• For supply cables larger than AWG8: use maximum allowed ampacity of the selected
supply cables and compare with value in table below (see CEC Part 1 table 17)
< 100 A: use AWG8
< 200 A: use AWG6
< 300 A: use AWG4
Always check the voltage drop over the cable (less than 5 % of the nominal voltage is
recommended).
Example of supply cable calculation:
I
tot
= 28 A, maximum ambient temperature is 40°C,
recommended fuse = 40 A
• Single supply cables (3 phases + 1 PE - configuration (1)):
• I = 28 A + 25 % = 28 x 1.25 = 35 A
• For AWG8, the maximum current at 40 °C is 50 A x 0.88 = 44 A, which is sufficient =>
use AWG8.
• Install the prescribed maximum fuse (40 A) on each cable
• Parallel supply cable (2 x 3 phases + 2 PE - configuration (2)):
• I = (28 A + 25%)/2 = (28 x 1.25)/2 = 17.5 A
• For a AWG14, the maximum current at 40 °C is 20 A x 0.88 x 0.8 = 14.1 A, which is
insufficient. For an AWG14, the maximum current is 25 x 0.88 x 0.8 = 17.6 A. So 2
parallel cables of 3 x AWG12 + 2 x AWG12 are sufficient.
• Install 20 A fuses on each cable.
9.2 Reference conditions and limitations
Reference conditions
Air inlet pressure (absolute) bar 1
Air inlet pressure (absolute) psi 14.5
Air inlet temperature ºC 20
Air inlet temperature ºF 68
Relative humidity % 0
Working pressure See section Compressor data
Limits
Maximum working pressure See section Compressor data
Maximum inlet temperature ºC 40
Maximum inlet temperature ºF 104
Minimum ambient temperature ºC 0
Minimum ambient temperature ºF 32
Instruction book
102 2920 7140 52
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