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It would be very interesting for other forum members on here, if you could confirm that you have checked the Zs readings for the circuit are still within the characteristics for a C type breaker?  By my rough calculations swapping a 6amp 'B' to a 6amp 'C' reduces the max permissible circuit...

Why 4-core to work a light?  Doc H.

If the tank is below the minimum temperature setting of the thermostat it will never "click to the open position".  As it thinks the water is too cold and needs to be heated up. It will only click open once the tank is up to temperature. Fault finding any switched item, be it a...

Have you tried; https://www.metrel.co.uk/uk/content/support-uk/technical-support-uk.html  ? Doc H.

For some unknown reason the OP PM'd a reply to this thread directly to me?  Copy below; Doc H.

No earth, No Supply, No meter, No understanding about how to read Zs, No cable?  We need more info about what it is you are trying to do, real job or training course question.  Doc H.

Already mentioned here: Doc H.

Anyone else received an e-mail about the amendment train arriving at platform 1.  https://electrical.theiet.org/media/2332/amendment1_read-only_final.pdf  Now Christmas is over do certain regulatory bodies need to top-up their Christmas-club savings reserves, or is it the summer-holiday savings...

On a similar vein to the over budget expenses for the HS2 project. What about dumb smart motorways? What will become of long distance travel by car on our main routes between major cities etc.? Or is it a clever deception to try and get more people off the road and onto the train? Doc H. 

If that drawing is how your current system is actually wired then I cannot see how the current thermostat has ever worked?  Ignore the colours for the moment, if you try to follow a live path from the programmer, via thermostat to boiler, its just looping back round on itself doping nothing...

Com=Red, L1 = Yellow, L2 = Blue,  (which you say doesn't work) or  Com=Red,  L1=Blue,  L2=Yellow or  Com=Blue, L1=Red, L2=Yellow or  Com=Blue, L1=Yellow, L2=Red or  Com=Yellow, L1=Red, L2=Blue or  Com=Yellow, L1=Blue, L2=Red Are your six options to try.  If the old switch was labelled...

Does this course have a City & Guilds course number? if so you can search the C&G website for the basics of what each course involves. Have you downloaded and read Approved document P? https://www.gov.uk/government/publications/electrical-safety-approved-document-p  as that is what I...

As there are no standard colours for central heating wiring. we really need a drawing/description of how it was originally wired between programmer/thermostats etc. Doc H.

Maybe the RCD will not operate at all now you have fiddle with it? How have you verified its operating time and current? This RCD needs testing with an approved RCD tester to verify it is operating within the correct time and current characteristics defined in BS7671 wiring regulations...

The colours mean nothing without knowing where the were on the original switch. You have a 1 in 6 chance of getting it right without knowing the original wiring, or metering it out between both switches. Doc H

Hello Lewis, welcome to the forum. I will try to give a bit more meat on the bones of how & what Part P is to complement what the others have already said.  Part-P is one of a number of building regulations that has relevance when undertaking domestic electrical installations and...

Have a read of Appendix 7, and note3 at the top of page 485. Doc H.

If the circuits have been designed correctly for the expected loads, the cables should have been selected in relation to the installation methods, so should be able to carry the power you want. But I am not convinced the average domestic consumer unit is intended to run at higher than average...

Physical currency (paper or coins) rely upon specific businesses being authorised to produce and distribute notes & coins. But they can't just create and distribute currency as and when they feel like it, it has to be controlled and authorised by institutions such as the...

I would reword that a bit and say 'our duty is to ensure all work we are involved in will 'Fail-Safe'.  With all things electrical, (Installation, additions & alterations, fault finding or inspection & testing), its possible to forget the fundamental principal to protect people, property...