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Hi Can anyone confirm for certain please that 4.7 microF is the right value? That's quite a big C to have across the mains! Thanks mike

Just realised I misinterpreted some of the wiring. The earth to the water pipe at the house attaches below the stopcock; it's not a bond, it is the earth, using the water pipe. This was accepted practice when house was built in 1960. I guess the wire in the garage goes to the water pipe too, not...

Sorry Spark 123 I didn't mention tht the Pyro is buried under the lawn which I'm not intending to dig up. In view of that, and the plastic sheath as corrosion proection, that's why i can't see it as a significant risk, and why I think it would provide an adequate earth to the house if it was...

OK, yes, understood, it needs the whole installation RCD (100mA S) to cover it, not something specific, but if I can go to TN-S I don't need that. From a short term practical point of view the chance of a problem on this cable is negligible but I want to get protection on the lights quickly.

Thanks Adam, my comments below Mike ## Don't think so. The incomer is wrapped in old cloth tape from cutout down to floor and looks undisturbed. I assume it's lead sheath as it's quite stiff and steps down in size just before the cutout. That's why I'm assuming TNS is an option.

A while ago I moved into a house built in 1960. I'm not entirely happy about the wiring configuration which is quite complex. It's as follows. Fused 60A TT supply (odd that as it's underground not o/hd and the substation is 50 metres away) comes into the detached garage. Two tails go to the...

I have a gas Greenstar, system not combi, I'm delighted with it. No it's not noisy. The fan is audible but not objectionable although boiler is on kitchen wall, not in a cupboard. I have reduced max output to 80%, it was a bit noisier before. I think its control system is excellent. It is on...

I'm adding an en-suite shower. I intend to fit a pump (dual i.e. hot and cold) next to the hot tank (on the same floor level). The pipe runs to the shower will be about 13 metres from the pump. I'm not after a high flow sort of shower, just a decent traditional sort of performance using a...

Well I tried the flame test, it burns a lovely clean blue so it must be hydrogen from corrosion. Thanks for the tip. I wonder why it only collects in this one rad (which is a brand new one)? I'd better get the desludger into the system I think. Substituting for the underfloor pipes is a last...

Most of the piping is old - it's actually imperial size copper, and unfortunately set in the concrete floor - and I still have 2 old rads (one is 300mm x 3000mm and curved round a bay so I think would cost a fortune to replace) so I thought I should use X400. The old rads I took out were pretty...

Thanks ChrisR. No I haven't added inhibitor yet - I have some more changes to make to the system (extension) and I was going to use X400 desludger then X100 inhibitor afterwards. However it's all taking longer than expected - doesn't it always! - maybe I'd better put the stuff in. How long...

Thanks for your comments COG. I take your point about the air collecting at the first rad after the leak, but even if there is a leak, how on earth does air get into a pressurised system? It ought to be leaking out not in, but there is no trace of it. Through the summer it held its pressure...

I have a system new this year with a Worcester Greenstar 27HE system condensing boiler, 3 port valve (external not in boiler) and all new rads and hot water cylinder but using some pre-existing pipework. I'm having to bleed one rad (furthest away upstairs one) repeatedly. I don't understand...