GE Industrial Solutions SG Series 750 T12 UL S2 Installation Guide - Manual (Page 26)

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OPM_SGS_ISG_M75_M75_2US_V010.doc Installation Guide SG Series 750 UL S2 & SG Series 750 T12 UL S2
3.8.3 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 nominal battery discharge current which the UPS allows.
(See Fig. 3.8.1-1 and 3.8.1.2)
AC Input
Rectifier (A)
AC Input
Bypass (A)
AC Input
(A)
DC Input
(A)*
F1 F3 F4
Nom. Max.
F2
Nom. Max. Nom. Max.
SG Series 750 (6 pulse) with 5 th filter 920 1103 902 902 1103 1512 1793
SG Series 750 (6 pulse) with 5 th & 11 th filter 900 1080 902 902 1080 1512 1793
SG Series 750 T12 (12 pulse) without filter 1082 1306 902 1082 1306 1512 1793
SG Series 750 T12 (12 pulse) with 11 th filter 1032 1245 902 1032 1245 1512 1793
*) DC over current sized to support maximum DC current.
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 (A)**
AC Input
Bypass (A)**
AC Input
(A)**
DC Input
(A)
F1 F2 F3 F4
SG Series 750 (6 pulse) with 5 th filter 1200 A 1000 A 1200 A 2000 A
SG Series 750 (6 pulse) with 5 th & 11 th filter 1200 A 1000 A 1200 A 2000 A
SG Series 750 T12 (12 pulse) without filter 1600 A 1000 A 1600 A 2000 A
SG Series 750 T12 (12 pulse) with 11 th filter 1600 A 1000 A 1600 A 2000 A
**) Assumes 100% rated Circuit Breakers. Verify size for application of 80% rated devices.
WIRING
Wire sizing according to
NEC Section 210-20 (a) Table 310-16
Use 75°C (167°F) copper wire
Wiring requirements:
AC INPUT RECTIFIER:
3-Phase, 3 wire plus Ground
AC INPUT BYPASS: 3-Phase, 4 wire plus Ground
AC OUTPUT: 3-Phase, 4 wire plus Ground
DC INPUT: 2 wire (positive and negative) plus Ground
Maximum recommended cable size
UPS rating Rectifier Input Bypass Input DC Input AC Output GND
SG Series 750
SG Series 750 T12
5 x 500 MCM 4 x 500 MCM 6 x 600 MCM 4 x 500 MCM 4 x 500 MCM