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 (Cont’d.)
Insulation Resistance Criteria
A clean, dry, properly installed circuit should measure thousands of
megohms, regardless of the heating cable length or measuring voltage (0-
2500 Vdc). The following criteria are provided to assist in determining the
acceptability of an installation where optimum conditions may not apply:
•
All three insulation resistance values should be greater than 20
megohms.
•
Insulation resistance values for any particular circuit should not
vary more than 25% as a function of measuring voltage.
•
Reading must be steady at measuring voltage.
•
If any of these conditions are not met, consult the
“Troubleshooting” instructions on Pages 24-25.
Continuity Test
This continuity test is useful in determining if the heating cable is
damaged or was not connected correctly. This test can also be performed
as part of the troubleshooting procedure. Note: some of the heating cable
components, such as the End Seal kit and heater cable power
connection, and splice/tee kits which utilize heat-shrink tubings, may not
re-enterable and will have to be replaced after this test is done.
1.
Disconnect all power to heating cable, thermostat, and contactor.
2.
Twist the two bus wires together at one end.
3.
Take a resistance reading from bus wire to bus wire at the other
end. The reading should be 3 ohms or less. High readings (above
1000 ohms) generally indicate bus wire damage or misconnected
components.
4.
If there are any tees on the circuit, each leg of the tee must be
tested separately.
5.
Be sure to untwist the bus wires and install new components on the
circuit prior to re-energizing the circuit.
6.
Re-connect the contactor or thermostat and re-energize the circuit.
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