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Not like you, BAS - I think you'll find that 2 1/2 years on he's had it replaced by now :)

Why does he need to know if it's a ring - can he not add a socket to a radial? :)

Not gonna happen - unless you find a dodgy electrician.........and if you'gonna do that, you might as well just do it all yourself anyway.

Bernard, if you are going to make these statements as if they were fact (which I dispute), then please try to get the actual figures right. The RCD will trip in less than 0.04 sec at 5I (150mA) - not 30mA as you are implying. So, you class 1533 ohms as 'low impedance'? This is only...

Firstly, a 30mA RCD will operate in under 0.04 Seconds, not 0.4 Seconds. Secondly, if there were a potential on bathroom taps / radiator, this will have arisen from an earth fault within the installation, which would cause an imbalance between line and neutral and trip the rellevant RCD - it...

I wonder if that's where the term 'earthed equipotential bonding comes from. :) I don't know why you always seem to find a problem understanding earthing/bonding. In the scenario that you describe with just lighting in the bathroom, the taps, due to main bonding, could rise in potential...

Yes, and given the small cost of that bond, you might as well bond your metal loo roll holder - along with your metal toothbrush holder...........oh, and don't forget your door handle. Why don't we give advice according to the regulations - instead of making it up as we go along........that...

You know what, John, I haven't even read your post before typing this reply :oops: :oops: I've just been down for a coffee and on my way back upstairs it suddenly dawned on me what a ridiculous statement I'd made ha ha. It's 32+ Amps for each cable - but obviously, he can't pull that -...

I was just going overboard, John. He said he needs 30 double sockets - 60 outlets - 21 of which will be computers........39 for god knows what. Because he used the word 'overload', I've given him 32A per radial - 192A total - he's not overloading that. :D As for saving of cable......you...

Fit 3 x 32A, 30mA RCBOs and run two 4mm radials off each RCBO. Each radial will feed 5 socket outlets - giving 30 outlets in total. Spreading the computers over these six radials - giving 3 or 4 computers per radial - should minimise any leakage problem.

I bet he's back on here tomorrow - the electrician's bound to be on holiday. :)

You don't trust the electrician - so you thought you'ld double check on a DIY forum?? Ha Ha :lol:

Someone will appear shortly and ask - 'What does your electrician say??' :) But instead, I'll ask the other relevant questions: What is the installation earthing system? What size is the SWA that runs to the garage? Are there any extraneous conductive parts in the garage? What...

I don't see why.......it's pretty straight forward. :) The bath will never require 'earthing' - it is not part of the electrical installation. It may require 'supplemetary bonding' - but only an electrician will be able to tell you this.......after he's assessed your supply...

Yes, perhaps I should have used the same answers as for the earlier questions - i.e. with consideration of loading. What you suggest would be fine - just as it is in Point 7 (All run from MCB) "I don't think I've seen anything in the regs which explictly prohibit more than one spur being...

Sorry, I should also give my answers to the OPs question, instead of just butting in. :) 1/ A ring final 2.5/1.5 T & E with six twin sockets on a 32A B MCB? Compliant - Yes........subject to consideration of equal loading of 'Ring' Safe - Yes........subject to consideration of equal...

Agreed.....there is no way that an un-fused 2.5mm spur off a 2.5mm ring final is restricted in length to 3 metres........which is essentially what is being suggested.

Quite, but I, as an electrician, am oposed to some scaremongering H&S do-gooder, who has probably never tested anything in his life, telling us we don't have to test it, we can make the figures up. I would rather test it. You see, the one big flaw in adding R1 + R2 to a Ze figure gained by...

I was referring to an alternative method of testing Zs of a final circuit - at the CU as opposed to testing at the furtherest point - saves balancing on top of a ladder and trying to fix three leads to your ceiling rose to test non-trip............but you won't find the method described in GN3 :)

Yes, but GN3 is just that - guidance on how to achieve the correct test results required by the regulations.......you can use other methods. For instance - testing Zs. GN3 gives you a method of testing Zs, but that's not the only method........you can test Zs at the consumer unit - and it...