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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 is the base of the
cabinet. As shown in figure 3-2 separate entry position 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.
Notes:
1. The neutral conductor should be sized 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. Cable 4 dia. 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may be superseded by local regulations and codes of practice.
UPS
Rating
(kVA)
64
(16)
85
(25)
128
(35)
Nominal Current (Amps)
Recommended Cable Size (mm²)
Busbar Connection
Stud size
Input Mains
with full battery recharge
Bypass / Output
at full load
Battery
at min. battery voltage
380V
400V
415V
380V
400V
415V
Input/ Output
Cable Terminations
U – V – W - N
Battery
Terminations
+ve & -ve
30
40
60
59
(16)
78
(25)
117
(35)
56
(16)
73
(25)
109
(35)
46
(10)
61
(16)
91
(25)
44
(10)
58
(16)
87
(25)
42
(10)
56
(16)
84
(25)
82
(25)
110
(35)
163
(50)
M6 Bolt
max. 50mm²
M6 Bolt
max. 50mm²
M6 Bolt
max. 50mm²
M8 Bolt
max 95mm²
M8 Bolt
max 95mm²
M8 Bolt
max 95mm²
7400M - Series UPS User Manual
Single Module and 1+N Parallel System
