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3X4 is 3 cores, none designated as an earth, 4mm conductors. 3G4 would be 3 cores, 1 designated as earth, 4mm conductors.

Don't use two seperate relays to switch the line and neutral, that is asking for a disaster if/when the line relay fails.  Don't connect this in parallel with the 20A DP isolator, connect it after it with an additional, cleraly identified override switch if required. Anyone working on the...

To get a sensible size supply over that distance your best bet will be 3 or even 4 cables in parallel. Running single cable of the size required is just not practical. 

With the addition of a small adaptable box you can suitably terminate an SWA into a KMF type switchfuse unit. 

Bury a bare copper tape in the trench for an earth electrode and you should get a nice low Ra.  Off the top of my head I'd say 50mm sounds a bit on the small side. You'll want something like a 200A switch fuse (with 100A fuse) with cable box at the supply end and either a similar size isolator...

Manufacturers don't have to produce multiple permutations, if they limit their range then people will be fixed to buying a limited range. I've already mentioned the fittings I use, they don't have a non IP rated version and as far as I know don't have a non dimmable version.  If we are to have...

Yes electric firing systems generally include a key switch to isolate the firing system and testing is carried out with this switched off. The incidents I mentioned were down to operator error quite a few years ago when most of our shows were still hand fired, everyone is far more experienced...

Premature firework release is very annoying, dangerous and a bit professionally embarassing, we've only had it happen to us a couple of times. The worst resulted in about half of the display going off in the middle of the afternoon whilst testing was being carried out. (my 'other job' is a...

I wouldnt like to comment on what they are buying or where they are buying it.  My personal experience is that the fittings I use have a very low failure rate, this goes hand in hand with a higher than average price tag. This obviously partly comes down to what a customer is happy to pay.  The...

I almost always fit integrated fittings instead of led lamps, and haven't had the same experience as you. I always fit what I consider to be good quality fittings and I've had very few failures over the years which I've had to replace. 

They clearly are incapable of this if they can't manage to remember that they have started cooking their dinner. 

how is them identifying that the oven is on when it appears to be off any different to remembering that they have something in the oven cooking? I maintain that anyone too stupid to be able to switch an oven off after use, or remember that their dinner is in there cooking, needs sectioning for...

It's a great idea, but unless it actually operates the oven and hob controls then it won't achieve much.  If the oven is left on so that it is isolated via this timer arrangement then the oven controls will remain in the on position, and so the oven will come on when someone resets the timer to...

If you're going to mount a PIR directly next to the flou (assuming that's what the box is for) then why not just fit a flou with integral motion detector? to be brutally honest the whole job appears to have quite a strong odour of 5ww about it. 

Nothing unusual there then ;)  

Do you think he'd like to spend some money on a ridiculously large firework display?  I know just the people for the job ;)

If it was that simple then everyone would be doing it themselves and there would be no market for specialist fault locating companies. the first thing I notice is that you seem to be assuming that there will be only one fault in a cable, and that that one fault will adhere to to a specific...

TV work? No thanks! Been there, done that, never a-ducking-gain! 

Unfortunately the British standard in question is prohibitively expensive for the majority of us to be able to justify buying it. So as a result a lot of us end up using third hand information gained from freely available information online rather than referring to the actual standard (those of...

Then you won't need standard plate switches if you're installing automation from new, you'll need the appropriate plates to the system you are having installed. i'd strongly recommend using an electrician instead of a domestic installer, assuming you don't want the house to burn down