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So just to clarify I presume when you say my 2nd diagram is correct (think I got a mind blank today and thought it was wrong), i assume the current would travel like this (in red): 2.5mm cable not affected by rads in use: And not like this:

Wow, I've missed all the excitement :mrgreen:, I've got some reading up to do. Well, this is what I think but please correct me if I'm wrong (I'm sure I probably am anyway): CU > A = Circuitry A > B = Spur B > C = Spur A > D = Branch D > E = Spur B > F = Branch I was thinking that...

Just off the top of my head, I think I've got diagram 2 wrong. I don't know what i was thinking. Surely it doesn't make it any better to have 2.5mm after 4mm because the current will still run from the 4mm through to 2.5mm, therefore overloading it. Very true, the key is which circuit breaker...

Thanks ban-all-summerhouses, *cough cough*, I mean ban-all-sheds :mrgreen: They are something I'd be very interested in reading, although I'll probably buy them off ebay as they might be a little cheaper and will get them used. One of them is £70! That's crazy :shock: I'd get this one...

But in life we never stop learning :). RF Lighting thanks very much! Very informative; clears everything up. EDIT: Ah, just reread this and wondered, so you'd make a fused spur in 4mm2 off the 2.5mm2 cable? If you get chance to see this and reply, thanks in advance

Sorry for late reply sparkies 8) (Diagram was based on 230V supply) Depending on the installation method?? I assume you mean clipped?? I read 4mm² was 25A? Is there anywhere on the net I can get exact figures? Now a 32A mcb would be useless in this diagram as it would not protect the...

75m². I know. But you didn't answer my question :(.

Am I right in assuming that in this particular radial circuit, the 25A cable would be more than capable of taking the load of the two electrical radiators except that the 20A cable would sizzle as the radiators are at the end of the circuit after the 20A cable? If the circuit was wired as shown...

Great, thanks for clearing that up for me guys. Just got 1 more question but will post in separate thread

[/url] Well that's sort of what i thought until i saw this: And this is now why I'm confused :shock: Unless maybe this applies to a different country or for a certain accessory I don't know.

Is it done like this above? If not, then why because I would have thought this would have been the most sensible way? All I've ever seen is the cable being run like this which i would have thought would have been more likely to be drilled through: