05-11-2017, 10:43 AM
(This post was last modified: 05-11-2017, 10:44 AM by ppppenguin.)
Radial circuits feeding sockets are a standard arrangement and have been since at least the 14th ed regs. Before rings they were the only arrangement. Either 20A breaker with 2.5mm cable or 32A breaker with 4mm cable. It''s possible that rings will be abolished in the 18th ed regs and it will be radials only.
Having a pseudo ring between 2 dist boards is obviously nasty. I once encountered something similar where 3 rings had been scrambled at the fusebox and you had to trip 3 MCBs to deaden them.
While many of us use neon screwdrivers and voltsticks, they don't guarantee safety. You need a proper test lamp (Drummond lamp) for that. I admit that I'm guilty of this crime quite often, but usually on installations with which I'm familiar. I also make sure that the neon screwdriver is in good condition and that both it and the voltstick are proven working by touching them to a known live cable.
Golden rule: Never assume a circuit is dead just because you've switched off, tripped the breaker, pulled the fuse etc. Prove it before touching. Similar rule applies to radio and TV mending too. Pull the plug before touching something potentially hazardous - a visible break in the circuit is good proof that it's not live. Apart from stored charge
Having a pseudo ring between 2 dist boards is obviously nasty. I once encountered something similar where 3 rings had been scrambled at the fusebox and you had to trip 3 MCBs to deaden them.
While many of us use neon screwdrivers and voltsticks, they don't guarantee safety. You need a proper test lamp (Drummond lamp) for that. I admit that I'm guilty of this crime quite often, but usually on installations with which I'm familiar. I also make sure that the neon screwdriver is in good condition and that both it and the voltstick are proven working by touching them to a known live cable.
Golden rule: Never assume a circuit is dead just because you've switched off, tripped the breaker, pulled the fuse etc. Prove it before touching. Similar rule applies to radio and TV mending too. Pull the plug before touching something potentially hazardous - a visible break in the circuit is good proof that it's not live. Apart from stored charge
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
