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Sizing the cable and knowing how deep to bury it are technical bits, so obviously you will now get an electrician.

Is the T+E constantly being disturbed? How often is the boiler front panel opened? That being said, flex is the appropriate cable type. Not sure of the particular reg, but for sure there will be something general about using appropriate materials and methods.

OK, maybe more than an hour, but it's 8 back boxes probably surface mounted to a garage wall and four fluorescent fittings, not a huge job.

Why not just mark on the wall where you want sockets, same on the ceiling for lights, and get an electrician to supply and fix the lot? I don't see the gain from fitting a few sockets yourself, it's an hour's work.

Just stuck in a bit of choc block to keep them from flapping about and touching something else I would guess. If indeed they are connected to neutral.

Presumably when you build this annexe you will be getting building regs approval so will require RCD protection on new circuits. If it is a fuse board, now's the time to swap it out.

What's the point of that? Clearly, the OP means a socket outlet. OP, wagos or choc bloc will be fine.

Bit of a different scenario, but quite common for industrial power supplies to be fed from C curve MCB's, as per manufacturer spec.

Your work should be compliant with Wiring Regs. That means designing, installing and testing.. Whether you choose to DIY, to notify the LABC or whatever is a different issue.

You probably have 2.5kW hanging off what is a 50m extension lead, 2.5mm flex will be fine for both volt drop and current. Temporarily, electrically it's OK, assuming the kitchen socket is RCD protected. Permanently, it's a lash up, as I'm sure you know. As for costs, the cost of the SWA is...

Are you an electrician?

Although it might look and feel a bit ratty, there's probably not a great deal wrong with it, if anything at all. If the cable and protective device are adequately sized, no problems there. I would want to take a look at how the two cables are terminated in the existing hob, one's fairly...

You know why, he or she will be on holiday. Skiing probably.....

Engineers are those who meet the requirements of the Engineering Council, as incorporated or chartered Engineers.

You know this is a forum, right? And how they work? A place for discussion, comments, offering a bit of advice. Exactly what BAS did.

Done a bit of reading up on it myself on the back of this thread. Seems that certainly some showers modulate the heating element power by means of triac switching, in order to control temperature. Redring Selectronic is one. None of which means that the design current is reduced, because it may...

Sizing the MCB to suit the load is always better, such that Ib <= In and is in fact compliant with the regs. Unlike your method.

https://cpc.farnell.com/danlers/tlswms1246/time-lag-switch-6hr/dp/LA06927?st=time%20lag%20switches You will need a neutral at the switch though.

Wieland do a system called Podis, which is a profiled, flat cable system with insulation displacement connectors, carrying 3P N E and 24vdc in one cable. There's a gazillion miles of at Gatwick, used on baggage handling systems, works well, once installed. Flatform profiled cables always require...

This drive can supply all the current this motor needs to start and run. Your point about the motor windings is valid though. If it's an old motor, the winding insulation may not be strong enough for vfd operation.