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Discuss 20mm pvc box with side knockouts. in the UK Electrical Forum area at ElectriciansForums.net

decent step drill bit, and make sure the boxes you buy have a decent thickness to them and not thin brittle ones. then use the step bit to create the holes. a careful positioning will alleviate most problems. if you can use a t square and make pilot holes to keep them in uniform position
 
Hi - something like these?
PVC Box - https://www.toolstation.com/pvc-box/p53404

IMG_1291.JPG
 

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