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Thanks so much for taking the time to explain. What I don't understand, 'Is does rise to above 50v'. But its at 230v - is not like you have a dial and slowly turning up the voltage. So its not about limiting the voltage its the time it takes. And to get a very quick trip , you need a very...

I don't really understand touch voltage, I'm embarrassed to say... When I ask people they usually say , stop over thinking it , the RCD will take care of it.. Im not to keen on leaving everything to an RCD, Ive found a few that don't work as expected.. I know the principle. And exposed...

Yes on a socket and see calibration tester,

I would be very pleased if it was a "d'oh'" moment, hence this post. Am I being stupid!! But I don't think I am :(

I didn't know that, really interesting. I would have thought water would always win.... eventually

Yes will try this, thank you I have opened lots of sockets and switches. All new cable. Can't get under the floor. Its a neat install, all nicely terminated, grommets in back boxes, very neat board. Good Zs readings, R2 readings, RCD readings, end to end (r1-r2-rn) all perfect, even for the...

Thats right. Wondering if that section of cables has some how been collectively damaged, passing over a hot water pipe or a sharp edge. for example, but just pure speculation. Normally splitting common connections on the the circuits, drops the fault on the other conductors, but in this case...

Yes. the RCD's have nothing to do with it really, its just the two groups of circuits.

Could I just ask for some advice , as I am doubting myself..., or my test results Dual RCD board, in an unoccupied house, (between moves) Recent rewire, probably a year old - No installation certificates. Doing insulation resistance tests. Global test, gives poor readings, so I separate all...

Thanks EFLImpudence, really appreciate your help. There is something about MPB, which constantly make me unsure.

Am I getting this wrong EFLI you say the pipe in the second location should be MPB to the local earth bar (CU in second building)? But this pipe is already a protective bond between the two locations. Basically this pipe could be seen as a green and yellow conductor between the two buildings...

Thank you for your help, really good to clarify these things.

A metal water pipe enters the building , Its a Extraneous Conductive part (ECP) so needs Main protective bonding to the MET. That same pipe, has a branch off it which then goes back under the floor (buried) and re appears in another room in the same house. (1) Does the second appearance of the...

The V-Pro Dimmer is programmable, and you can adjust how low or high the lamps dim. Ahh. single plate ...

Thanks very much for you help with this.

Thanks for all the replies Just to clear up one point This is the programmable wireless thermostat https://www.vpsunderfloorheating.co.uk/product/heatmiser-neo-air/?ppc_keyword=&gclid=CjwKCAjwo9rtBRAdEiwA_WXcFrHdwgs4Yzf5DnHW3khdlhQiMrZQm1nkBmJvI4XdJGHIPJ5_d13drxoCuY8QAvD_BwE This stat was...

Thanks for the replies Im still a bit unsure Iva attached a drawing i've made. So I take the perm live from the wiring centre Take it to L and COM1 on the progrmmer/stat This is the bit I'm unsure, the LS for the boiler. I also link the LS from the perm live On the diagram for heatmiser they...