Thermon Electric Heat Tracing - Manual (Page 9)

Cable Testing Report
1. Refer to these Installation Procedures for general installation procedures, requirements and guidelines.
2. Upon receiving heating cable, check the cable to make sure the proper type and output have been received. All fl exible
cables have the catalog number, voltage rating and watt output printed on the outer jacket.
3. Visually inspect cable for any damage incurred during shipment. The heating cable should be tested to ensure electrical
integrity with at least a 500 Vdc megger between the heating cable bus wires and the heating cable metallic braid.
IEEE 515 and EN-IEC 60079-30 recommend that the test voltage for polymer insulated heating cables be 2500 Vdc.
Minimum resistance should be 20 megohms.
(Record 1 on Insulation Resistance Test Page 9 and 10)
A. Connect the positive lead of the megger to the cable bus
wires.
B. Connect the negative lead of the megger to the metallic braid.
C. Energize the megger and record the reading. Readings
between 20 megohms and infi nity are acceptable. Readings
below 20 megohms may mean the electrical insulation has
been damaged. Recheck the heating cable for physical damage between the braid and the heating element; small cuts or
scuffmarks on the outer jacket will not affect the megger reading unless there was actual penetration through the braid
and dielectric insulation jacket.
4. Once the installation is complete, but prior to installation of thermal insulation, recheck the heating cable with at least a
500 Vdc megger between the heating cable bus wires and the heating cable metallic braid. IEEE 515 and EN-IEC 60079-30
recommend that the test voltage for polymer insulated heating cables be 2500 Vdc. Minimum resistance should be 20
megohms. (Record 2 on Insulation Resistance Test Page 9 and 10)
5. After the thermal insulation is installed, the insulation resistance test should be repeated. Minimum resistance should be 5
megohms. (Record 3 on Insulation Resistance Test Page 9 and 10.) For Series Heating Cables, measure the electric loop
resistance and record measured Ohms (Record 3, Page 10.)
6. After the thermal insulation is installed and power supply is completed, record the panel and circuit breaker information.
Ensure all junction boxes, temperature controllers, cable glands, etc. are properly secured. Set the temperature controller
(if applicable) to the manual setting and apply rated voltage to the heat tracing circuit(s) for 5 minutes. Record the ambient
temperature, measure and record the circuit(s) voltage and current.
(Record 4 on Insulation Resistance Test Page 9 and 10)
NOTE: To ensure the heating cable warranty is maintained through installation, the testing outlined
on this sheet must be completed on the installed heating cables.
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