My builder installed underfloor heating several months ago but did not connect to electric supply. It looks pretty simple so I decided to do it myself.
Prior to connecting, I tested the heating mat which gave me a reading of approx. 30 ohms. (approx. 20 square meters).
I have a fused spur connected to the consumer unit which is protected by a RCD. The fused spur connects to the timer/thermostat as per wiring diagram plus a connection to the underfloor temperature probe and heat mat.
The heating mat supply cable has 2 cores plus a braded outer sheath which I have used as earth. There is no connectivity between this earth and either of the two cores.
I have checked and rechecked all the connections and everything is good.
The timer/thermostat comes on when I turn the spur on and I can set the time etc. But when the heater is turned on, the RCD turns off.
Am I doing something wrong, or is there a problem with the supply? I tested the supply with the power turned off, and there are several MCB's including the one I have used that have a reading between live and earth, is this normal?
Many thanks
Yours Grommett.
Prior to connecting, I tested the heating mat which gave me a reading of approx. 30 ohms. (approx. 20 square meters).
I have a fused spur connected to the consumer unit which is protected by a RCD. The fused spur connects to the timer/thermostat as per wiring diagram plus a connection to the underfloor temperature probe and heat mat.
The heating mat supply cable has 2 cores plus a braded outer sheath which I have used as earth. There is no connectivity between this earth and either of the two cores.
I have checked and rechecked all the connections and everything is good.
The timer/thermostat comes on when I turn the spur on and I can set the time etc. But when the heater is turned on, the RCD turns off.
Am I doing something wrong, or is there a problem with the supply? I tested the supply with the power turned off, and there are several MCB's including the one I have used that have a reading between live and earth, is this normal?
Many thanks
Yours Grommett.