Recent content by fisherprice

According to 17th ed. electrical separation is specifically not permitted for ufh (753.413), and by my understanding of 753.411, an earthed covering is now required irrespecitve of location if the heating unit has no exposed conductive parts. So it seems there really are no alternatives other...

I must have been half asleep. I was envisaging the rcd picking up an imbalance between line and neutral in the event of, say, insulation failure on one or other. But of course the whole point of being electrically separate is that a leak under fault conditions would not be trying to find it's...

If this were to solve the problem, where would that leave us with regard to the RCD protection stipulated by the regs? Presumably placing the RCD on the load side of the isolating transformer would be in compliance?

I am still very keen to try this experiment for measuring the induced voltage. Any recommendations on the best/most cost effective means of placing a reliable, easily adjustable resistance across the meter? Any comments on my thoughts about the grout being the path to earth?

Thanks for clarifying that TTC. It's good to have another avenue to explore before resorting to lifting the tiles. Would like to take this opportunity to thank everyone again for their input, it is greatly appreciated.

Thanks for this suggestion. I'd be grateful of you could confirm the theory to my uneducated mind. What might you expect to happen in terms of the physics?

Thank you for the feedback gents. So that I am absolutely clear in my mind, I should take the earth reference point as either the MET, some bonded pipework nearby, or a socket screw etc? And in terms of an adjustable resistive load across the two points, what is the most practical method...

good point, well made. what about the apparent earth path via the class II? Or am I being dumb and is it that a greater pd is being induced in the tv/audio equipment, and by touching it he is becoming the path to earth? Come to think of it, he mentioned the stereo amp to be 'buzzing'...

Thanks for that TTC, but to complicate things- when he got a shock from touching another person, that person was standing on the same tiled surface (with the ufh below), albeit possibly with shoes on. Furthermore, he gets shocks from touching class II equipment such as TV which is also on the...

just to clarify, I didn't install the ufh. I didn't even know the bloke 3 years ago. Come to think of it I don't actually like him that much anyway :wink:

Matthew, according to my friend, the heating works fine, no cut outs or reduced power. Having said that, the problem has persisted since installation so I guess he has no point of reference to compare. Am I correct in thinking it must surely be EM induction, on the basis that slate was at one...

Thanks gents. So if my understanding of TTC's account is correct, this isn't really a fault as such; rather that these type of systems require the earth covering in order to prevent what is an unwanted but otherwise consequential side-effect of this type of system. If this is indeed the case...

Short of lifting the tiles (obviously he's not keen to take this option until all others have been exhausted), how would one establish and locate a potential neutral fault? BTW I contacted the manufacturer's support line operator who, after jumping to the conclusion it must be an earth fault...

sorry to highjack this thread but looking for assistance and this is the closest related issue I can find. My friend has ribbon style UFH installed under slate tiles. RCD protected, and RCD is working fine. UFH cables all giving resistance readings within manufacturers range. Earth mesh was...