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Topic Title: Multiple cables in a single duct
Topic Summary: Running multiple cables within a single duct- de rating- Grouping- Cg?
Created On: 11 April 2013 04:34 PM
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 11 April 2013 05:01 PM
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Jaymack

Posts: 4479
Joined: 07 April 2004

Originally posted by: christophercarters
Does anybody have any experiance on this or know where I may find some valid guidance for de-rating? ERA perhaps?

Table 4B5 on P326 perhaps?

Regards
 14 April 2013 12:28 AM
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peteTLM

Posts: 3083
Joined: 31 March 2005

Hi Chris,

what size cables do you propose, what loadings are foreseable, what size is the duct?
Can they all be used at the same time?

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Lack of planning on your part doesn't make it an emergency on mine....

Every man has to know his limitations- Dirty Harry
 14 April 2013 07:57 AM
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Jaymack

Posts: 4479
Joined: 07 April 2004

Originally posted by: christophercarters
I want to install 6 No. BS5467 cables to a single duct. I therefore need a value for Cg... however this doesn't exist within BS7671.The regs only seem to allow the installation of one cable per duct (installation method 70)
Does anybody have any experiance on this or know where I may find some valid guidance for de-rating? ERA perhaps?

Give the cable sizes, types and quantities for someone to generously look up in the BICC handbook etc., or speak to a cable maker; but if you frequently carry out such cable installation, and as you are probably aware, current (sic) documentation is available by contacting the ERA service for cable consultancy, but you'll have to pay!

http://www.era.co.uk/
 16 April 2013 09:38 AM
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Jaymack

Posts: 4479
Joined: 07 April 2004

Originally posted by: christophercarters
Does anybody have acceess to a PDF BICC handbook by any chance?

DIY from the 1982 edition, and we know who to ask in the future! : -

http://www.ebay.co.uk/itm/B-I-...ok-Book-/190800338787?
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