Supply
PME earthing
Earth loop imp < 0.8ohm
Capacity 15kva
Max prospective short circuit current 16kA
50 hertz frequency
Lounge and Dining Room
Ring circuit 32A
MCB protected
Circuit length – 42m
Floor area – 23m sq
10 double sockets on ring
1 double socket on short spur (20 cm through single layer terracotta block wall not shown)
RCD protected
The circuit
Key for diagram
A - Behind plasterboard on surface of insulation < 100mm
B - In PVC conduit laid in floor concrete
C - Attached to joist (insulation > 100mm)
D – Under PVC shield in wall rendering
My copy of onsite guide is giving me a cable size of 6mm sq, yet from my previous experience I would have thought 2.5mm sq. for a standard circuit like this. Am I interpreting the tables wrong ?
PME earthing
Earth loop imp < 0.8ohm
Capacity 15kva
Max prospective short circuit current 16kA
50 hertz frequency
Lounge and Dining Room
Ring circuit 32A
MCB protected
Circuit length – 42m
Floor area – 23m sq
10 double sockets on ring
1 double socket on short spur (20 cm through single layer terracotta block wall not shown)
RCD protected
The circuit
Key for diagram
A - Behind plasterboard on surface of insulation < 100mm
B - In PVC conduit laid in floor concrete
C - Attached to joist (insulation > 100mm)
D – Under PVC shield in wall rendering
My copy of onsite guide is giving me a cable size of 6mm sq, yet from my previous experience I would have thought 2.5mm sq. for a standard circuit like this. Am I interpreting the tables wrong ?