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Specification/Application Information
Performance and Rating Data
Catalog Number
SR51J
SR52J
Voltage (VAC)
120
208/240/277
Nominal Power Output in Ice (W/ft) 8.0
7.0/8.0/10.0
Maximum Single Cable Length (ft)
190
381
Current Load (Amp/ft)
at 0°F (-20°C) start-up
.132
.066
at -20°F (-30°C) start-up
.147
074
Minimum Installation Temp: -40° F (-40°C)
Perform Maximum total Heater Length (ft)/Circuit Breaker Rating
20°F(-7°C)/0°F(-20°C)/-20°F(-30°C) Start-up ance and Rating Data
Catalog Number
SR51J
SR52J
15 Amp Breaker
125/115/100
250/225/205
20 Amp Breaker
170/150/135
335/300/270
30 Amp Breaker
250/225/205
500/455/405
The use of ground fault equipment protection for heating
cable applications is required by NEC.
Table 1: Determination of Total Cable Requirements
Items
Cable Required
Roof Edge
From Table 2 based on eave
overhang
Gutter
1 ft of cable per foot of gutter (if gut-
ter is wider than 6", use 2 traces)
Downspout
2 ft of cable per foot of downspout–
cable is looped down and back
Roof Valley
6 ft of cable per valley–loop 3' up val-
ley and back
Dormer Perimeter
1 ft of cable per foot of dormer pe-
rimeter
Table 2: Cable Length Factors vs. Roof Overhang
Eave
Overhang
"E"
Loop
Height
"H"
Length Factor
Shingle Roof
Length Factor
Metal Roof
12"
18"
1.9
2.5
24"
30"
2.7
3.5
36"
42"
3.6
4.5
48"
54"
4.6
5.5
(Note 3)
Cable length required = Length Factor x Roof Length
1. Standard shingle roof (see diagram pg. 4).
2. Metal roof (see diagram pg. 4).
3. Cable length calculated above does not include
cable for gutter or downspout.
For other designs, contact representative.
Cable Sizing
The total heater cable length for deicing is determined by including all elements of the roof system that need protection. Use the following
charts to determine the total length of cable.
Cable Control
The Easy Heat SR cable can be controlled in several
different ways. The simplest method is to use a standard wall switch,
turning the switch on only when snow/ice melting is required. It is
recommended that a pilot light also be installed to remind the user
when the cable is energized.
It is also possible to install controls which automatically sense when
show/ice melting is required, energizing cables accordingly. Contact
Easy Heat for details.
