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Topic Title: Survey of KO boxes
Topic Summary: Depth of fixed lug
Created On: 19 November 2012 06:26 PM
Status: Post and Reply
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 19 November 2012 06:26 PM
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perspicacious

Posts: 7236
Joined: 18 April 2006

I'd appreciate feedback from those able to do so, of how far back (as near as you can measure) from the front face the top of the fixed lug is, in a BS 4662 double 35 mm KO box
Thanks to a kind responder, I do have the figures from the BS but would like to know what is typical and what brand please.

To start it off:

Brand Depth
Newlec 4.7 mm
? ?
? ?

All will be revealed later

Thanks

BOD
 19 November 2012 07:43 PM
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weirdbeard

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Must admit I am intrigued as to the survey purpose but sorry I can't help as I have mislaid or its been nicked, my digital verniers
 19 November 2012 08:05 PM
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aligarjon

Posts: 2849
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i'll have a look tomorrow but i do remember having an issue with some slimmer style sockets with back boxes supplied by Denmans 2 or 3 years ago. Basically the back of the sockets were fouling the box lugs stopping them going back flat against the wall.

Gary

-------------------------
Specialised Subject. The Bleedin Obvious. John Cleese
 19 November 2012 08:14 PM
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John Peckham

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Norslo 3.94mm and GET 5.23 mm

-------------------------
John Peckham

http://www.astutetechnicalservices.co.uk/
 19 November 2012 08:26 PM
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perspicacious

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Spot on Gary..... So much for fitting the KO boxes flush so that the plasterer doesn't fill them or leave them looking like the edges of a pasty which, when knocked off, crack the skim. But, back to the OP, are the majority of KO boxes made to the BS nominal or are some set back to the max permitted?

Is the accessory manufacturer relying on the installer breaching BS 7671 in some installations by setting the box way behind the front plane? If so, does the accessory comply with its own BS?

Regards

BOD
 19 November 2012 08:55 PM
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Zs

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Bod, what is the BS nominal?

And how are you guys measuring to a .01mm? my tape measure doesn't do that. I reckon you're making it up

Appleby...about 5 BOD.

Zs
 19 November 2012 09:00 PM
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sparkingchip

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Yes and they put it in writing as well.

"Flush back boxes must be at least 5mm below the surface of the wall"

I'll see if I can find it online and post a link.

Andy
 19 November 2012 09:08 PM
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John Peckham

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Zs

Making it up indeed! No us professionals use precision instruments, in this case a digital vernier. Cos me numbers have rubbed off me ruler at the small numbers end.

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John Peckham

http://www.astutetechnicalservices.co.uk/

Edited: 19 November 2012 at 09:14 PM by John Peckham
 19 November 2012 09:09 PM
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perspicacious

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"Flush back boxes must be at least 5mm below the surface of the wall"

Bit late to tell me now!

How do you set back a dry lining box?

Regards

BOD
 19 November 2012 09:12 PM
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perspicacious

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"Bod, what is the BS nominal?"

5.0 +4.0 -1.0 giving a range of 4 mm to 9 mm back from the front plane.

Regards

BOD
 19 November 2012 09:14 PM
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slittle

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Originally posted by: perspicacious

"Flush back boxes must be at least 5mm below the surface of the wall"



Bit late to tell me now!



How do you set back a dry lining box?



Regards



BOD


Fit it between the sterling board and the plasterboard of course


Stu
 19 November 2012 09:17 PM
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sparkingchip

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Volex catalogue bottom of page 41 flat plate fittings

http://storage.electrika.com/f...index.html#/41/zoomed

It is also important to take out any north/ south (top/bottom) lugs as they may short out onto terminals resulting in a big flash and a bang.

Andy
 20 November 2012 06:55 AM
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ebee

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Originally posted by: Zs

Bod, what is the BS nominal?



And how are you guys measuring to a .01mm? my tape measure doesn't do that. I reckon you're making it up



Appleby...about 5 BOD.



Zs



ZS,
Surely you have a depth micrometer or at least a vernier caliper with a depth rod on it? or you could compare it using a 0 to 1" (0 to 25mm) micrometer caliper gauge that you use to measure csa of cables with.



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Regards,
Ebee (M I S P N)

Knotted cables cause Lumpy Lektrik
 20 November 2012 08:46 AM
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Cremeegg

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MJA 5.5mm
 20 November 2012 06:59 PM
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aligarjon

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Originally posted by: sparkingchip

Yes and they put it in writing as well.



"Flush back boxes must be at least 5mm below the surface of the wall"



I'll see if I can find it online and post a link.



Andy




LOL do you want to tell the plasterer that one.

Gary

-------------------------
Specialised Subject. The Bleedin Obvious. John Cleese
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