PIPe FReeze PROTeCTIOn AnD FLOW MAInTenAnCe
42 of 44
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H55838 2/12
Step
Determine the electrical parameters
Determine maximum circuit length and number of circuits
See Table 9 and Table 10 .
Determine transformer load
See Table 11 and Table 12 .
201 ft
315 ft
1.6 circuits, round up to 2
315 ft of 5XL1-CR
−20°F
201 ft
/
=
Number of circuits
Maximum heating cable circuit length
Total heating cable length required
T
120 V
T
208 V
T
240 V
T
277 V
Total heating cable length required
Supply voltage:
T
15 A
T
20 A
T
30 A
T
40 A
Circuit breaker size:
Minimum start-up temperature
Maximum circuit length
/
=
Number of circuits
Maximum heating cable circuit length
Total heating cable length required
T
120 V
T
208 V
T
240 V
T
277 V
Total heating cable length required
Supply voltage:
T
15 A
T
20 A
T
30 A
T
40 A
Circuit breaker size:
Minimum start-up temperature
Maximum circuit length
Example:
9
9
x
/ 1000 =
Transformer
load (kW)
0.119 A/ft
315 ft
120 V
4.5 kW
Max A/ft at minimum start-up temperature
Heating cable length
x
Supply voltage
Example:
x
/ 1000 =
Transformer
load (kW)
Max A/ft at minimum start-up temperature
Heating cable length
x
Supply voltage