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 Post subject: what grommets do I need?
PostPosted: Fri Mar 01, 2019 1:37 pm 
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I purchased this surface mounted socket:
https://www.screwfix.com/p/13a-2-gang-s ... clad/69127

It does not come with grommets, but note that the knockouts on these are 20mm. I plan to wire it with this cable:

PRYSMIAN 6242Y TWIN & EARTH CABLE 2.5MM
https://www.screwfix.com/p/prysmian-624 ... tid=268718

As it will just have the one cable going to it, most of the grommets I have seen for sale will not hug the cable very tightly. As such, I wonder if I should just buy these:

SCHNEIDER ELECTRIC PVC GROMMET CLOSED PACK:
https://www.screwfix.com/p/schneider-el ... -100/18603

They are closed, but I could just make my own hole in them to fit the cable snugly. What would people suggest?


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PostPosted: Fri Mar 01, 2019 1:45 pm 
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The grommets aren't meant to 'hug the cable' - they are only intended to protect the cable from chaffing on the rough edges of the box. When the cable is installed it is unlikely to move anyway.

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PostPosted: Fri Mar 01, 2019 1:48 pm 
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tbh I would use some 2.5mm flex and a gland as your not using conduit, don't forget to earth the face and backbox

https://www.screwfix.com/p/tower-male-c ... of-2/45943

if you want to use 2.5mm T&E

https://www.screwfix.com/p/british-gene ... grey/8797p

Any reason for going with a metal clad backbox and socket ?



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PostPosted: Fri Mar 01, 2019 1:52 pm 
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kellys_eye wrote:
The grommets aren't meant to 'hug the cable' - they are only intended to protect the cable from chaffing on the rough edges of the box. When the cable is installed it is unlikely to move anyway.


I get what you are saying, but if there is too much of a gap, it does allow dust etc in. That's why I thought if I bought those closed grommets, I could just make my own hole in them to the perfect size


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PostPosted: Fri Mar 01, 2019 1:57 pm 
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Bob225 wrote:

Any reason for going with a metal clad backbox and socket ?



I just got that as it was the cheapest option. I wanted a surface fit socket, as I can't be bothered chasing into walls etc. I am not using conduit, and will just use these wall clips to secure the cable to the wall:

LAP CABLE CLIPS GREY FOR TWIN & EARTH CABLE 2.5MM PACK OF 100 (9302F)
https://www.screwfix.com/p/lap-cable-cl ... -100/9302f

It's only going in the garage, so am not worried about how neat it looks. I just need to make sure everything is safe.


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PostPosted: Fri Mar 01, 2019 2:10 pm 
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This looks like the thing for the job
https://www.screwfix.com/p/british-gene ... grey/8797p



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PostPosted: Fri Mar 01, 2019 6:15 pm 
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Lol Dave I did post that above

Adam. the medal clad socket is just the socket, the back box is a extra - SF's site can be misleading at times

https://www.screwfix.com/p/mk-logic-plu ... hite/15747 £3.85

https://www.screwfix.com/p/2g-surface-box/89406 £1.99



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PostPosted: Sat Mar 02, 2019 12:18 am 
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Bob225 wrote:

Adam. the medal clad socket is just the socket, the back box is a extra - SF's site can be misleading at times



Now you have me confused as it seems to come with everything - see picture:

Image


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PostPosted: Sat Mar 02, 2019 11:18 am 
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The link you give in your post states •Requires 25mm Back Box lol, As I said screwfix's site is hit and miss


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PostPosted: Sun Mar 10, 2019 6:18 pm 
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Dave54 wrote:
This looks like the thing for the job
https://www.screwfix.com/p/british-gene ... grey/8797p


Bob225 wrote:
tbh I would use some 2.5mm flex and a gland as your not using conduit, don't forget to earth the face and backbox

if you want to use 2.5mm T&E

https://www.screwfix.com/p/british-gene ... grey/8797p




I purchased that and it did the job well. Thanks for your help.



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