Underfloor Heating Wire Construction – Cable return
At the far end of twin conductor heating wires there is a cable return or fly end. This is the termination of the heating wire where a special join is made to allow the heating cable to operate with just one end connected to the thermostat.
This connection is normally encased in a special epoxy or glue to ensure it is electrically protected to the required IPX7 rating that is necessary for electrical underfloor heating for use beneath tiles or levelling compound. The connection must never be bent or crushed and on undertile systems it must always be covered with tile adhesive, levelling compound or screed.