8.2.3 External Protective Device
W A RN IN G!
H igh earth leakage current: Earth connection is critical before co nnecting the inp ut supply
(including b oth m ains supply and battery).
The equipm ent m ust be earthed in accordance w ith th e local electrical code of practice.
Refer to External Protective Device .
8.2.4 Power Cable
The power cable wiring is similar to that of the UPS module. Refer to Wiring of Power Cable
The bypass and rectifier input supplies must use the same neutral line input terminal. If the input has a current leakage
protective device, the current leakage protective device must be fitted upstream of the neutral line input terminal.
N O T E: T he pow er cables (including the bypass input cables and U PS output cab les) of each UPS
m odule should b e of the sam e len g th and sp ecifications to facilitate load sharing. Ensure the
difference is less than 10 % for load sharing.
8 Parallel System and LBS System
141
Vertiv™ Liebert® EXM2 UPS User Manual
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