Does underfloor heating need an earth?

[Grant M]

Must underfloor heating always have an earth?

I was under the impression that it always needed an earth, but a builder I sometimes do work for has already put it down and there are only two wires and no earth at all.I know that normally the earth is the metal sheathing that comes with the live and neutral. He says it doesn't come with an earth nor does it need one.

Regards.

 

[markythesparky]

Think you'll find that there is something in the regs about it. It must be covered in an earthed sheath or grid or something.

 

[Darkwood]

Sy glands have a slot either side of the thread entry where the braiding fits into so you have to half it basically.
Not easy to do if you haven't separated the wires lol

yes but your only playing with an inch of braiding so shouldnt be the biggest of tasks

 

[44ALLAN]

yes but your only playing with an inch of braiding so shouldnt be the biggest of tasks

Very true but I was just explaining to him what they looked like as he hadn't seen them before.
Hardly a task separating the wires for those glands,as you say,as I normally snip all the excess off first when using them.

 

[Stroppy]

I looked 'em up now. I don't really see the advantage of them over separating and twisting into a single earth. Maybe I'm missing something.