Quincy QSV 2200, Инструкция по эксплуатации

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Section IX – Technical data
Quincy Vacuum Pump-QSV Series 111

For a cable of 25 mm², B2 at 45 °C, the maximum current is 63 A x 0.8 = 50.4 A. So 2 parallel cables
of 3 x 25 mm² + 25 mm² are sufficient.

Install 50 A fuses on each cable instead of 100 A.
Cable sizing according UL/cUL
Calculation method according UL 508A, table 28.1 column 5: allowable ampacities of insulated copper
conductors (75°C (167°F)).Maximum allowed current in function of the wire size
AWG or kcmil Maximum current
10 < 30 A
8 < 50 A
6 < 65 A
4 < 85 A
3 < 100 A
2 < 115 A
1 < 130 A
1/0 < 150 A
2/0 < 175 A
3/0 < 200 A
Calculation method for UL:

Single supply cables (3 1 PE - configuration (1)):

Add 25% to the total current from the tables (see UL 508A 28.3.2: “Capacity 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 from the tables and divide by 2

Multiply the capacity 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 from the tables and divide by
√3

Multiply the capacity 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 capacity.
< 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: Itot= 128 A, maximum ambient temperature is 45 °C,
recommended fuse = 150 A.

Single supply cables (3 1 PE - configuration (1)):

I = 128 A + 25 % = 128 x 1.25 = 160 A