On 03/03/2018 21:04, alan_m wrote:
On 03/03/2018 13:25, RJH wrote:
I'm looking to route some appliance cables (microwave, lights, radio
etc - I'll keep it to 13A max though - the feed is to an extension
block) through the kitchen worktop to tidy things up and free up
sockets above the counter. The grommet would be out of sight - behind
the microwave for example.

I bought one of these 80mm, just to see:

https://www.ebay.co.uk/itm//321759119678

It's fine, but a bit flimsy - the cover could pop off quite easily.
And possibly 60mm would do it.

If you take/cut off the plugs you just have to be able to poke the wires
through a very much smaller hole. Use a bit of waste pipe or plastic
electrical conduit. It comes in various diameters but 32mm or smaller
may do. Drill the hole, seal the cut with external use PVA, insert the
pipe leaving it proud of the work surface by, say, 15mm, silicone around
the pipe to provide a waterproof seal to stop water dripping down the
hole/cable when cleaning the worktop, let everything dry/cure, feed the
wires through the pipe and re-attach the plugs.




But moulded-on plugs are *much* more reliable, especially for high load
appliances like washing machines, dishwashers, and tumble dryers.