NOTE: Prior to electrical hookup, test the electrical insulation resistance of
the heating cable. Every foot of heater cable provided by Summit Ice Melt
Systems has been tested and approved in the factory for insulation
integrity.
WARNING: Shock or fire hazard.
Disconnect power to all circuits prior to
testing.
Summit Ice Melt Systems
PO Box 6928, Tahoe City, CA 96145
Ph: 530-583-8888 Fax: 530-583-7777
www.SummitIceMelt.com
Electrical Testing
Megohmeter Test
The insulation resistance test is critical to ensure the safety and reliability
of the heating cable system. This test should be performed at four
stages: 1) when cable is received, 2) after cables are installed in system,
3) prior to initial startup, 4) as part of the regular system inspection.
Use a megohmeter, test insulation with 500 and 1000Vdc voltages. IEEE
515.1 recommends testing be done at 2500 Vdc, as some problems may
not be detected at lower voltages.
First, measure the resistance between the heating cable bus wires and
the grounding braid; then measure the insulation resistance between the
braid and the metal Eave Panel Cover, metal roofing, and gutter.
Testing Procedure
1.
Disconnect all power to the heating cable, thermostat, and contactor.
2.
Set test voltage 0 volts Vdc.
3.
Connect the negative lead (-) to the heating cable metallic braid.
4.
Connect the positive lead (+) to both heating cable bus wires.
5.
Turn on Megohmeter and set the voltage to 500 Vdc; apply the voltage
for 1 minute. Record the resistance in the Installation Log, Page 23.
6.
Repeat Step #5 for 1000Vdc (and the recommended 2500 Vdc).
7.
Turn off the Megohmeter.
8.
If the megohmeter does not self-discharge, discharge phase connection
to ground with a suitable grounding rod. Disconnect the megohmeter.
9.
Re-connect the thermostat or contactor and re-energize the system.
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