GE Industrial Solutions SG Series 400 & 500 Installation Guide - Manual (Page 25)

NOTE !
This UPS is only designed to operate in a wye-configured electrical system with a
solidly grounded neutral.
The UPS cannot be operated from a mid-point or end-point grounded delta supply
source.
If the Load requires a Neutral, a Bypass Source Neutral MUST BE PROVIDED.
If no Neutral Connection is available with the Bypass Input (3-wire input + ground) and the Load does
not require a Neutral, solidly connect the Output Neutral of the UPS to ground with a ground
bonding jumper.
For single module applications install the ground bonding jumper directly at the UPS output.
Cable size for this connection shall be per National Electric Code and applicable local regulations,
but not less than AWG 3/0.
Attention: With this configuration, Load can only be connected phase-phase.
Absolutely no Load Connection permitted to the Neutral of the output transformer.
DO NOT install both a source Neutral and a bonding jumper!
In a RPA Parallel System configuration it is most
important to connect the Neutrals of the UPS
outputs together.
The output distribution cabinet must contain a
Neutral Bus (see Fig .3.8.2-2).
If no Neutral Connection is available with the
Bypass Input (3-wire input + ground) and the Load
does not require a Neutral, solidly connect the
Output Neutral of the UPS to ground in the Output
Distribution Cabinet.
Wire Neutral Conductors from the UPS to the
output distribution cabinet (common point of
connection) and solidly connect to ground with a
ground bonding jumper.
Fig. 3.8.2-2 RPA Parallel System
Cable size for the ground bonding jumper shall be per National Electric Code and applicable local
regulations, but not less than AWG 3/0.
Attention: DO NOT INSTALL both a source Neutral and a bonding jumper.
If the UPS is equipped with an Input Bypass Transformer, the Secondary of the transformer must be
wye-configured with Neutral Solidly Grounded.
The Neutral of the Output Transformer must be connected to the wye secondary winding of the
Bypass Transformer.
eBoost™ Operation Mode
For installations intended to be operated in eBoost™ Operation Mode, the Input Neutral Conductor
must be connected from the source of supply.
An Input Neutral Conductor MUST be pulled into the UPS.
Neutral to ground bonding jumper shall NOT be installed in UPS installations intended to be
operated in eBoost™ Operation Mode.
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OPM_SGS_ISG_M40_M50_2US_V021.doc User Manual SG Series 400 & 500 UL S2