jpadie Posted October 12 Share Posted October 12 I'm using some Screwfix surface mounted pattress boxes to add some sockets to a ring main in the garage. These are they. The manufacturer data that came with them says to use rubber grommets for the knockouts. But LAP don't make any such grommets and I've not idea how they would fit to the knockouts for flat cable. Any thoughts on these? Are they a regs requirement? Could I just fill the 1mm gaps around the cable with silicon or another filler? I think the plastic is far weaker than outer insulation on 2.5 t&e so I can't see abrasion being a big issue. Link to comment Share on other sites More sharing options...
Onoff Posted October 12 Share Posted October 12 I've never fitted grommets to that type. Just knock out and file down any sharp edges. 1 Link to comment Share on other sites More sharing options...
Chanmenie Posted October 12 Share Posted October 12 Those boxes are not designed to have grommets 1 Link to comment Share on other sites More sharing options...
FuerteStu Posted October 12 Share Posted October 12 If they are round knockouts, you could use a stuffing gland for cable entry. Far cleaner looking, and at least helps the ip rating Link to comment Share on other sites More sharing options...
Onoff Posted October 12 Share Posted October 12 1 hour ago, FuerteStu said: If they are round knockouts, you could use a stuffing gland for cable entry. Far cleaner looking, and at least helps the ip rating They're these: Hilarious that the LAP instructions say to use rubber grommets. LAP btw are a Kingfisher (they own Screwfix), own brand. Link to comment Share on other sites More sharing options...
FuerteStu Posted October 13 Share Posted October 13 19 hours ago, Onoff said: They're these: Hilarious that the LAP instructions say to use rubber grommets. LAP btw are a Kingfisher (they own Screwfix), own brand. Absolutely despise these patresses. Crumbly sharp cable entry points, the slightest knock and they crack.. Even mounting on an uneven surface and tightening the screws can cause them to implode! Link to comment Share on other sites More sharing options...
G and J Posted October 13 Share Posted October 13 1 hour ago, FuerteStu said: Absolutely despise these patresses. Crumbly sharp cable entry points, the slightest knock and they crack.. Even mounting on an uneven surface and tightening the screws can cause them to implode! +1 With a passion. Link to comment Share on other sites More sharing options...
jpadie Posted November 7 Author Share Posted November 7 job is done, but i am eager to learn - what pattresses (for surface applications) are less hated? Link to comment Share on other sites More sharing options...
ProDave Posted November 7 Share Posted November 7 The PVC ones usually sold as "conduit back boxes" They are a softer plastic that won't break they will just bend a bit. Usually have a knock out for 20mm round conduit or small mini trunking, and in any case can be drilled, sawn or filed for any other cut out you want. Link to comment Share on other sites More sharing options...
jpadie Posted November 7 Author Share Posted November 7 6 minutes ago, ProDave said: The PVC ones usually sold as "conduit back boxes" They are a softer plastic that won't break they will just bend a bit. Usually have a knock out for 20mm round conduit or small mini trunking, and in any case can be drilled, sawn or filed for any other cut out you want. superb. will look out for them and maybe even swap them out the next time I have a free Sunday. I didn't like the jaggedy edges of the last lot either! Link to comment Share on other sites More sharing options...
Onoff Posted November 7 Share Posted November 7 1 hour ago, jpadie said: superb. will look out for them and maybe even swap them out the next time I have a free Sunday. I didn't like the jaggedy edges of the last lot either! This sort of thing. PVC, will pass the drop test etc: https://www.toolstation.com/pvc-conduit-pattress/p53404 Link to comment Share on other sites More sharing options...
joe90 Posted November 7 Share Posted November 7 Personally and in my garage I use metal back boxes and plastic conduit to at least head height, some might say it’s OTT but it looks so much neater… 🤷♂️ 1 Link to comment Share on other sites More sharing options...
jpadie Posted November 7 Author Share Posted November 7 very neat @joe90. in my garage the sockets are on the roof joists as the walls are all taken up with racking. wiring is stapled to the joists or through the air (above head height) when traversing. Link to comment Share on other sites More sharing options...
jpadie Posted November 7 Author Share Posted November 7 1 hour ago, Onoff said: This sort of thing. PVC, will pass the drop test etc: https://www.toolstation.com/pvc-conduit-pattress/p53404 perfect. many thanks! Link to comment Share on other sites More sharing options...
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