Quincy QSV 2200, Instruction Manual

Page: 110 / 124

Section IX – Technical data
110 Quincy Vacuum Pump-QSV Series
Installation method F according table B.52.1. Single-core
cables, touching in free air Clearance to wall not less than one
cable diameter
Maximum allowed current in function of the ambient temperature for installation method F
Calculation method for IEC:

Single supply cables (3 PE - configuration (1)):

Add 10% to the total vacuum pump current (Itot from the tables)

Install the prescribed fuse on each cable

Parallel supply cable (2 x 3 PE - configuration (2)):

Add 10% to the total vacuum pump current (Itot from the tables) and divide by 2

Multiply the ampacity of the cables with 0.8 (see table A.52.17 (52-E1))

Install fuses of half the size of the recommended maximum fuse size on each cable.

When using 2 x 3 PE as in (3):

Add 10% to the total vacuum pump current (Itot from the tables) and divide by
√3

Multiply the ampacity of the cables with 0.8 (see table A.52.17 (52-E1))

Fuse size: the recommended maximum fuse size divided by
√
3 on each cable.

Size of the PE cable:

For supply cables up to 35 mm²: same size as supply cables

For supply cables larger than 35 mm²: half the size of the supply wires
Always check the voltage drop over the cable (less than 5% of the nominal voltage is recommended).
Example: Itot= 89 A, maximum ambient temperature is 45 °C, recommended fuse = 100 A

Single supply cables (3 PE - configuration (1)):

I = 89 A + 10% = 89 x 1.1 = 97.9 A

The table for B2 and ambient temperature = 45 ° C allows a maximum current of 93 A for a 50 mm²
cable. For a cable of 70 mm², the maximum allowed current is 118 A, which is sufficient. Therefore,
use a 3 x 70 mm² + 35 mm² cable. If method C is used, 50 mm² is sufficient. (35 mm² for method F)
=>cable 3 x 50 mm² + 25 mm².

Parallel supply cable (2 x 3 PE - configuration (2)):

I = (89 A + 10%)/2 = (89 x 1.1)/2 = 49 A