Where do I connect the earth from the underfloor heating ?
3iE Energy-Monitoring Thermostat
To ensure that the underfloor heating is fully earthed, the earth wire from the heater(s) must be connected to the earth wire from the main supply.
Connect the earth using a connector or the earth connector fitted on the electrical back box.
The underfloor heating system must be protected by a 30mA RCD at all times.