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Be carefull when deciding which method to use. Some of these "standard" methods depend on an internet connection to a remote hub which is at first is a free service but after a while connection to the hub becomes subject to a subscription fee.

A device could use separate current transformers ( one on Live and one on Neutral ) and a voltage comparator to determine the difference if any between the Live and Neutral currents. Most MCBs use a single current transformer with Live and Neutral in antiphase through the core The device...

I would say they might exist but if they do then they would have to have some very complex electronics to evaluate in which direction the unbalanced power was flowing.

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I got it wrong, didn't see the terminal top left was a dummy.

A cabinet maker would know where to obtain good quality hardwoods.

From that photo I would say there is a health and and safety issue with that dumper truck on that earth bank if the bank collapses.. ""Contact us if your query is about: a safety threat to you or others https://www.networkrail.co.uk/communities/contact-us/

Has there been any progress with this ?

coloured tie wraps one of many sources is https://cableties.co.uk/search?q=coloured+cable+ties&_pos=2&_psq=colour&_ss=e&_v=1.0

What will the battery voltage be at the end of those 20 days ? At what time in those 20 days will the equipment supplied by the battery cease to operate due to low voltage ? How many amp hours will have been used when the equipment ceases to operate due to low battery voltage.

1.0mm cable can be 70 metres when load is 500 Watts ( 2.2 Amps )

Meauring insulation with a DC voltage will only show leakage due to resistive paths from Live to Earth, It will not take into account any capacitive paths from Live to Earth EDIT just noticed that Eric has already mentioned this

Speak to the contractors about this. They will probably need to have access to all the area in the loft. Fixed panels will prevent them from getting that access.

Steinel make very good PIR sensors, they are not the cheapest but in the long term they are good value. I fitted a IS 180-2 at a friends house about 25 years ago and it is still working perfectly.

If the sensor and the light are separate items then the sensor can be located where it is not triggered by passing traffic and the lamp can be located where the light is needed.

Is there a film ( anti glare or solar ) applied to the glass ? They are invisible until scratched or "bubbled" by heat or use of the wrong cleanig fluid

The diagrams in http://www.klar-environment.com/pdf/PD0094-24BA-BB_Installation_Guidelines.pdf show the capacitor as a RUN capacitor. It's function is to create a phase shifted supply to the Z terminal of the motor. This phase shift ensures the motor rotates in the right direction. A START...

The cut out might be damaged ( or just old ) and fall apart when the fuse is pull out. Could leave a lump of naked metal ( half the fuse holder ) Live at 230 Volts and exposed. If that lump of metal touches Earth or Neutral then the arc created will be fed from a slow blow fuse in the...

The problems with evicting them and then blocking up the entry points are :- 1) They can re-enter through very small holes, 10mm is no problem for them 2) They will cluster close to the roof and be a clear indication that they used to live there,