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Because the supplied connection is a power supply with an integrated UK plug then the easiest solution would be to install, safely and in accordance with the wiring regulations, a light switch to supply and control a 30mA RCD protected socket outlet labelled to indicate the use only for the...

You have got to the end of the amount that is possible to assess without exposing yourself to risk. If every item of current using equipment was disconnected from the ground floor ring when you were testing then it would indicate that the fault is in the circuit and not in any appliance but it...

I think ProDave  has probably covered it, you need to check the test results of the electricians who installed it (I am sure you have some available!) and see where they have been made up rather than measured. As an initial check on your installation for the lighting, without the power on check...

The arrows are just to say from this MCB to that MCB.  The white text box is meant to spread over the range of circuits covered.  The black bar is intended to indicate where the RCD protection stops. So there are six circuits protected by the RCD the four to the right and the two to the left...

Welcome along. I hope you find the forum useful. Your easiest solution would be to buy a multifunction timer relay that can operate the coil on 24VDC and has contacts rated above (possibly significantly above for starting a pump) 5A. You would want to set the trigger pulse to be long enough to...

Your consumer unit has been extensively and inappropriately modified, presumably at a time when new electrical work was being done. I attach a diagram to show that a fault on certain circuits only may be causing the RCD to trip. As identified above you can use trial and error over time to try...

The instructions say it should have a motor starter, presumably only for the overload as it is switched on by the unit switch. They also state the mounting plate should be mounted on a solid concrete base 200mm below the level of the pool edge to allow the unit to be flush with the edge...

The installation of the system would depend on the design of the swimming pool to which it is being installed. You state that an isolator has been installed but do not specify if they have also installed the appropriate protective/control devices (30mA RCD, B16 MCB, motor starter). If all the...

Variable success rate apparently with wish, some good, some bad, so long as you are not going to overspend and can manage with the bad as well as the good, probably worth a go. It is never worth the postage back to China, but China postal service to here is very cheap for the supplier. I would...

Beautiful design!

BSI code of practice of FD&FA part 1 cites clauses 23.2 of BS5389-1:2013 (superseded by 2017) 23.2.1 The following recommendations are applicable to the siting of CIE. a) Indicating equipment, in conjunction with suitable manual control facilities, should be sited at an appropriate...

Knightsbridge: the mark of quality (is missing)! I would suggest that the cable being buried in concrete will protect it effectively from mechanical damage as there is no ground to disturb (if you just label the concrete as "Caution, cable conduit do not move or damage" :) ) Using plastic...

I had a customer with one that kept blowing fuses but before I could convince them I should look at it they changed it for a modern boiler. The only things I found when looking were a couple of pictures.

100mm deep? that is quality work for a hose pipe run, normally about 10mm deep for maximum damage potential. :) 450mm deep SWA bedded in sand and with warning tape a spades depth deep above it sounds a good plan. 600mm is normally only necessary where the land above is being dug up regularly.

We cannot tell you about the wizardry, because I am sure I heard somewhere that you are not a magician but an electrician. :coat

It sounds as if you have got the results working correctly. If you are testing and want the reading to update automatically without pressing test you have to pres the handsfree button beforehand so that handsfree is shown on the display (and press again once you have finished testing to stop...

That is useful to see, the deformation of the core gives you hope for security of contact. As you say the insulated ones are weaker, but if the crimp force is similar it should also deform the core (but would it stay)? I crimp solid cores anyway, they seem OK in most cases.  I just do not do...

Welcome, I would probably expect 2.5mm² five core SWA should be sufficient if you have a 20A breaker, but depending on length of run before the existing board and tripping characteristic you may need to upsize to account for volt drop and cable resistance to meet Zs. If the rating is at 240V...

Listed on page 8 of BS7671 amendment three (yellow cover), shows the colours of the covers over time.

If you have loop in wiring as per Tony's diagram then when you are testing for polarity and the readings are coming out the same, test the same test but put one probe on the permanent line (the other on earth) and see if that remains at 999 no matter where the switch is. If so then you have...