- 27 Jan 2008
- Reaction score
- Llanfair Caereinion, Nr Welshpool
For an electrician that may be true, however DIY the plug in testerI always extend the ring on the basis it might need extending again at some point, e.g. in a kitchen. There's always the option of a spur if the ring is extended.
As to how to extend, I have found the LAP grid range good, either two independent sockets in one double socket face plate, or a socket switch and fuse in one double socket face plate, means either extending ring or adding a fuse can be done without need for crimped connections.
As to then adding more sockets, with fused spur that is not a problem.
As to radial the good point is less on each circuit, so any trip effects less items, but need three radials to replace a ring, and unless using RCBO's no advantage anyway, and if using RCBO's it gets expensive, specially if you need a new consumer unit to have so many circuits.
I do wonder if the people who sing the praises of radials actually measure or calculate the volt drop? 106 meters of 2.5 mm² or 40 meters of 4 mm² assuming Ib=26 amp. i.e. 20 amp at centre or end, and 12 amp even spread. OK ring because it returns likely longer so possibly only two radials for one ring, but drop to 2.5 mm² and 20 amp then only 32 meters. So to use 20 amp radials instead of 32 amp rings means 3 circuits so double row CU and much more expensive.