APC 9000 installation manual Electrical parameters for determining cable cross-sections

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