I have a Tile-it underfloor electric heat mat to fit, Instuctions on fitting are not very clear. The cable at both ends of the mat looks a bit like a co axial areial cable, woulr I be right in assuming that the outside cable is neg and the inside cable is positive? Ihave ran a resistence test on both cables and the inside cable is higher than the outside cable. If this is correct this would mean that there is no earth is this right.
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