Characteristics

1.5Electrical parameters for determining cable cross-sections

this table has been drawn up for rated phase-to-phase Mains and load voltages of 415 V. For voltages of 380 V, multiply the currents for Mains 2 and load by 1.09; for voltages of 400 V, use the table in another language version of this manual;

the current values and cable cross-sections for Mains 1 are given for full rated load with a power factor of 0.9 and a battery consuming its minimum float charging voltage;

the battery current values and cable cross-sections have been determined for a battery at the end of a charge cycle;

the current values and cable sections for Mains 2 and load are given for full rated load with a power factor of 0.9.

For frequency converters, the parameters concerning Mains 2 are not applicable.

The load parameters common to all the converters are given in the table below.

For a parallel UPS, the parameters for Mains 2 and load are also provided in the table below.

For a modular UPS, the parameters for Mains 2 and load are also provided in the table below.

Parameters for single-unit UPS cables

Copper conductors

rated

line currents absorbed in Amps

 

cross-sectional area of cables in mm2 (2)

inverter

Mains 1

415 V

battery

Mains 1

415 V

battery

output

 

Mains 2

 

 

Mains 2

 

in kVA

with or

 

with or

 

and load

 

and load

 

 

 

 

 

without

 

without

 

 

 

 

 

 

 

battery (1)

 

 

battery (1)

 

 

 

 

 

 

 

 

 

800

1455

1155

2274

4 x 240

4 x 185

3 x 240

900

1455

1299

2274

4 x 240

4 x 240

3 x 240

Aluminium conductors

rated

line currents absorbed in Amps

 

cross-sectional area of cables in mm2 (2)

inverter

 

 

 

 

 

 

Mains 1

415 V

battery

Mains 1

415 V

battery

output

 

Mains 2

 

 

Mains 2

 

in kVA

with or

 

with or

 

and load

 

and load

 

 

 

 

 

without

 

without

 

 

 

 

 

 

 

battery (1)

 

 

battery (1)

 

 

 

 

 

 

 

 

 

800

1455

1155

2274

4 x 400

4 x 300

3 x 400

900

1455

1299

2274

4 x 400

4 x 400

3 x 400

(1)the rated Mains 1 currents (In) have been determined for a minimum float charging voltage of 423 V and full rated load with a power factor of 0.9.

(2)the cable cross-sections are calculated according to permissible temperature rise and allow for line voltage drops over a maximum length of 100 m (AC circuits) or 25 m (DC circuits if cables not provided). For greater lengths, the cross-sections should be chosen to limit voltage drops to 3 % (AC)

or 1 % (DC).

34006451EN/AC - Page 7

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APC 9000 Electrical parameters for determining cable cross-sections, Parameters for single-unit UPS cables