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Have just found it somewhere else I think: http://www.diydoctor.org.uk/tips/tipsplumbing.htm

Croydoncorgi please can you elucidate about the cure as I think I have exactly the problem you refer to. We've just had new cold tank in the loft and after using water from it we get a resonant humming/vibration on the rising main into the loft; if I turn the stop cock off it stops and then if I...

It's all installed now - have a combined flow rate of 60 l/min using Salamander RSP100 3 bar pump and Bristan Fusion bath/shower mixer tap.

The boiler is an oil fired Worcester Bosch 15/19; it will only be heating the hot water as our heating is warm air via a separate boiler. I am not sure on the coil, but we specified a high efficiency one rather than the standard. Cylinder is about as big as we can fit - it's taller than me and...

Thanks guys for your replies. I have already fitted an immersion at the bottom of the cylinder today, but actually that is not my real concern as normally the boiler will be heating it. My point is thus: Reason for having a cylinder is to store hot water so that you can use it faster than...

Advice for hot water cylinder connection with a pump We are having a complete new hot water system installed upstairs with loft tanks and a large capacity indirectly heated cylinder. Because the bath is quite large we are going to supply it with pumped hot and cold water, which will also feed...

Ok thanks. Yes, one is fixed.

I hadn't realised that pulling the main fuse was such a big deal - we used to have a static caravan when I was a kid and one of the jobs at the end of our stay was to go in to the electrics hut and pull the 100 A main fuse for our caravan - reason being they used to get nicked. It used to be my...

sorry for ignorance, but what exactly do you mean by fixed lug ? Do you mean that the box is nailed into the wall ?

All sorted now and thinks to everyone for their help. Only 1 niggle - I ran the earth from one of the new sockets that the guys installed last weekend. I noted that their earth cables go into the socket plate, but there is no connection back to the metal box. Obviously the metal screws will...

I have to agree with Breezer - both dingbat and ban-all-sheds were very helpful to me with my problems http://www.diynot.com/forums/viewtopic.php?t=14756 I now have a working RCD in my consumer unit, earthed light switch and know there is a neutral/earth fault on my immersion heater. For...

Thanks plugwash. Yes the single cables are black and then have a grey outer sheath. Are there different types of junction box or just one ? I know it's not great to steal the earth of another, but when we have the downstairs rewired I'll point it out to the electricians. Thanks for all your...

Thanks again to all for your advice. I have just one more question if I may: I worked out the situation with the non-earthed light switch and think I know where I can connect the necessary earth. I want to run a good earth from a socket and break it into the earth wire in a 2core and earth...

Your logic is wrong. The load is the same, the current is what is less. The power supplied is the same, the current on the supply side is 20 times less because the voltage is 20 time more: Power at 12V = 50 W, so current in low voltage circuit is 50/12 = 4.2 Amps In the high voltage...

We have a new consumer unit which contains an RCD protecting the sockets (long story, http://www.diynot.com/forums/viewtopic.php?t=14756). Simple question: Previously I always used plug in RCD adapters when using power tools or lawnmower, etc. Now that the sockets are already RCD protected at...

Now that you raise the question, you've answered a niggle I had. The circuit in question has a double pole switch with red light downstairs, upstairs is a normal 13A socket with a plug in timer and then a normal 13A plug connected to the immersion heater. I disconnected the neutral and live at...

If the cable from the CU to cooker switch is 10mm2 then it will have a fairly large fuse/MCB associated with it that will allow a large current to flow. If you run a 6mm2 cable from that, then that cable can be supplied with current up to the level of the 10mm2 cable's fuse - that means the 6mm2...

sorry for lame post just then - I was trying to include a quote from ban-all-sheds "is the rest of your wiring like this", but didn't know how to do it and pressed the wrong button by mistake ! Anyway, unfortunately yes the downstairs wiring is fairly typical like this with bare earths. I...

[ban all sheds wrote]reeeee[/ban all sheds wrote]

Thanks to all for your advice. If you're interested, here is what I did in longwinded format; if not, the summary is that it is mostly fixed with one remaining doubt. After reading a few faqs about wiring and CU's I felt confident enough to have a go. I turned off the double red switch and...