Emerson Liebert NXL User Manual

UPS Electrical Installation
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2.6.3 Preferred Grounding Configuration, Battery Systems
Open-rack battery systems, depending on local code requirements and customer preference, are
normally:
• Floating (ungrounded)
OR
• Center-tapped and floating
Battery cabinet systems must be connected as floating (ungrounded) systems.
Center-tapped or grounded battery systems are not possible with battery cabinet systems.
Whether the battery system is open-rack or cabinet, the metal rack parts or cabinet must be grounded
to the UPS module ground bus.
2.6.4 Multi-Module Systems
For both N+1 and 1+N systems, the neutrals of all UPS modules in the system must be connected
together inside the switchgear or parallel cabinet. The neutral conductors must be rated for 20% of
phase conductor current minimum. Site and load conditions will determine if larger neutrals are
required.
For Multi-Module systems using a 3-wire bypass, the Neutral-Ground bond must be made at the
common neutral connection point in the switchgear or parallel cabinet.
2.6.5 High-Resistance Ground Systems
The Liebert NXL is compatible with high-resistance ground systems. See your local Emerson
representative for details.

Emerson Liebert NXL Specifications

General

Brand	Emerson
Model	Liebert NXL
Category	UPS
Language	English