Battery Over Current Protection And Wire Sizing - GE Digital Energy SG Series Installation Manual
Uninterruptible power supply 10, 20, 30 and 40 kva
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- Operating manual (88 pages) ,
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3.7.3 Battery over current protection and wire sizing
•
Please read the safety precautions at the front of this guide carefully, and thoroughly
review the battery manufacturers installation and maintenance manual before connecting
the batteries to the UPS.
•
If the UPS system has been purchased with an accompanying battery cabinet, that
cabinet should have an integral battery circuit breaker-
If the UPS has been purchased without a battery cabinet or remote rack mounted
batteries are to be used then DC over current protection must be provided by others.
•
Choose an appropriate DC fuse or circuit breaker using the current data in the chart
below.
•
Minimum battery cable requirement is based on the current data below.
These maximum and nominal ratings should be considered when choosing the
NEC (National Electric Code) Section 210-20 a rules must be applied.
DC current rating is the maximum battery discharge current which the UPS allows.
SG Series 10 kVA
SG Series 20 kVA
SG Series 30 kVA
SG Series 40 kVA
Size of Branch Circuit Over current Protection - All Models: - "CAUTION - To reduce
the risk of fire, only connect UPS to a circuit provided with (See below) maximum
amperes branch circuit over current protection in accordance
with the NEC (National Electric Code), NSI / NFPA 70
SG Series 10 kVA
SG Series 20 kVA
SG Series 30 kVA
SG Series 40 kVA
OPM_SGS_ISG_10K_40K_0US_V010.doc
The AC values below are current ratings per phase.
appropriate AC over current protection device.
(See Fig. 3.7.1-1 and 3.7.1.2)
AC Input Rectifier
F1
Nom.
Max.
17.2 A
20.2 A
27.3 A
36.6 A
40.4 A
53.1 A
53.9 A
63.2 A
AC Input
AC Input
Rectifier
Bypass
F1
30 A
50 A
70 A
80 A
21/45
AC Input
AC Input
Bypass
F2
Nom.
12 A
17.2 A
24.1 A
27.3 A
36.1 A
40.4 A
48.2 A
53.9 A
AC Input
F2
F3
15 A
30 A
35 A
50 A
50 A
70 A
70 A
80 A
Installation Guide SG Series 10, 20, 30 & 40 kVA
DC Input
F3
F4
Max.
20.2 A
19.6 A
36.6 A
36 A
53.1 A
55.2 A
63.2 A
76 A
DC Input
F4
25 A
50 A
70 A
100 A
GE
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