Emerson 480VAC Fascicule

© 2008 Liebert Corporation

All rights reserved throughout the world. Specifications subject to change without notice.
® Liebert is a registered trademark of Liebert Corporation. 

All names referred to are trademarks or registered trademarks of their respective owners.

SL-25218_REV0_03-08

800-222-5877 (Outside U.S. 614-841-6755)
upstech@emersonnetworkpower.com
Web site: www.liebert.com

1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229

40

36

480

480

48

66.8

90

480

98

48

70

23.6 x 38.2 x 78.7

(600 x 970 x 2000)

1290 (585)

11,612 (3.4)

620 (1050)

60

54

480

480

72

100.2

125

480

146

72

110

1290 (585)

15,204 (4.5)

620 (1050)

80

72

480

480

96

133.6

175

480

195

96

150

1290 (585)

20,273 (5.9)

620 (1050)

100

90

480

480

120

167.1

225

480

244

120

175

1422 (645)

23,496 (6.9)

920 (1550)

120

108

480

480

144

200.5

250

480

293

144

225

1422 (645)

28,196 (8.3)

920 (1550)

See Notes for Table (below):

1

2,3,5,8,12

6

4

1,3,8,12

1,3,8,12

6

13

14

—

—

1. Nominal (Nom) current is based on full rated output load at nominal input 

voltage.

2. Maximum (Max) current (140% of nominal) is short duration for battery 

recharge conditions and low input voltage.

3. UPS input and bypass cables must be run in separate conduit from output 

cables.

4. Nominal battery voltage is shown at 2.0 volts/cell per NEC 480-2.
5. For Single Input units only. 

For Dual Input units, see “Electrical Data Specification Sheet, 40-120kVA 

UPS Module, Single or Dual Input Liebert NX - U3819100.”

6. OCPD = Overcurrent Protection Device. Recommended AC input and AC 

output overcurrent protection represents 125% of nominal full load current 

(continuous) plus 100% of recharge current (non-continuous) per NEC 215.

7. Minimum-sized grounding conductors to be per NEC 250-122. Parity-sized 

ground conductors are recommended. Neutral conductors to be sized for full 

capacity per NEC 310-15 (b)(4). References are per NEC 1999.

8. Wiring requirements:

9. All wiring is to be in accordance with national and local electric codes.
10. Minimum access clearance is 3 ft. (0.9m) front and 8 in. (203mm) above 

the UPS.

Notes for Table (continued)

11. Top or bottom cable entry through removable access plates. Punch plate to 

suit conduit size, then replace.

12. Control wiring and power wiring must be run in separate conduit. 
13. Dimensions and weights in table do not include external battery cabinet.

• Input and output wiring and breakers for a Liebert NX with Softscale technol-

ogy should be sized for the maximum scalable capacity. For example, a 40kVA 

Liebert NX that is scalable to 80kVA should be installed with wiring and 

breakers rated for an 80kVA configuration.

• If site configuration includes a backup emergency generator, it is recom-

mended that the engine generator set be properly sized and equipped for a 

UPS application. Generator options would typically include an isochronous 

governor (generator frequency regulation) and a UPS-compatible regulator 

(generator voltage regulation). Consult generator manufacturer for required 

generator options and sizing.

• If site configuration includes an automatic transfer switch, refer to Liebert 

Power Line titled “Criteria for Application of Automatic Transfer Switches 

(ATS) With Uninterruptible Power Supply (UPS) Systems,” publication 

91K-PLT-48-02. It is also recommended that the transfer switch be equipped 

with auxiliary contacts for UPS “on generator” current limit. Consult transfer 

switch manufacturer for required transfer switch options and sizing.

• If site configuration requires an external isolated maintenance bypass circuit, 

it should be noted that utility AC input might not be in phase with the UPS AC 

output. Consult a Liebert sales representative or applications engineer.

AC Input:

3-phase, 3-wire, plus ground

AC Output: 3-phase, 3-wire, plus ground