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34006451EN/AC - Page 7
Characteristics
1.5 Electrical parameters for determining cable cross-sections
Parameters for single-unit UPS cables
Copper conductors
Aluminium conductors
– 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.
rated
inverter
output
in kVA
line currents absorbed in Amps cross-sectional area of cables in mm
2
(2)
Mains 1 415 V
Mains 2
and load
battery Mains 1 415 V
Mains 2
and load
battery
with or
without
battery (1)
with or
without
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
rated
inverter
output
in kVA
line currents absorbed in Amps cross-sectional area of cables in mm
2
(2)
Mains 1 415 V
Mains 2
and load
battery Mains 1 415 V
Mains 2
and load
battery
with or
without
battery (1)
with or
without
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).