6 | nVent.com
4. Install heating cable end seals, splices, tees, and power
connection
• Using a megohmmeter, test each circuit before installing the
H908 ground-fault device, according to the instructions in the
“Heating cable testing and maintenance” section.
• Install all end seals, splices, tees, and power connection prior
to plugging in.
• Follow the H908 kit installation instructions beginning on
page 8.
• Use only weatherproof receptacles approved for wet locations
when installing WinterGard Wet H612 heating cable with the
H908 Power Connection Kit for Roof and Gutter De-Icing
Applications.
5. Mark the installation
• Two labels indicating the presence of electric de-icing and
snow-melting equipment on the premises are included with this
unit. One label must be posted at the electrical outlet cover. The
other label must be posted at the fuse or circuit breaker panel.
The labels must be clearly visible.
6. Check the installation
• Prior to powering, check to be sure the heating cable is free of
mechanical damage (cuts, clamps, etc.).
• Visually check all power connections, end seals, splices, and
tees for proper installation.
7. Test the ground-fault protection
• Verify the H908 ground-fault device is functioning correctly,
according to the instructions in the “Heating cable testing and
maintenance” section.
• Using a megohmmeter, test each circuit according to the
instructions in the “Heating cable testing and maintenance”
section (page 4) both before and after installing the thermal
insulation.
HEATING CABLE TESTING AND MAINTENANCE
Make sure that gutter and downspouts are free of leaves and
other debris prior to the winter season.
Using a 2500-Vdc megohmmeter (Megger) test the WinterGard
Wet heating cable circuit prior to installing the H908 ground-
fault device but after installing any splices, tees and end seals.
Measure the insulation resistance between the heating cable
bus wires and the copper braid. If the readings are less than
1000 megohms, inspect heating cables for signs of damage and
verify the components are correctly installed.
If physical damage is found, the entire damaged section must
be removed and a new section of heating cable spliced in using
only approved H910 splice kits.
If physical damage cannot be found, the complete circuit should
be removed and replaced with new heating cable.
To verify the ground-fault circuit is functioning, test the H908
before each use. Push in the test button. The indicator light
must turn off. Then press the reset button. If the light goes
back on, the device is ready to use. Do not use the device if the
indicator light does not go on when the device is reset or if the
indicator light remains on when the test button is pushed.
Test the H908 functionality before each winter season or more
often as required by local code.
WARNING: Shock and Fire Hazard. Damaged heating cable
or components can cause electrical shock, arcing, and fire.
Do not attempt to energize damaged cable or components.
Replace them immediately using a new length of heating
cable and the appropriate WinterGard accessories.
ELECTRICAL PROTECTION
Voltage rating
H612
110–120 Vac
Ground fault protection:
The H908 plug contains a built-in 27-mA equipment-protection
ground-fault device. This kit provides ground-fault protection of
equipment only. It does not protect people against the hazards of
electrical shock.
Do not use an extension cord. Plug the unit directly into the outlet.
Note: nVent and the national electrical codes require ground-fault
protection of equipment for de-icing systems.
Table 6. Maximum heating cable circuit length for roof and
gutter de-icing, downspouts and refrigeration
condensate drains
Circuit
breaker
rating (A)
Maximum heater length
(ft) per circuit at start-up
temperature
Heating cable type
0°F
32°F
WinterGard Wet 120 V H612
in downspout and refrigeration
condensate drains
15
100
125
Note: Maximum circuit lengths are based on start-up load. Steady-state
amps per foot is dependent upon heating cable temperature.
Table 7. Product data—WinterGard Wet H612 for roof and gutter de-icing only
Service voltage (V)
120
Thermal output at 32°F (W/ft) (in ice and snow)
8
Weight per 100 ft (lb)
9
Minimum installation temp. (°F)
0
Maximum exposure temp. (°F)
150
Exposure to chemicals
None
Environment
Use only in ordinary (nonhazardous) areas.
