I am in the process of installing electric underfloor heating mat. The installation checklist has fill in boxes box for heating element resistance, probe resistance and insulation resistance both before and after installation.
However the heating mat is double insulated (has only live and neutral wires, though is screened) so how am I suppose to test the insulation resistance. I can undertstand after fitting, testing between live/neutral and earth as a check against accidental insulation damage, but before installation ?
The form looks like a generic form and I suspect is wrong, the inulsation resistance being for the mains wiring as opposed to the heating mat itself.
Any thoughts on what values I am looking for after installtion ? (n G Ohm?)