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51
6
Commissioning and Preventive
Maintenance
Raychem-IM-H58067-IceStopRoofGutterDeIcingCOM-EN 18/01
6.3
Continuity Test
The continuity test is useful in determining if the
heating cable is damaged or was not connected
correctly. This test can be performed as part of the
troubleshooting procedure.
Important: Some of the heating cable connection
kits, such as the end seal kit and power connection,
splice, and tee kits, which utilize heat-shrink tubings,
are not reenterable and must be replaced after this
test is done.
WARNING: Shock or Fire Hazard. Disconnect
power to all circuits prior to testing.
1. Disconnect all power to heating cable, thermo-
stat, 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 improp-
erly installed connection kits.
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
connection kits on the circuit prior to re-energiz-
ing the circuit.
6. Reconnect the contactor or thermostat and re-
energize the circuit.