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You must work for the council then. Why don't you use 6242Y 1.0mm ?? I have asked many sparks over the years, why do you use 1.5mm and the answer is "because we do" 1.0mm 6242Y/6243Y meets all requirements of BS7671.

Are you 100% sure it goes off at 5pm every time it trips. Could be accumulative leakage throughout the property. Do you have any surge protected 4 way adaptors.

Sounds like the old fan was a Humidistat fan, and if the bathroom has a window then there is no need for it to work with the light. Isolation switch better outside bathroom though.

It's a new fusboard, is it an M2 Fusboard sold by CEF. They have problems with some Rcd's, many have been returned.

Don't forget he also has up to 28 days to submit.

Hmmmm, MEB, they once asked why 25mm Tails had not been used on a Wylex 106, 45A, 1 Way Switch Fuse ??? Try they don't fit.

Well 10 years ago our area Electrical authority gave all NICEIC Approved Contractors seals to re-seal the meter or cut-out fuse. They acknowledged that responsible contractors could and would use the seals if provided. This saved them the problem of seals being broken and left and having to...

Only he will know that, if he is unsure then he should leave it to the pro's

Without the Neutral shunt, the contacts will take for ever to make and break on the stat. You need the shunt to make the stat function correctly.

Neutral on 2 from stat needs connecting to the neutral terminal in boiler, to operate the shunt in the stat, if not it will take hours to operate.

The live on the T40 is in terminal 1, the neutral to terminal 2 and the switched live to terminal 3.

If sitting on the insulation NO, only when surrounded.

Isolate Live, Neutral and earth within fuseboard of each circuit, one circuit at a time until you can be sure which circuit is responsible. This will narrow it down.

Who waits for DNO to pull fuse ???? Break seal, remove fuse (health & safety), do work re-seal or notify board to re-seal.

See http://www.harrian.com/Prod_info/info/alpha/cb24_28.pdf

Remember to remove the link between 1 & 2 on Combi connections, before connecting thermostat.

Boiler Connections. 2 = Live Out to Common on Thermostat (use red) 1 = Switched Live return from Thermostat (use yellow0 Neutral (use blue) connect to Neutral connection on combi. Make sure your red goes to the common in the stat, with the yellow to the switched live return and the neutral...

JohnD is correct, most builders will put in the insulation up from under before tacking the ceiling, therefore cables are above the insulation, no need to de-rate. When it's a refurb and the ceiling is existing but the floor above is up, I get the builder to tuck the insulation under the...

Gary interesting find that, I once contacted Megger as I was concerned how high my Zs reading was on a 30mA using the No Trip Test mode, when I first purchased the machine. The tech guy said that any reading to 999 ohms would satisfy the requirements for the use of a 30mA Rcd. I did mention it...

From memory if a Rcd is used the reading can be up to 999 ohms.