Electrical Installation
Eaton 9355 UPS (20/30kVA) Installation and Operation Manual 164201626—Rev F
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35
Wiring Specifications and Diagrams
Note:
Input neutral must be wired for proper operation or the UPS will not start. If you have an Options
Cabinet with an input isolation transformer, the input neutral is supplied by the input isolation
transformer.
Note:
The Eaton 9355 UPS is shipped as a single-feed UPS and can be converted to a dual-feed UPS in the
field.
Note:
DO NOT overtighten the screws; be sure to use the specified tightening torque values shown in
Table 1.
Table 1. Terminal Block Wiring
20 kVA
System Voltage
Wire
Function
Feeder Circuit
Breaker Rating
L1, L2, L3, N
Wire Size
1
Ground
Wire Size
1
Tightening
Torque
Conduit Size
2, 3
(Number of Conduits)
208
Input
UPS X1
WYE / 4-wire
100A
1 AWG
6 AWG
120 lb in
(13.5 Nm)
2.00" conduit (1)
220
100A
1 AWG
6 AWG
480
Input
Options Cabinet
Delta / 3-Wire
45A
6 AWG
10 AWG
1.00" conduit (1)
600
35A
8 AWG
10 AWG
208
Output
UPS X2
WYE / 4-wire
1 AWG
6 AWG
120 lb in
(13.5 Nm)
2.00" conduit (1)
220
1 AWG
6 AWG
480
Output
Options Cabinet
WYE / 4-Wire
6 AWG
10 AWG
1.00" conduit (1)
30 kVA
System Voltage
Wire
Function
Feeder Circuit
Breaker Rating
L1, L2, L3, N
Wire Size
1
Ground
Wire Size
1
Tightening
Torque
Conduit Size
2, 3
(Number of Conduits)
208
Input
UPS X1
WYE / 4-wire
125A
1/0 AWG
6 AWG
120 lb in
(13.5 Nm)
2.00" conduit (1)
220
125A
1/0 AWG
6 AWG
480
Input
Options Cabinet
Delta / 3-Wire
60A
6 AWG
10 AWG
1.00" conduit (1)
600
50A
6 AWG
10 AWG
208
Output
UPS X2
WYE / 4-wire
1/0 AWG
6 AWG
120 lb in
(13.5 Nm)
2.00" conduit (1)
220
1/0 AWG
6 AWG
480
Output
Options Cabinet
WYE / 4-Wire
6 AWG
10 AWG
1.00" conduit (1)
1
Use only 90°C-rated copper wire. Minimum wire size is based on 120/208 full load ratings applied to National Electrical Code
®
(NEC
®
)
Table 310-104A. Code may
require a larger AWG size than shown in this table because of temperature, number of conductors in the conduit, or long service runs. Follow local requirements.
2
Per NEC article 300-20(a) for Ferrous Metal Raceways, all three-phase conductors must be run in the same conduit. Neutral and ground must be run in the same
conduit as the phase conductors.
3
Conduit is sized to accommodate one neutral conductor the same size as the phase conductor and one ground conductor. If two neutral conductors or an oversized
neutral conductor are to be installed, check the size of the conduit needed to accommodate the extra wire or size and use that conduit size in place of the conduit
size listed. Conduit sizes were chosen from NEC Table C1, type letters RHH, RHW, RHW-2, TW, THW, THHW, THW-2.
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