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46
5
Control, Monitoring and Power
Distribution
Raychem-IM-H58067-IceStopRoofGutterDeIcingCOM-EN 18/01
N
Three-pole
main contactor
Fuse
Main circuit breaker (optional)
Incoming
power
GND
24 V
One-pole with 30 mA
ground-fault trip (277 V)
Remote annunciation alarm
(circuit breaker
with alarm type #3)
GIT-1
CIT-1
SIT-6E
Braid
Aerial
snow sensor
Gutter
ice sensor
Slab
temperature
sensor
Pavement-
mounted
sensor
Single Ø
connection
SNOW/ICE
SUPPLY
EUR-5A SNOW SWITCH
AUTOMATIC SNOW/ICE MELTING CONTROL PANEL
HEATER
HEATER
CYCLE
HOURS
0
45
°
F
50
°
F
55
°
F
60
°
F
65
°
F
70
°
F
75
°
F
80
°
F
85
°
F
2
4
6
8
10
TEMPERATURE
Control transformer
Figure 26: Typical wiring diagram of group control with
SMPG1
Control and Feed Wiring
The controls and feed wiring must be in place prior
to system startup.
• Use a 30 mA trip level ground-fault equipment
protection device for each circuit.
• Power the system with the appropriate voltage.
• Add conduit drains at power connection so water
does not accumulate in junction boxes.
• Be sure the contactor being used is appropriate
for the load. If the controller is being used directly,
be sure that it is rated for the load and that all
requirements for disconnects are followed.
• Test control for proper operation (see "Tests" on
page 52).