4 distributed bypass power wiring preparation – Powerware 9395 UPS and Plus 1 UPS 650825 kVA User Manual
Page 42
UPS INSTALLATION PLAN AND UNPACKING
EATON Powerware
®
9395 UPS (650–825 kVA) Installation and Operation Manual
S 164201725 Rev 2 www.powerware.com
3−20
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The REPO switch wiring must be in accordance with NEC Article 725 Class 2
requirements.
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The maximum distance between the REPO and the UPS cannot exceed
150 meters (500 feet).
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Alarm relay contacts have a maximum current rating of 5A and a switched voltage
rating of 30 Vac and 28 Vdc.
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Alarm relay wiring should be a minimum of 22 AWG.
3.2.4
Distributed Bypass Power Wiring Preparation
Read and understand the following notes while planning and performing the
installation:
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All distributed bypass UPS rectifier inputs must come from one source and all
bypass input feeds must come from one source.
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Distributed bypass UPS input wiring size requirements and output wiring size
requirements from the UPSs to the tie cabinet or distribution panel are the same as
listed in Table 3-4 on page 3−9 and Table 3-5 on page 3−10.
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If the load requires a neutral, a bypass source neutral must be provided. If the load
does not require a neutral and there is no neutral conductor connected at the
bypass input, a neutral to ground bonding jumper must be installed. Install neutral
conductors from the UPSs to the common point of connection (tie cabinet), and
then install a system neutral to ground bonding jumper. The bonding jumper must
be copper wire. DO NOT install both a source neutral and a bonding jumper.
If the recommended system neutral bonding jumper installation method cannot be
accomplished, each UPS should have a separate neutral to ground bonding jumper
installed. See Table 3-4 or Table 3-5 for UPS neutral bonding jumper wire sizes. The
bonding jumper must be copper wire. DO NOT install both a source neutral and a
bonding jumper.
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The UPS cannot be installed in a high−resistance ground application.
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MOBs with dual auxiliary contacts are to be provided by the customer. Table 3-16
on page 3−17 lists the recommended rating for the MOBs.