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What will you be running with this motor? At low speeds you will not get a lot of torque which may cause you problems.

A sad loss, very knowledgeable bloke and willing gave it out. RIP Tony and condolences to family and friends. 

Cisco do like their equipment tied back to the MET. Many manufacturers use the equipment chassis as the 0 volt reference and also the bond stop the build up of static electricity which can corrupt data.

I'll have to dig it out but the requirement for the 0.35 ohm limit is for new supplies, IIRC existing can go up to 0.8 before they'll do anything about it. This is buried in an ENA document somewhere...

My advice would be to run a separate submain to the summer house, any faults on the summer house will take out the main property sockets if there's a fault. As you have mentioned a hot tub then this needs to be designed properly, you need to know the size of the tub you want to install. As for...

Not verified. As long as your test results are fine you can only do so much.

Any chance you could post a picture of the instructions? This is a potentially dangerous method of installation, I'm guessing this is not manufactured in the UK?

For a bandsaw I would probably look at getting a single phase motor, this would be around the same cost as a VFD and less messing around, you don't need reversing or fine speed control on that piece of equipment. You could hen sell on the three phase motor to make some money back.

Putting the separate buildings on their own phases would not solve the problem IMHO. I would be looking at 3 phase for each installation and trying to balance as best as possible.

Load and voltage are directly related. The higher the current on the cable the greater the resistance and voltage drops accordingly.

So not a supply issue as such more a demand issue. You say you have a new three phase supply being installed in the future, this should solve the problem. In the mean time I would consider reducing usage where possible such as not using under floor heating and not having large loads on at the...

I take it the manual is in Chinglish? Do you have the manufacturers details? Possibly supply live into L, outgoing live into S and both neutrals in N. But I can't be 100%.

If you post your rough location one of us might be able to assist or know someone who can.

All SPDs require over-current protection. Read the manufacturers information as some count the DNOs fuse as sufficient if it is <=100 amps for example. If the SPD is part of the enclosure then you may not even need to list it on the circuit details page, just ensure the SPD box is ticked on...

I'm thinking this is a current inrush on start up doing this. Ideally the AC unit needs to be on its own dedicated circuit. Just chucking 40 amps in will not do anything apart from make your circuit unsafe. Do you have the specification for the AC unit? I'm guessing it might require a C curve.

IIRC the discharge time is now set by the designer from the fire risk assessment, the lighting should remain effective for the duration of the escape time. Good luck in getting that information... 🤣 Before any testing I would be checking the dates on the batteries, if over five years or close I...

If you have transferred your qualifications across and have proven experience this won't be an issue. Get to know BS7671 well and how we work in the UK. Also safe isolation procedures, customer complaints and all the other gumpf that goes with it.

The the source is a TN system and the outbuilding will be TT?

I just enter 'not verified' with a full explanation in the additional comments box.

The RCBOs need to be suitable for use on a TT system, check manufacturers instructions. If the tails are suitably supported, either clamped or glanded, then there's no requirement for an upfront RC, just a double pole switch.