The resistance of each individual heating cable should be measured and documented with a multimeter before installation. For a short-term function test, the individual heating cables can be connected directly to the 230V mains. As soon as the cables heat up, however, they should be disconnected from the mains again. Permanent operation without thermostats is not permitted and can lead to damage.
After each heating cable has been measured and tested individually, they can be laid out and wired. It should be noted that the heating cables may only be connected in parallel and not in series. Afterwards, the total resistance across all heating cables should be measured again with the multimeter. A final function test by applying the mains voltage again is advisable.
After all steps have been carried out, grout or tile adhesive can be applied.