However, a good rule of thumb is to embed at least 12 in.
#Electric radiant floor heating 240v code#
of the non-heating lead should be embedded per National Electrical Code (NEC) 424.41(D). Often, contractors will incorrectly place the power connection splice behind the wall, which does not meet electrical code. In order to dissipate heat correctly, the power connection splice has to be encased in mortar. Verify power connection splice placement: If it is determined via resistance readings that the cables have not been damaged, the next step would be to make sure the power connection splice is embedded with the heating cable. Conversely, applying 120V to heating cables that are specified for 240V will not produce enough heat to maximize comfort. Applying 240V to a heating cable that is specified for 120V-known as over-voltage- will cause the cable to overheat and melt, damaging the system. Next, ensure the correct voltage is supplied to the in-floor electric heating cables.
If the resistance value is not within ☑0% of what is printed on the tag, or there is resistance when measuring to ground, the cable may be damaged. Measure the resistance of each conductor to ground, and there should be an open circuit. The Ohm value of the resistance conductor-to-conductor should be within ☑0% of what is printed on the manufacturer’s tag. Take a resistance reading:To ensure the cables have not been damaged, complete a resistance reading on the cable using an ohmmeter or multimeter.Alterations to the floor (if not handled properly) can also inadvertently cause damage to the cables. Even simple nicks or cuts can cause the system to fail in the future. Almost 99% of the time, the reason that an electric radiant floor heating system would eventually stop working a couple of months after installation is because of damage to the cable element during installation.
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