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This manual contains important instructions that should be followed during installation of your 

Liebert NXL

™

 Maintenance Bypass Cabinet.

Read this manual thoroughly before working with the maintenance bypass cabinet. Retain this man-

ual for use by installing personnel.

Exercise extreme care when handling cabinets to avoid equipment damage or injury to 

personnel. The Liebert NXL Maintenance Bypass Cabinet weight ranges from 700 to 900 lb 

(317 to 409kg).
Locate center of gravity symbols

 and determine unit weight before handling each 

cabinet. Test lift and balance the cabinets before transporting. Maintain minimum tilt from 

vertical at all times.
Slots at the base of the cabinets are intended for forklift use. Base slots will support the unit 

only if the forks are completely beneath the unit.
In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or 

those approved for use in fighting electrical fires.
Extreme caution is required when performing maintenance.
Be constantly aware that the system contains high DC as well as AC voltages.
Check for voltage with both AC and DC voltmeters prior to making contact.

Under typical operation and with all doors closed, only normal safety precautions are 

necessary. The area around the system should be kept free of puddles of water, excess 

moisture and debris.
Special safety precautions are required for procedures involving handling, installation and 

maintenance of the Maintenance Bypass Cabinet. Observe all safety precautions in this 

manual before handling or installing the Maintenance Bypass Cabinet. Observe all 

precautions in the Operation and Maintenance Manual, before as well as during performance 

of all maintenance procedures.
This equipment contains circuits that are energized with high voltage. Only test equipment 

designed for troubleshooting should be used. This is particularly true for oscilloscopes. Always 

check with an AC and DC voltmeter to ensure safety before making contact or using tools. 

Even when the power is turned Off, dangerously high potential electric charges may exist.
All power and control wiring should be installed by a qualified electrician. All power and 

control wiring must comply with the NEC and applicable local codes.
ONLY properly trained and qualified personnel should perform maintenance on the Maintenance 

Bypass Cabinet. When performing maintenance with any part of the equipment under power, 

service personnel and test equipment should be standing on rubber mats. The service personnel 

should wear insulating shoes for isolation from direct contact with the floor ground.
One person should never work alone, even if all power is removed from the equipment. A 

second person should be standing by to assist and summon help in case of an accident.

This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J 

of the FCC rules. These limits provide reasonable protection against harmful interference in a 

commercial environment. This unit generates, uses and radiates radio frequency energy and, 

if not installed and used in accordance with this instruction manual, may cause harmful 

interference to radio communications. Operation of this unit in a residential area may cause 

harmful interference that the user must correct at his own expense.

NOTE
Liebert Corporation neither recommends nor knowingly sells this product for use with life