Connecting The Ups Power Cables; Cable Entry; Cable Rating - Liebert 7200 Series User Manual

Chapter 3 - Insatallation Procedure

Connecting the UPS power cables

3.3 Connecting the UPS power cables
BEFORE CABLING-UP 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.
3.3.1

Cable entry

Cables enter the UPS modules via entry panels in the base of the cabinet. As shown in figure 3-2
separate entry positions are provided for power cables ( which include input, output and battery
supplies ) and control cables ( which includes battery control, remote stop and communication wiring ).
All control cables should be screened and run in a separate trunking to the power cables.
3.3.2

Cable rating

The input/output cables can be sized to suit the modules' rating according to the table below.
UPS
RATING Input Mains
(kVA) with full battery recharge
380V
64
30
( 16 )
85
40
( 25 )
128
60
( 35 )
2
( NN ) mm is the recommended minimum size according to BS7671 Table 4D1A (IEEE regs. 16th
Edition).
Notes:
1. The neutral conductor should be sized for 1,5 times the output/bypass phase current.
2. The earth conductor should be sized at 2 times the output/bypass conductor (this is dependent
on the fault rating, cable lengths, type of protection etc.).
3. Table 4D1A applies to single core PVC-insulated, non armored cable in a ambient temperature
of 30°C, according to fixing method 1, samples shown in figure 3-3.
4. These recommendations are for guideline purposes only and may be superseded by local
regulations and codes of practice.
Page 3-6
Issue 6
(03/98)
document in response to "powersure ups"
WARNING
NOMINAL CURRENT: Amps
Recommended Cable Size (mm
Bypass/output
at full load
400V 415V 380V
59 56 46
( 16 ) ( 16 ) ( 10 )
78 73 61
( 25 ) ( 25 ) ( 16 )
117 109 91
( 35 ) ( 35 ) ( 25 )
2
)
Battery
at min.
battery
voltage
400V 415V
44 42 82
( 10 ) ( 10 ) ( 25 )
58 56 110
( 16 ) ( 16 ) ( 35 )
87 84 163
( 25 ) ( 25 ) ( 50 )
7200 Series UPS User Manual
Single Module and 1+1 Parallel System
BUSBAR CONNECTION
STUD SIZE
Input/output Battery
Cable Terminations
Terminations
U - V - W - N +ve & -ve
M6 Bolt M8 Bolt
2
max. 50 mm max. 95 mm
M6 Bolt M8 Bolt
2
max. 50 mm max. 95 mm
M6 Bolt M8 Bolt
2
max. 50 mm max. 95 mm
2
2
2