Single-Module Mechanical Installation
2
1.0 SINGLE-MODULE MECHANICAL INSTALLATION
1.1 Introduction
This section describes the requirements that must be taken into account when planning the position-
ing and cabling of the Liebert NXL Maintenance Bypass Cabinet.
This chapter is a guide to general procedures and practices that should be observed by the installing
engineer. The particular conditions of each site will determine the applicability of such procedures.
NOTICE
Three-phase input supply required.
The standard Liebert NXL UPS is suitable for connection to three-phase, four-wire (+ Earth)
TN-C, TN-S, IT-G, IT-IG or three-phase, three-wire plus ground, IT-UG.
If using the Liebert NXL UPS with an IT Power system, a four-pole disconnect device must be
included as part of building installation.
1.2 Preliminary Checks
Before installing the Maintenance Bypass Cabinet, carry out the following preliminary checks:
• Visually examine the equipment for transit damage, both internally and externally. Report any
damage to the shipper immediately.
• Verify that the correct equipment is being installed. The equipment supplied has an identification
tag on the back of the main door reporting: the type, size and main calibration parameters of the
UPS.
• Verify that the room satisfies the environmental conditions stipulated in the equipment specifica-
tions, paying particular attention to the ambient temperature and air exchange system.
1.3 Environmental Considerations
1.3.1 Room
The Maintenance Bypass Cabinet is intended for indoor installation and should be located in a cool,
dry, clean-air environment with adequate ventilation to keep the ambient temperature within the
specified operating range (see 3.0 - Specifications).
All models of the Liebert NXL Maintenance Bypass Cabinet are convection-cooled. To permit air to
enter and exit and prevent overheating or malfunctioning, do not cover the ventilation openings.
When bottom entry is used, the conduit plate can be removed and punched and replaced. The bottom
conduit plate must be replaced for proper airflow. If necessary to cool the room, install a system of
room extractor fans.
!
WARNING
Do not apply electrical power to the UPS equipment before the arrival of the commissioning
engineer.
!
WARNING
The Maintenance Bypass Cabinet should be installed by a qualified engineer in accordance
with the information contained in this chapter and all equipment not referred to this manual
is shipped with details of its own mechanical and electrical installation.
!
WARNING
Eye protection should be worn to prevent injury from accidental electrical arcs. Remove rings,
watches and all metal objects. Only use tools with insulated handles. Wear rubber gloves.
NOTE
The Maintenance Bypass Cabinet is suitable for mounting on concrete or other non-
combustible surface only.
