Schneider Electric 4-Entry Junction Box with Knockouts Grey 65 x 65 x 45mm (63295)

Thank you for your inquiry. The Schneider Electric 4-Entry junction box knockout hole diameter is 20mm.

Thank you for the enquiry these are easy access cable entries that pop out

It's easy to see where confusion may come from... Screwfix catalog these as 'Schneider Electric 4-Entry Junction Box with Knockouts Grey 65 x 65 x 45mm' and print (essentially) the same on the infamous sticky label (don't blame Schneider for that gooey label). However, these are mis-labelled !! If you want a grey 65 x 65 x 45mm box WITH 16/20MM KNOCKOUTS then Schneider do those, ref ENN05082. What you are actually getting here is what Schneider list as ref ENN05002 'junction box with grommets'. I measure the holes as 22.7-ish mm, but the grommets do have a 20mm cutout - however, the thickness of the grommet precludes the use of a normal 20mm gland through the grommet due to insufficient thread for the backnut. But, you could either just push conduit through the grommet as 'NeilVP' said, or, if wanting to use a 20mm gland or whatever just position it centrally. It's iffy whether its IP rating is met by a badly-aligned 20mm fitting in the ~23mm hole (but it's a very close call). Just to complicate matters, there ARE two 16mm knockouts in the back of the box, so everyone's somewhat right... As an aside, I like the fact that caps are supplied to seal the heads of screws if used for mounting, so preserving IP55 rating. A lot for little money.

These boxes are designed for more industrial environment the ingress protection is IP55 Protection against quantities of dust that could interfere with satisfactory operation and protection against jets of water from all directions

Thank you for your inquiry. The 4 entry junction box is not supplied with terminal blocks.