Electrical Questions? Ask an Electrician Online.
Welcome to www.justanswer.com
Assuming that a ground wire is included in the circuit, disconnect all three conductors on both ends then connect L1 to the ground wire at the load end. Using a multimeter set to read continuity/ohms, get a reading between the ground wire & L1. Disconnect L1 from ground, connect L2 to ground and get a reading. Both reading some should be approximately the same (within the tolerance of the meter? , if one is much higher than the other or open, that conductor is defective and the wire would have to be pulled out and replaced with a good wire.
How long is this run? What voltage is the mat rated for? What is the wattage rating of the mat? Thanks Ken
Any progress, any questions? Thanks