APC 6000 Number Total UPS Mains 2 or load, Line current, KVA Inverters Amps Copper

Characteristics (cont.)

The table opposite serves as an example for an installation with up to four modular UPSs with an external maintenance bypass.

◗for installations with redundant units, take into account only the units required to supply the load power (e.g. for an installation made up of 3 parallel-connected rectifier-inverter cubicles, one being redundant, only 2 units are used to determine the currents on the maintenance bypass line and the load, and the cross- sectional areas of cables);

◗this table has been drawn up for rated phase-to-phase Mains 2 and load voltages of 415V and full rated load with a power factor of 0.8. For voltages of 380 or 400V, multiply the indicated currents by 1.09 and 1.04 respectively, then modify the cable cross-sections accordingly if necessary.

The cable cross-sections in this table are for the parts illustrated in bold on the following block diagrams (installation example, figure 3);

◗important. In an installation with an external maintenance bypass, the power cables between each UPS and the upstream protection devices must be the same length. The same holds for the power cables between each UPS cubicle and the external maintenance bypass.

Parameters for connection of the external maintenance bypass circuit and the load in an installation comprising modular UPSs

rated inverter	number of	total UPS	Mains 2 or load	cable cross-section
output	parallel-connected	rated output	line current	(1) in mm2
in kVA	inverters	in kVA	in Amps	Copper	Aluminium
250	2	500	722	2 x 185	2 x 300
	3	750	1082	3 x 300	4 x 240
	4	1000	1444	4 x 240	4 x 400
300	2	600	866	2 x 240	4 x 185
	3	900	1299	4 x 240	4 x 400
	4	1200	1732	Please consult us*
400	2	800	1154	4 x 185	4 x 300
	3	1200	1731	Please consult us*
	4	1600	2308	Please consult us*
450	2	900	1299	4 X 240	4 x 400
	3	1350	1948	Please consult us*
500	2	1000	1444	4 X 240	4 x 400
	3	1500	2166	Please consult us*
(1) cable cross-sections are given for copper			NF C 15-100 authorizes a maximum of 4
conductors of the U1000 R02V type. They are

calculated according to permissible temperature	cables per phase.
rise and allow for line voltage drops over a
maximum length of 100 m. For greater lengths,
the cross-sections should be chosen to limit
voltage drops to 3%.

Installation comprising modular UPSs with an external maintenance bypass

maintenance Bypass cubicle

mains 1	inverter 1
mains 2
mains 1	inverter 2	load
mains 2
mains 1	inverter 3
mains 2

Fig. 3

6739381EN/