables in.
Only top entries are rolled, though. There are other, various knockouts too.

Remember...... for donkeys years they came with a slimline grommet?
 
Last edited:
I use a Wallace, I know it's late and I'm tired....................and my mind is working in a very strange way.

I always thought Grommet needed to go on a diet
 

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