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Just been reading Trevor Marks and he points us to BS 7671 314-01-04 that is copied below. "Where an installation comprises more than one final circuit, each final circuit shall be connected to a separate way in a distribution board. The wiring of each final circuit shall be electrically...

Happy to go along with radials in length though this does not seem to change the principle of the statement. Agree completely that 'shouldn't really mix ring and radial' but have not yet found where BS7671 states that it's wrong. Circuit breakers are designed to take at least 2 cables and...

Following on from Andy’s guidance concerning lighting radials and the fact that it is the terminal design capacity, not directly BS7671, that determines the number of wires in a terminal, the following seems true: In a domestic consumer unit, with a single 20 Amp circuit breaker supplying...

Reg 314-01-01 Every installation shall be divided into circuits as necessary to: (i) avoid danger and minimize inconvenience in the event of a fault, and (ii) facilitate safe operation, inspection, testing and maintenance. IMHO I feel Andy is right if the installation is designed...

Page 149 of OSG states: The total number of fused spurs is unlimited but the number of non-fused spurs does not exceed the total number socket-outlets and items of stationary equipment. A non-fused spur feeds only one single or one twin socket-outlet or one permanently connected equipment...

I would greatly appreciate the forum members views on the following, as I would like to give customers accurate advice when finding an unusual number of phase wires in a circuit breaker: 3 phase wires can sometimes be found connected to a circuit breaker on a domestic consumer unit. One way...

Many Thanks for this info. Along with info from related posts across the site (such as using heatshrink, self amalgamating tape and good ratchet crimping pliers), I'm happy I've now got a good solution to using crimps. Happy Christmas to all.

Is the answer to my blue crimp question that manufactures simply don't specify the safe max operating current under the circumstances covered above? If that is the case, I guess I'll continue with using terminal blocks as I'd be just guessing that the blue crimp was OK. Any further light on...

Thanks for the info. Does anyone have a manufactures max design current for a blue crimp in a steel knockout box in a brick and plaster wall?

I phoned several crimp manufacturers and asked which of their products were certified to carry 32 Amps if used in a knockout box in a brick and plaster wall, would connect 2.5mm wire from a BS Twin & Earth cable and whose insulation was rated to 600V. No manufacturers I spoke to were able...