Battery Over Current Protection And Wire Sizing - GE Digital Energy SG Series Installation Manual
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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 appropriate AC
NEC (National Electric Code) Section 210-20 a rules must be applied.
DC current rating is the nominal battery discharge current which the UPS allows.
UPS rating
SG Series 50 kVA
SG Series 80 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
UPS rating
SG Series 50 kVA
SG Series 80 kVA
Refer to torque specifications table for torque requirements
UPS rating
SG Series 50 kVA
SG Series 80 kVA
Modifications reserved
OPM_SGS_ISG_50K_80K_0US_V040.doc
The AC values below are current ratings per phase.
over current protection device.
(See Fig. 3.7.1-1 and 3.7.1.2)
AC Input Rectifier
F1
Nom.
Max.
65.5 A
81 A
104.7 A
125 A
AC Input Rectifier
F1
110
175
WIRING
Wire sizing according to
NEC Section 210-20 (a)
Use 75°C (167°F) copper wire
Wiring requirements:
AC INPUT RECTIFIER:
AC INPUT BYPASS:
AC OUTPUT:
DC INPUT:
Maximum cable diameter that terminals can accept
Rectifier Input
Bypass Input
4/0 AWG
4/0 AWG
4/0 AWG
4/0 AWG
AC Input
Bypass
F2
Nom.
60.1 A
65.5 A
96.2 A
104.7 A
AC Input Bypass
F2
80
125
Table 310-16
3-Phase, 3 wire plus Ground
3-Phase, 4 wire plus Ground
3-Phase, 4 wire plus Ground
2 wire (positive and negative) plus Ground
DC Input
4/0 AWG
4/0 AWG
AC Input
DC Input
F3
Max.
81 A
125 A
AC Input
DC Input
F3
F4
110
110
175
200
AC Output
4/0 AWG
4/0 AWG
4/0 AWG
4/0 AWG
Installation Guide SG Series 50 & 80 kVA
F4
100 A
159 A
GND
Page 20/38
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