Vertiv Liebert EXM - Page 11

Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 3
Ground Leakage Currents
CAUTION
Risk of electric shock from high leakage current. Can cause injury, property damage and
death.
EARTH CONNECTION IS ESSENTIAL BEFORE CONNECTING THE INPUT SUPPLY.
Earth leakage current exceeds 3.5 mA and is less than 1000 mA.
Transient and steady-state earth leakage currents, which may occur when starting the
equipment, should be taken into account when selecting instantaneous RCCB or RCD
devices.
Residual Current Circuit Breakers (RCCBs) must be selected sensitive to DC unidirectional
pulses (Class A) and insensitive to transient current pulses.
Note also that the earth leakage currents of the load will be carried by this RCCB or RCD.
This equipment must be earthed in accordance with the local electrical code of practice.
WARNING
Risk of electric shock. Can cause injury, property damage and death.
Under typical operation and with all UPS doors closed, only normal safety precautions are
necessary. The area around the UPS 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 UPS system. Observe all safety precautions in this manual before
handling or installing the UPS system as well as during all maintenance procedures.
This equipment contains several 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 AC and DC voltmeters to ensure safety before making
contact or using tools. Even when the power is turned Off, dangerously high electric
charges may exist within the UPS.
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 qualified service personnel should perform maintenance on the UPS system. 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 (earth ground).
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 an accident should occur.