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47
5
Control, Monitoring and Power
Distribution
Raychem-IM-H58067-IceStopRoofGutterDeIcingCOM-EN 18/01
TABlE 8: MAxIMUM CIRCUIT lENGTH IN FEET (METERS)
15 A and 20 A
Heating
cable
Start-up
temperature
Circuit breaker size Max.
A/ft
Max.
A/m
15 A
20 A
GM-1X &
GM-1XT at
120 V
32°F
(0°C)
100 (30)
135 (41)
0.120 0.394
20°F (–7°C)
95 (29)
125 (38)
0.126 0.414
0°F (–18°C)
80 (24)
100 (30)
0.150 0.492
GM-2X &
GM-2XT at
208 V
32°F
(0°C)
190 (58)
250 (76)
0.063 0.207
20°F (–7°C)
180 (55)
235 (72)
0.067 0.220
0°F (–18°C)
145 (44)
195 (59)
0.083 0.272
GM-2X &
GM-2XT at
240 V
32°F
(0°C)
200 (61)
265 (81)
0.060 0.197
20°F (–7°C)
190 (58)
250 (76)
0.063 0.207
0°F (–18°C)
155 (47)
205 (62)
0.077 0.253
GM-2X &
GM-2XT at
277 V
32°F
(0°C)
215 (66)
290 (88)
0.056 0.184
20°F (–7°C)
200 (61)
265 (81)
0.060 0.197
0°F (–18°C)
165 (50)
225 (69)
0.073 0.240
30 A and 40 A
Heating
cable
Start-up
temperature
Circuit breaker size Max.
A/ft
Max.
A/m
30 A
40 A
1
GM-1X &
GM-1XT at
120 V
32°F
(0°C)
200 (61)
—
0.120 0.394
20°F (–7°C)
185 (56) 200 (61)
0.126 0.414
0°F (–18°C)
155 (47) 200 (61)
0.150 0.492
GM-2X &
GM-2XT at
208 V
32°F
(0°C)
380 (116)
—
0.063 0.207
20°F (–7°C)
355 (108) 380 (116)
0.067 0.220
0°F (–18°C)
290 (88) 380 (116)
0.083 0.272
GM-2X &
GM-2XT at
240 V
32°F
(0°C)
400 (122)
—
0.060 0.197
20°F (–7°C)
370 (113) 400 (122)
0.063 0.207
0°F (–18°C)
305 (93) 400 (122)
0.077 0.253
GM-2X &
GM-2XT at
277 V
32°F
(0°C)
415 (126)
—
0.056 0.184
20°F (–7°C)
400 (122) 415 (126)
0.060 0.197
0°F (–18°C)
330 (101) 415 (126)
0.073 0.240
1
Only FTC-P power connection, FTC-HST splice/tee, and RayClic-E end
kits may be used with 40-amp circuits.