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Topic Title: Trunking Spacing
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Created On: 03 June 2012 12:33 PM
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 03 June 2012 12:33 PM
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jdd

Posts: 1
Joined: 04 May 2012

Hi All,

Can anyone offer any advice on trunking spacing, ie. If there are x amount of cables in it currently, how can I work out out if I can fit additional ones in. (According to regs!)
 04 June 2012 03:20 PM
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johnboy6083

Posts: 31
Joined: 25 July 2008

The rule of thumb is 50%. If the trunking seems to be more than 50% full then I would use the cable and trunking factors in the OSG to work out if the trunking is sufficient for your needs or not. In practice however, the trunking is often rammed full.
 25 June 2012 10:02 AM
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alamatec

Posts: 73
Joined: 04 January 2007

Originally posted by: jdd

Hi All,



Can anyone offer any advice on trunking spacing, ie. If there are x amount of cables in it currently, how can I work out out if I can fit additional ones in. (According to regs!)


We use 40% and thats quite standard in a few industries.
 29 June 2012 04:58 PM
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Griffter

Posts: 1
Joined: 17 May 2011

Hello All,

I am in the process of setting up/designing a new cable management system, can anyone tell me where I can find the regs for trunking requirements.
Thanks
 29 June 2012 05:26 PM
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OMS

Posts: 19837
Joined: 23 March 2004

There are no specific regulations - just that the cables shouldn't be damaged by installing them (and that you account for grouping in terms of cable current carrying capacity)

as a typical value, you should aim not to exceed more than 45% of the trunking internal area

So, if you have say a trunking that's 100 x 50mm and has a wall thickness of say 1.0mm then the GIA is 4802mm2.

45% of that is = 2161mm2

If we say that a 2.5mm2 single insulated conductor has a diameter of 4.0mm including insulation, then the overall area is 12.6mm2

So, you could install 2161/12.6 = 171 No x 2.5mm2 XLPE insulated singles into the trunking

Does that help

Regards

OMS

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