Hello
My question is regarding table 4C1 in BS7671
Grouping factors.
A ring final circuit is this a circuit or two multi core cables?
So a ring final has
So a ring final has
Two multicore cable (legs) which will be 2.5mm2 T&E cable.
And..
It is one circuit, usually 32A MCB, what is the arrangement
So table 4C1
So table 4C1
If we used item 1 bunched in air, on a surface, etc.. would the ring final be classed as arrangement 1 (Factor 1.00) one circuit
Or arrangement 2 (2 multicore cables factor 0.80)
If a ring final is two multi core cables and not one circuit, that would follow that 2 ring final circuits (4 multicore) would have a
factor of 0.65 which is quite some derating.
Many thanks
John