Electrical applications - electrical circuits - ring and radial (UK)?

for ring and radial please state;





a) the maximum number of sockets allowed for a permitted floor space.





b) the maximum fuse rating, which can be used.





c) minimum conductor size.





d) explain the types of cables that can be used.





e) the maximum number of fuse spurs allowed on a ring main circuit.

Electrical applications - electrical circuits - ring and radial (UK)?
All this information is in the 16th edition. you need to consult it because there are not easy answers to your questions.





a) One ring up to 110 square metres, radial areas are smaller and depend on wire size.


b) Depends on wire size


c) Depends on fuse/breaker size


d) depends on location


e) One spur for each socket on the ring (not sure what you mean fuse spur as this is a type of outlet and you can put as many as you want if they are in the ring)
Reply:In the US, the answers are:


a: No limit.


b: 20 amperes. British practice would probably be less, as 240 volts is used there.


c: 12-gauge for 20 amp fusing; 14-gauge if 15 amps.


d: NM cable with ground is standard in residential construction in the US. In industrial applications, armored cable or metal conduit is required.


e. No limit.