Advertisement
Specification/Application Information
Performance and Rating Data
Catalog Number
Voltage (VAC)
Nominal Power Output in Ice (W/ft) 8.0
Maximum Single Cable Length (ft)
Current Load (Amp/ft)
at 0°F (-20°C) start-up
at -20°F (-30°C) start-up
Minimum Installation Temp: -40° F (-40°C)
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.
Table 1: Determination of Total Cable Requirements
Items
Cable Required
From Table 2 based on eave
Roof Edge
overhang
1 ft of cable per foot of gutter (if gut-
Gutter
ter is wider than 6", use 2 traces)
2 ft of cable per foot of downspout–
Downspout
cable is looped down and back
6 ft of cable per valley–loop 3' up val-
Roof Valley
ley and back
1 ft of cable per foot of dormer pe-
Dormer Perimeter
rimeter
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.
SR51J
SR52J
120
208/240/277
7.0/8.0/10.0
190
381
.132
.066
.147
074
www.easyheat.com
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
15 Amp Breaker
125/115/100
170/150/135
20 Amp Breaker
250/225/205
30 Amp Breaker
The use of ground fault equipment protection for heating
cable applications is required by NEC.
Table 2: Cable Length Factors vs. Roof Overhang
Eave
Loop
Overhang
Height
"E"
"H"
12"
18"
24"
30"
36"
42"
48"
54"
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.
It is also possible to install controls which automatically sense when
show/ice melting is required, energizing cables accordingly. Contact
Easy Heat for details.
SR52J
250/225/205
335/300/270
500/455/405
Length Factor
Length Factor
Shingle Roof
Metal Roof
1.9
2.5
2.7
3.5
3.6
4.5
4.6
5.5
(Note 3)
Advertisement
