S1 and S2 Roof Heater Cable Maximum Circuit Lengths In Feet

Model Number Operating Voltage Start-up Temp Design Load
(Amps/foot) @ 0° F.
Startup
Circuit Breaker Size  
20A 30A 40A
S1 120 Vac 20° F. 135 175 175
0° F. 0.155 105 155 175
S2 208 Vac 20° F. 245 350 350
0° F. 0.083 190 290 350
S2 240 Vac 20° F. 250 350 350
0° F. 0.080 200 295 350
S2 277 Vac 20° F. 255 350 350
0° F. 0.077 205 310 350

Important: Ground fault protection is required for each circuit. Use only Summit Ice Melt Systems approved components for this type heating cable.
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S1 And S2 Heater Cable Construction, Specifications, and Approvals