Heating Cable Tests
Test 1: Conductor resistance test
In order to perform the resistance test, you must set your multimeter for resistance
measurement and take an ohms reading between the two power leads. If the ohms reading
taken on the two power leads varies significantly (10% or more) from the value printed on the
spool, it either means that the cable has been damaged, or that the measuring instrument
is not set properly, or that it is simply out of calibration. The ohms measurement must be
recorded in your heating cable tests log (page 26).
Test 2: Continuity between the braid and the two conductors
The heating cable is protected by a ground braid. An electrical insulator prevents any
contact between the braid and the two conductors. To make sure there is no contact
between the braid and the two conductors, you must perform a continuity test. Using
the continuity test (buzzer logo) function of your multimeter, test your cable between the
braid and one of the two power leads. If there is no continuity (if the test is successful),
the multimeter will display, depending on the instrument used, either “OL ” for “over load”
or “I” for “infinity”. Otherwise, if the test fails, neither “OL ”, nor “I” will be displayed and a
warning tone will be heard. The test result must be recorded in your heating cable tests
log (page 26).
Test 3: Insulation resistance test
This test is meant to detect very small breaks throughout the cable insulation. These breaks
often remain undetected during the continuity test since they are not necessarily short circuits
between the conductor and the ground braid. Even though they are small, these breaks
are likely to cause a current leakage to ground. Such a leakage is usually detected by the
mandatory ground-fault circuit interrupter “GFCI” (thermostat with integrated GFCI or panel
mount GFCI). When a current leakage is detected, the GFCI trips the circuit, thus disabling
the floor heating system. In order to perform the insulation resistance test, you must, using
a megohmeter (Mohm logo), take an insulation measurement between the braid and one
of the two power leads. Make sure the megohmeter range is set at 1000 V. The insulation
resistance measurement must be equal to or greater than 1 Gigaohms (1 Gigaohms = 1 G
ohms = 1000 M ohms = 1000 Mega ohms). The insulation resistance measurement must be
recorded in your heating cable tests log (page 26).
DITRA-HEAT Thermostat Floor Temperature Sensor Testing
Test the floor temperature sensors using a multimeter to verify accuracy of the sensors. Set the multimeter for resistance at 10K Ω +/- 2
(at room temperature) and take a reading between the sensor leads. The resistance will vary according to the temperature (i.e., the colder
the sensor, the higher the resistance). Compare the measured values with the table of expected values and record in the heating cable
tests log on page 26.
INSTALLATION 17
To avoid damaging the DITRA-HEAT-E-HK heating cable spool due to handling, we recommend turning the box over to
remove the spool from the packaging box. Then pick up the spool from underneath the heating cable coil, but not by the
cardboard washers.
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(34 pages)
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