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ricm
Junior Member
Joined: 21 Mar 2008
Posts: 15
Location: Sheffield
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 Posted: Sun Nov 09, 2008 10:53 am Post subject: Appropriate sizes for Capping and Back Boxes |
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Hi,
Short & sweet question for a change... Need to order some parts.
Best size (depth) galvanised back boxes for power sockets, fused connection unit, data grids, light switches?
Best size (width) galvanised capping for two x 2.5mmsq T&E for power, one x 2.5mmsq for spurs, two x 1.0mmsq for 2-gang lighting?
Should back boxes now be fitted with grommets after punch-out?
Thanks,
Ric
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IDontBelieveIt
Approved Electrician
Joined: 29 Jul 2008
Posts: 1192
Location: North Hampshire
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| Posted: Sun Nov 09, 2008 1:30 pm Post subject: |
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Nothing less than 25 mm for backboxes.
50 mm for capping over 2 x 2.5 t/e
Grommets are not a requirement to BS7671 but are good practice, all decent sparkys fit them.
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Rich-Ando
Approved Electrician
Joined: 24 Mar 2007
Posts: 2617
Location: Derby, Derbyshire
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| Posted: Sun Nov 09, 2008 1:43 pm Post subject: |
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be careful when deciding which boxes to use though, if you use the deep ones there is a chance you will knock the bricks right through if you are not used to chopping them out.
fully agree with IDBI on the grommets, use them cos you would be surprised how many people cut through the insulation when they cram the socket fronts back on 
capping, i never use the stuff myself, i find it dam annoying. it gives a week spot for plaster, it doesn't protect the cables from anything other than a plasterer hitting the cables with a trowel. that is the only reason it was used on building sites.
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IDontBelieveIt
Approved Electrician
Joined: 29 Jul 2008
Posts: 1192
Location: North Hampshire
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| Posted: Sun Nov 09, 2008 2:06 pm Post subject: |
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lol Rich - know what you mean about capping or is the blooming capping nails that are the problem? I HATE capping nails and don't use them I prefer to use galv clout nails. Actually I prefer not to use capping at all and hardly do these days spreads are OK at doing their job generally speaking.
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Rich-Ando
Approved Electrician
Joined: 24 Mar 2007
Posts: 2617
Location: Derby, Derbyshire
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| Posted: Sun Nov 09, 2008 4:06 pm Post subject: |
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i do all my own plastering so i know i don't have to use it 
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ricm
Junior Member
Joined: 21 Mar 2008
Posts: 15
Location: Sheffield
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| Posted: Sun Nov 09, 2008 7:26 pm Post subject: |
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So if you don't use cappings how do you fix cables into the channel?
Ric
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ultimatehandyman
Site Admin
Joined: 16 Jul 2005
Posts: 9740
Location: Darwen, Lancashire
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Stoday
Electricity economics consultant
Joined: 20 Jan 2006
Posts: 3227
Location: Sitting on the Bog
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| Posted: Mon Nov 10, 2008 3:33 am Post subject: |
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What a good idea UHM. And all these years I've been trapping cables under the heads of clout nails...
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Steve the Gas
Senior Member
Joined: 30 May 2008
Posts: 794
Location: Notts/Derbys
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| Posted: Mon Nov 10, 2008 6:04 am Post subject: |
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ricm
Junior Member
Joined: 21 Mar 2008
Posts: 15
Location: Sheffield
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| Posted: Mon Nov 10, 2008 7:51 am Post subject: |
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OK,
I only ever used clips before for surface mounting along joists and blockwork.
Thanks guys.
Ric
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IDontBelieveIt
Approved Electrician
Joined: 29 Jul 2008
Posts: 1192
Location: North Hampshire
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| Posted: Mon Nov 10, 2008 8:00 am Post subject: |
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| Stoday wrote: |
What a good idea UHM. And all these years I've been trapping cables under the heads of clout nails...
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Twit - I was referring to the fixing of capping.
Do you ever offer any serious and correct answers Stoday or is it permanent one-upmanship with you at all times?
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