Power Cables; Table 1 Table; Table 1; Table 2 Distance From Floor To Connection Point On The Equipment - Liebert NX User Manual

Single Module UPS Installation
1.6

Power Cables

The cable design must comply with the voltages and currents provided in this section, follow local wir-
ing practices and take into consideration the environmental conditions (temperature and physical
support media).
For cable entry terminal, refer to Figure 22.
WARNING
!
Before starting the UPS, ensure that you are aware of the location and operation of the
external isolators that connect the ups input/bypass supply to the mains distribution panel.
Check that these supplies are electrically isolated and post any necessary warning signs to
prevent their inadvertent operation.
WARNING
!
Failure to follow adequate earthing procedures may result in electromagnetic interference or
in hazards involving electric shock and fire.

Table 1

Maximum steady state AC and DC currents
Input Mains Current
With Full Battery
UPS
Rating
(kVA) 380V
10 22
15 33
20 44
30 63
1. Input mains current listed for common rectifier and bypass AC input. For split input the rectifier current is 94% of the currents
listed.
2. Non-linear loads (switch mode power supplies) affect the design of the output and bypass neutral cables. The current
circulating in the neutral cable may exceed the nominal phase current. A typical value is 1.5 In.
3. Protective earth cable: Connect each cabinet to the main ground system must follow the most direct route possible.
The earth conductor shall be sized in accordance with the AC supply fault rating, cable lengths and type of protection. Typical
cross sectional areas are 2.5mm
4. When sizing battery cables, a maximum volt drop of 4 VDC is permissible at the current ratings given in Table 1. The load
equipment is generally connected to a distribution board containing individually protected busbars rather than connected
directly to the UPS output. The output cables from paralleled units to the parallel distribution bus should be of same length so
as to optimise the sharing of current. Do not form coils, so as to minimise the formation of electromagnetic interference.
5. For terminal location – refer to 4.0 - Installation Drawings)
Table 2 Distance from floor to connection point on the equipment
UPS
Rectifier A.C. Input supply
Bypass A.C. Input supply
UPS Output A.C.
Battery Power
Auxiliary cables: Monitor board (U2)
Nominal Current, Amps
1,2
Output Current
Recharge at Full Load
3ph + N
400V 415V 380V
21 20 15
32 31 22
43 42 30
62 61 45
2
(10kVA), 6mm
Minimum Distance
2
3ph + N
Battery at
End of
400V 415V Discharge
14 13 22
21 20 33
29 28 44
44 42 66
2 2
(15kVA), 10mm (20kVA), 16mm2 (30kVA), as per AS / IEC 60950-1
mm (in.)
284 (11-1/5)
284 (11-1/5)
369 (14-1/2)
369 (14-1/2)
1104 (43-1/2)
8
Busbar Stud Size
Input/Output/
Bypass
Cables
External
Hole battery
Dia. Cables
Bolt (mm) (Bolts)
M6 6 M6
Torque
Load
(Nm)
5