If a circuit loops back on itself within a conduit (e.g. in and out of a socket drop or a switched live running alongside the unswitched live) do you count it as 1 or 2 for grouping?
The Regs refer to number of 'cables' for multicore and 'circuits' for single core. That would seem to mean you calculate the grouping factor differently for multicore and single core which would seem ... odd.
Alex
On Thursday 14 March 2013 10:44 Alexander Lamaison wrote in uk.d-i-y:
Normally, you count circuits as if there are 2 or more cables for a single circuit (eg lighting), then each cable cannot be fully loaded to the max for the circuit - only the sum of them can.
However, in the case of a loopback, treat it as 2 for grouping, expecially if it is the primary feed from the CU.
Grouping is about heating - step back from the regs and consider how the cables work from a heating point of view :)
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