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Adding lighting points is notifiable if either: 1) a new circuit is involved or 2) a "special location" or kitchen is involved or 3) a "special installation" is involved. "Special installations" include, amongst others: "Extra-low voltage lighting installations, other than...

It's all rather academic. The work is notifiable because it involves 12V lighting.

Doesn't that only apply to a circuit that is using the protective measure of electrical seperation? Otherwise you couldn't have both circuits terminated in the same CU without having barriers!

Have you got a regulation number for that requirement???

BAS, I'm surprised you haven't spotted that this work is notifiable as it involves a special installation, namely extra low voltage lighting. (Unless it is a pre assembled, CE marked set, with plug and socket connections.)

I think you'll get a better response in the plumbing and central heating area of the forum.

I'd guess it's probably not an circuit breaker, but an RCD. That would imply one of three causes: Faulty RCD Faulty Wiring (Insulation fault) Faulty Appliance If it trips intermittently then it's difficult to locate the fault without test equipment.

Exact details still to be worked out - I'm still at the design stage. Location will probably be a cupboard though - i.e. accessible for inspection and maintenance.

Yes - exactly.

I don't anticipate volt drop being an issue as it will be star wired, so won't be taking a meandering route round the building, and in normal operation the current in each leg will be a small fraction of 6A. There will of course be a run of cable from the MCB to where the circuit branches off...

I'm going to be rewiring my house and am considering using 1mm cable for the lighting circuits. Is there any particular reason why 1.5mm is used so commonly? It'll be on 6A MCBs and star-wired. I've heard that 1.5mm can be easier to work with, but I'd have thought the reverse would be true.