King Electric SRK08 GFEP device kit - Manual (Page 11)

Model Volts
Output at
32ºF (0ºC)
Maximum
Single Run
Length
SR123 120V 5.0 w/ft 273 ft. (83M)
SR125 120V 8.0 w/ft 216 ft. (66M)
SR128 120V 12.1 w/ft 171 ft. (52M)
SR1210 120V 14.8 w/ft 152 ft. (46M)
Rev 11.04.12 www.king-electric.com 11
Technical Data Table
Maximum operating temp. 150°F (65°C)
Maximum exposure temp. 185°F (85°C)
Minimum installation temp. 0°F (-18°C)
Minimum bending radius 1”, (24 mm)
Dimensions
.496” x .236”
(12.6mm x 6mm)
Service voltage
110-120V,
208V-277V
Cable Volts
Start up
Temp
15 Amp
(ft.)
20 Amp
(ft.)
30 Amp
(ft.)
40 Amp
(ft.)
SR123 120V
32ºF (0ºC) 273 273 273 273
20ºF (-7ºC) 254 268 273 273
0ºF (-18ºC) 213 255 273 273
-20ºF (-29ºC) 182 248 273 273
SR125 120V
32ºF (0ºC) 188 216 216 216
20ºF (-7ºC) 166 216 216 216
0ºF (-18ºC) 144 193 216 216
-20ºF (-29ºC) 127 173 216 216
SR128 120V
32ºF (0ºC) 126 168 171 171
20ºF (-7ºC) 118 157 171 171
0ºF (-18ºC) 103 136 171 171
-20ºF (-29ºC) 92 123 168 171
SR1210 120V
32ºF (0ºC) 102 143 152 152
20ºF (-7ºC) 97 126 152 152
0ºF (-18ºC) 88 117 152 152
-20ºF (-29ºC) 76 104 152 152
Table 9: Circuit Breaker Protection for Deicing Table 10: Technical Data Ratings
Table 11: Maximum Single Run Length
Technical Data Notes:
1. The maximum single cable run is the longest length of heating cable before there is a
significant voltage drop which will lower the wattage rating of the cable.
2. The circuit breaker sizes in Table 9 are per the National Electric Code (NEC).
3. The NEC requires ground-fault equipment protection (GFEP) for fixed outdoor deicing
equipment. All electrical connections should be made by a licensed electrician.
Circuit Breaker Protection and Cable Length Design for Deicing