• Refer to the national and local electrical codes for acceptable external wiring
practices.
• To allow for future kVA upgrades (software and/or hardware), consider using
conductors that are sized for the full bypass rating of the UPS.
• Material and labor for external wiring requirements must be provided by
designated personnel.
• For external wiring, use copper cable rated for 70 °C at minimum. See the
appropriate information in Table
. Cable sizes are based on using the
specified breakers.
• If cables are run in an ambient temperature greater than 30 °C, higher
temperature cable and/or larger size cable may be necessary.
• The bypass feed into 93PS uses four wires. The bypass feed into 91PS uses
two wires. The rectifier feed uses three or four wires. The phases must be
symmetrical about ground (from a Wye source) for proper equipment
operation.
• The rectifier needs a neutral line from the supply that feeds the rectifier. In
91PS this neutral is connected to the bypass neutral input terminal with a
wire suitable for the bypass rating of the unit.
• A readily accessible disconnect device must be incorporated in all fixed input
wiring.
WARNING
Do not disconnect the bypass neutral without disconnecting the bypass
phases at the same time.
Table 12: Minimum recommended multi-core cable and fuse sizes for rectifier and bypass
input and UPS output cables (3-phase input, 3-phase output models)
93PS UPS rating (kW)
8
10
15
20
30
40
Cable [mm
2
]*
4*2.5
4*4
4*10
4*10
4*16
4*25
Rectifier fuse [A]
20
20
32
40
63
80
Bypass fuse [A]
20
20
32
40
63
80
PE cable [mm
2
]
1*6
1*6
1*10
1*10
1*16
1*16
Maximum conductor cross
section
20 kW frame and 20 kW C-model: solid/stranded wire 16
mm
2
, stranded wire with ferrule: 10 mm
2
40 kW frame: solid wire: 70 mm
2
, stranded wire with ferrule:
50 mm
2
* Minimum recommended
Table 13: Minimum recommended multi-core cable and fuse sizes for rectifier and bypass
input and UPS output cables (3-phase input, 1-phase output models)
91PS UPS rating (kW)
8
10
15
20
30
Rectifier cable [mm
2
]*
2,5
4
10
10
16
Eaton 91PS/93PS UPS 8–40 kW
User's and installation guide
©
Eaton Corporation plc 2018. All rights reserved.
Revision: 005
Document ID: P-164000493
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