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No offence taken BAS. I realised my decimal point error after posting. Even an incompetent like me wouldn't dream of putting 41,000 mtrs of cable in a house. 25,000 is my limit!! As the font of all knowledge any ideas where the 24.35 came from in the second posting?

Am I reading my tables right? Guys - I am embarrassed that I am asking this question. I am trying to get up to speed on I&T before going to take CG2391. Continuity testing on 1.5mm T/E. A reading of 1.24 MOhm according to my calculations is approx 41mtrs of cable. My mentor says it is...

Sorry Spark it's looks completely sealed

I presume you mean inginition on and engine turning? Spark123 - A hydrometer isn't much use with a sealed battery is it?

Can I check a car battery with a multimeter and if so what am I looking for to assess it's effectiveness?

Oli Where is this switch likley to be? I don't recal ever seeing one. Thanks for the new switch suggestions.

Okay let me explain as best as a non plumber can. Timer controls the ignition to the boiler AND the CH pump. To have hot water in the summer I have to keep the boiler switched on and turn the thermo down for the CH. Because it is a gravity system the upstairs rads get hot so I have to turn...

Both work from the same timer and control panel and no way to separate the flow of water or restrict one or the other

Your right Bylough. No separate hot water......... Anyone any ideas?

Thanks guys. Am I right with the assumption though that there is no power required into the white wire. It is purely a connection point?

It's winter again and it's brought home a problem we've had for the last 5 years since we moved to this house. We have a gravity fed hot water system with the hot water tank in the airibg cupboard and central heating pump below the boiler. The problem is when we get up ona cold morning...

Lectrician. I know about de-rating for mains voltage halogens just because I know. I sthere a table somewhere that gives de-rate values for MV Halogens, Selv Pelv etc? I can't find one in the OSG.

The instructions on my mains smoke detectors aren't clear. I don't normally fit these but I am fitting three smoke detectors, one on each floor of a back to back terrace. There are three wires. Brown, Blue and White. I understand the mains supply goes to brown and blue as you would expect...

Typical 2 way switching scenario really. Get to the top if the stairs and realise that you a have left the downstairs lights on or switch from the top on the way down to save searching for a light switch in the dark.

Tihis sounds like a really stupid question but I can't get my head around it today. What is the best way to wire the following? Downstairs cellar kitchen - two banks of recessed spots on a double dimmer. Upstairs - 3 gang switch with one gang not currently used. I want to connect the 3rd...

Adam Could you explain the calculation for voltage drop on the table please. e.g. 2 core 1.0mm cable voltage drop 44.0 amps/metre?

Unlikely but the switch might be. Have you checked the fuse again to make sure it didn't blow again the minute you re-inserted it? Are you absolutely certain it was the earth wire that caused the problem? 45A fuse - Is the cable the correct size? If it isn't it could have been slowly...

Yes. All items are quite low power usage. Make sure the wires are out of harms way though. i.e. no-one can trip over them or catch them with a chair etc whoch may cause damage.

What if the ceiling has insulation above it such as rockwool? Should fire hoods be used then?

Doesn't steel capping qualify for this? If it does, does this mean you don't have to earth it?