• Size PE cable:
• For supply cables up to AWG8: same size as the supply cables
• 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
= 128 A, maximum ambient temperature is 45 °C,
recommended fuse = 150 A
• Single supply cables (3 phases + 1 PE - configuration (1)):
• I = 128 A + 25 % = 128 x 1.25 = 160 A
• For AWG2/0, the maximum current is 175 A, which is sufficient => use AWG2/0
• Install the prescribed maximum fuse (150 A) on each cable
• Parallel supply cable (2 x 3 phases + 2 PE - configuration (2)):
• I = (128 A + 25%)/2 = (128 x 1.25)/2 = 80 A
• For a AWG4, the maximum current is 85 A x 0.8 = 68 A, which is insufficient. For an AWG3,
the maximum current is 100 x 0.8 = 80 A. So 2 parallel cables of 3 x AWG3 + 2 x AWG8 are
sufficient.
• Install 80 A fuses on each cable.
9.3 Reference conditions and limitations
Reference conditions
Air inlet pressure (absolute) bar 1
Air inlet pressure (absolute) psi 14.5
Air inlet temperature ˚C 20
Air inlet temperature ˚F 68
Relative humidity % 0
Working pressure See section Compressor data.
Limitations
Maximum working pressure See section Compressor data.
Minimum working pressure bar(e) 5.5
Minimum working pressure psig 80
Maximum air inlet temperature ˚C 46
Maximum air inlet temperature ˚F 115
Minimum ambient temperature ˚C 1
Minimum ambient temperature ˚F 34
Instruction book
124 2920 7109 23
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