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26-05-2016 #9
OK, to clarify:
Cg represents the derating factor for grouping cables.
A cable with a current rating of 6 amp installed in trunking alongside other circuits, that's circuits not cables!, would now have a Cg value, the Cg value is 0.57.
This means the cable current rating becomes: 6 x 0.57, that's 3.42 amp.
To add to this, you should note that the grouping factors are based on assumption, the assumption that all of the cables in the group are carrying their rated current.
So, if however a cable is not going to be carrying more than 30% of its grouped current rating, that cable can actually be omitted from the group rating calculation...
...an example, if you've got lets say 6 circuits in a group of cables but 1 of those cables is known to be operating below the said 30% consistently, you can safely calculate the group on the basis that it only consists of 5 circuits.
Here are some correction factors for multicore cable:
OK Clive, how did I do?
.MeLast edited by Lee Roberts; 26-05-2016 at 10:50 AM.
.Me
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