Section IX - Technical data
96
Quincy Compressor
8
50 A
6
65 A
4
85 A
3
100 A
2
115 A
1
130 A
Correction factors
Ambient temperature
Correction factor
21-25 °C (70-77 °F)
1.05
26-30 °C (78-86 °F)
1.00
31-35 °C (87-95 °F)
0.94
36-40 °C (96-104 °F)
0.88
Calculation method for UL:
• Single supply cables (3 1 PE - configuration (1)):
• Add 25 % to the total current (Itot from the tables) (see UL 508A 28.3.2: “Ampacity
shall have 125 % of the full load current”).
• Install the prescribed maximum fuse on each cable
• Parallel supply cable (2 x 3 2 PE - configuration (2)):
• Add 25 % to the total current (Itot from the tables) and divide by 2
• Multiply the ampacity of the cables with 0.8 (see UL 508A table 28.1 continued)
• Install fuses of half the size of the recommended maximum fuse size on each cable.
• When using 2 x 3 phase + 2 PE as in (3):
• Add 25 % to the total current (Itot from the tables) and divide by
√
3
• Multiply the ampacity of the cables with 0.8 (see UL 508A table 28.1 continued)
• Fuse size: the recommended maximum fuse size divided by
√
3 on each cable.
• 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
= 28 A, maximum ambient temperature is 40°C,
recommended fuse = 40
• Single supply cables (3 1 PE - configuration (1)):
• I = 28 A + 25 % = 28 x 1.25 = 35 A
