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Aha, I think know this one. I asked about diversity just a little earlier, it basically means that since you aren't going to be turning on all the hobs and oven to max, it won't actually draw the maximum current. There's some formula or other to apply depending on what type of circuit it is...

Thank you. I have a rather limited knowledge of electrical equipment, and regularly get the terminology/function wrong, sorry for the confusion. I was originally under the impression that an isolator rated to a certain current operated as an MCB as well.

I have consulted google on your behalf and located a 45A Hager RCBO. http://www.gil-lec.co.uk/products/Circuit+Protection/Industrial+3+Phase/Hager/RCBOs/Hager+RCBO+Type+B+SP+45A+30mA+10kA/3354614079

I don't know if the planned isolator provides overcurrent protection or not, it's just labelled 100A double pole isolator on the diagram. My intended question would perhaps have been more clearly put as why a switch fuse for overcurrent protection instead of a cheaper, smaller modern circuit...

Why don't you return the wrong MCB and get the right MCB?

The first chap knocked a hundred off his price, and has provided by far the best written quote with clear diagrams and a schedule so I'm going with him. Take note sparkies, customers like cogent written quotes and sometimes even accept slightly higher charges if it seems the man knows his...

I recently had the same questions, sort of, I believe you'll find all you need to know here: http://www.diynot.com/forums/viewtopic.php?t=264072 Your options are to run it from the CU or preferably run it as a sub main, you can't run it off a kitchen socket and you can't run it without...

You have listed things that were proposed without evidence and overcome by scientists using the scientific method. You seek to suggest what would basically be a role reversal now, where the contrarians without evidence are correct and those who rely on the scientific method are the opposition...

The global warming debate between left wing environmental hippies and daily mail readers it not the same as the global warming debate between scientists. The physical properties of carbon dioxide really are not in doubt. Scientists do not have their funding cut or get ostracised for producing...

I'm afraid I have very little sympathy for the builder here. He was alerted to the customer's concerns over his method and overrode them, ruined the job wasting expensive materials, and performed illegal and dangerous work on the electrical system. And since he thinks he deserves payment...

Perhaps I'm being a little wordy there, so just to be clear - in between my fancy long-winded letters citing statutory rights etc, I would tell the man in plain english that he was getting nothing for wrecking my job and if he gave any trouble at all or contacted any member of my family again I...

1John's approach is perfectly reasonable and probably the path of least resistance. Personally I'd take a harder line and refuse to pay him anything, pointing out the substandard tiling and illegal elecrical work, and the cost to you of rectifying, but then I'm retired and like a good dispute...

So you design circuits to run at x percent of maximum, on the understanding that if it were 100% the circuit would have tripped, but it almost certainly never will be? That makes sense, thank you. Is x a fixed value or a case by case thing? Rule of thumb or detailed calculation?

I often see 'diversity' come up on here, what does it mean exactly in the electrical context?

Thank you, that is very useful information. I will request a brand that is still solvent, after all if it goes wrong I shall need to... contactum.

Looks like he has already to me, except that no flagging in S/L bit, which running through my layman's translator comes out as 'the switch lines aren't marked as such', though that's something of a guess. The rest seems clear. Whether it's accurate is another matter, possibly one of them is...

Are you sure of your leak location? With bad flashings or other tears water may be running under the felt for quite some way before finding a way through. There are various repair kits and methods for holes and tears, I wouldn't rely on paint. Have a read of this...

The assessment of the client is that it would be bloody annoying :lol: Is contactum a good brand?

I don't think that is correct, because the OP's statutory rights have been broken which grants him the right to terminate any contract and withhold payment: More info here: http://whatconsumer.co.uk/dealing-with-dodgy-tradesmen-or-builders/ The builder would of course have the right to...

Two more quotes, one chap for 650 and one young man, who candidly told me he's just qualified, for five and a bit. I'll see if contestant number one will drop his quote a bit based on contestant number two. While I wish contestant number three all the best, I'll go with a little more experience.