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Installation
Guide
SG Series
10, 20, 30 & 40 kVA
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.
The AC values below are current ratings per phase.
These maximum and nominal ratings should be considered when choosing the
appropriate AC over current protection device.
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.
(See
Fig. 3.7.1-1
and
3.7.1.2
)
AC Input Rectifier
AC Input
Bypass
AC Input
DC Input
F1
F3
Nom. Max.
F2
Nom. Max.
F4
SG Series
10 kVA
17.2 A
20.2 A
12 A
17.2 A
20.2 A
19.6 A
SG Series
20 kVA
27.3 A
36.6 A
24.1 A
27.3 A
36.6 A
36 A
SG Series
30 kVA
40.4 A
53.1 A
36.1 A
40.4 A
53.1 A
55.2 A
SG Series
40 kVA
53.9 A
63.2 A
48.2 A
53.9 A
63.2 A
76 A
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
AC Input
Rectifier
AC Input
Bypass
AC Input
DC Input
F1
F2
F3
F4
SG Series
10 kVA
30 A
15 A
30 A
25 A
SG Series
20 kVA
50 A
35 A
50 A
50 A
SG Series
30 kVA
70 A
50 A
70 A
70 A
SG Series
40 kVA
80 A
70 A
80 A
100 A
