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Topic Title: 528.2 Proximity to communications cables
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Created On: 21 April 2013 09:48 AM
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 21 April 2013 09:48 AM
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milenh

Posts: 2
Joined: 20 April 2013

Hello all,
could someone check the BS7671:2008 Wiring Regulation (green book) -528.2 Proximity to communications cables

Onsite Guide(green) states that minimum separation distances of 50 mm need to be maintaned (page75/76 table 7.4.2)
online electricaltrainingcourse.co.uk states that 100 mm is required
sorry,I can not post pictures and links here
I will be appreciated if someone help me to clear this issue

Thanks

Edited: 21 April 2013 at 10:00 AM by milenh
 21 April 2013 10:19 AM
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slittle

Posts: 3559
Joined: 22 November 2007

2011 book says 100mm


Stu
 21 April 2013 10:32 AM
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milenh

Posts: 2
Joined: 20 April 2013

10x Stu
 21 April 2013 10:35 AM
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bajb

Posts: 569
Joined: 20 November 2002

I only have 7671 to hand rather than the current OSG.
Are you comparing like with like?
528.2 refers specifically to underground powercables and underground telecoms cables.
Is the OSG making a more general unreferenced recommendation for use above ground, say internally?
 21 April 2013 10:42 AM
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alanblaby

Posts: 389
Joined: 09 March 2012

528.2 is for underground cables. Note 2 refers to BS6701.

7.4.2 in the OSG is the one we are mostly concerned with, which gives the recommended minimum of 50mm, which is taken from BS6701:2004
 22 April 2013 01:42 PM
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gkenyon

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Joined: 06 May 2002

These distances are for safety only, or other requirements for external services (e.g. BS6701).

There may be additional (or lesser in some cases) separation distance requirement for electromagnetic compatibility, regardless of whether the comms cables are external service. See A444.4 (P107 in the June 2011 Green Book version of BS7671).

Of course:
(a) Safety provisions take precedence, i.e. make sure you're above all minimum requirements for safety;
(b) Normally, greatest separation distance of all the requirements is that chosen.

-------------------------
Eur Ing Graham Kenyon CEng MIET TechIOSH
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