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AC does not have a polarity as such, so as long as the power supply and the contacts are not connected it would work either way around.

The line and neutral seem the wrong way around, need to check which is why just red rings, the other two easy enough, not sure with Hive, this means earth not required, but normally have a terminal to park the earth wire into.

Yes, that would need to change. And there are questions as to where the CT coil will go, whole house or garage supply, also if being charged inside the garage, then no need for loss of PEN as being charged within the equipotential zone. But my next door neighbour tests and reviews cars, he...

A complex question, to charge an EV is not a problem, to charge an EV within the time one can get off-peak supply is something else. Much is down to why you want to charge, next door to me, it is down to being handy to charge at home rather than take it to a charging station. My son however is...

The normal is the landing light. Marked borrowed wire, what happens instead of using three wires between the switches, only two are used, and the line is borrowed from an adjacent switch. As long as the adjacent switch is supplied from the same overcurrent device, the only problem is it can stop...

Oh dear, think he needs to return to school.

This is from the appendix, not the main body of the regulations, and it is all about the problem taking a heavy load near the origin. If a heavy load is taken from the centre of a ring final the load will go down both legs reasonably equal. But 2.5 mm² cable use with a ring final needs to be...

I remember using the C crimp so the earth cable was not cut, but only with flameproof installations. The point is Octopus is doing the installation in such a way as they don't disturb the original installation. What is the point of doing that, if they want to lay down rules on how the original...

Until I enlarged it is hard to see the brown to the light. The 4 gang switch plate is the master for the two-way lighting with two wires in both L1 and L2, the back box is being used as a junction box, so brown blue to light, and brown black grey to the intermediate.

Clearly lost permeant line, I have found where the wire was not in a terminal, but just resting there, I would in the ceiling roses, just give the line wire a little tug, to make sure actually in the terminals of the ceiling rose.

Correct, I have marked SL for switched line and PL for permanent line. Since grey and black go to the intermediate then brown in com should go to a block connector in the intermediate switch, and the com on the three gang switch. Brown in L1 to light, and brown in L2 is clearly linked to the...

The Ceiling rose is similar, Earths have been left out for clarity.

You have a permeant line, switched line, neutral and earth labelled here. So neutral to permeant line should be around 230 volts all the time, but neutral to switched line only 230 volts when switched on.

More interested line to neutral reading, clearly 142 volts line to earth is wrong, but often old installations lack an earth. There may be an earth wire, but often not connected. The fluorescent lamp may be end of life, you can get LED replacement tubes. With tungsten lamps a poor connection...

The problem is we have multi parties deciding what it required. So a conservative government can have a labour sub government ruling what happens in Wales. Add to that Ulster and Scotland and you have a system where there is a free for all, with even one law Part P having multiple requirements...

Nor had I thanks!

The chart I show is every 30 minutes. I am sure, there is enough data to say if using x kWh of gas or oil per year, it needs a heat pump of y kWh output. What it with meters pointed at a wall or window. 95% of the time, you can look at the bill for the previous year. OK, some people cook with...

If I came to fit a shower, and the loop impedance is not within spec, I have two options, find out why and correct it, or say sorry can't fit the new shower. Are they saying they are using incompetent engineers? It's a bathroom, needs to be a scheme member to work in a bathroom in Wales, are...

I already have the twin battery charger, it was the idea of having a unit which needs two batteries at a time, with a single battery charger, the twin one is fast, so with two sets of batteries, by the time second set are flat need to wait about 10 minutes for the first set to finish charging...

Yes, OK, stop losses first, or at the same time, but if the heat pump does not work with poorly insulated homes, neither will it work with well insulated homes. Yes, I see we have a 60 amp fuse in the supply to many homes, so 40 amps for the house we have 20 amps for the heat pump, so 4.6 kW...