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Topic Title: Cable Tray Stacking
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Created On: 06 August 2014 08:15 AM
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 06 August 2014 08:15 AM
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kumarm

Posts: 5
Joined: 12 November 2013

Is there a BS code reference to the minimum allowable distance that a cable tray must be installed when placing the new tray system on top of another existing tray system? (i mean stacking)
 06 August 2014 08:50 AM
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timothyarnold

Posts: 91
Joined: 12 January 2012

Hi Kumarm

There is some guidance in Table 4C4 of BS7671 and suggests a minimum of 300mm however please note that it also states that the existing and new cable current carrying capacity will need to be de-rated as the ventilation is significantly reduced (depending on the number of cables, configuration etc).

To make life easier I would avoid stacking if you can!

Thanks
Tim
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