Liebert 7200 Series - Connecting the UPS power cables; Cable entry; Cable rating

Chapter 3 - Insatallation Procedure 7200 Series UPS User Manual
Connecting the UPS power cables Single Module and 1+1 Parallel System
document in response to "powersure ups"
Page 3-6
Issue 6
(03/98)
3.3 Connecting the UPS power cables
WARNING
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.
NOMINAL CURRENT: Amps
Recommended Cable Size (mm
2
)
BUSBAR CONNECTION
STUD SIZE
UPS
RATING
(kVA)
Input Mains
with full battery recharge
Bypass/output
at full load
Battery
at min.
battery
voltage
Input/output
Cable
Terminations
U - V - W - N
Battery
Terminations
+ve & -ve
380V 400V 415V 380V 400V 415V
30
64
( 16 )
59
( 16 )
56
( 16 )
46
( 10 )
44
( 10 )
42
( 10 )
82
( 25 )
M6 Bolt
max. 50 mm
2
M8 Bolt
max. 95 mm
2
40
85
( 25 )
78
( 25 )
73
( 25 )
61
( 16 )
58
( 16 )
56
( 16 )
110
( 35 )
M6 Bolt
max. 50 mm
2
M8 Bolt
max. 95 mm
2
60
128
( 35 )
117
( 35 )
109
( 35 )
91
( 25 )
87
( 25 )
84
( 25 )
163
( 50 )
M6 Bolt
max. 50 mm
2
M8 Bolt
max. 95 mm
2
( NN ) mm
2
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 These recommendations are for guideline purposes only and may be superseded by local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.