Ups Electrical Installation; External Protective Devices - Liebert NXL Installation Manual

2.0 UPS E
LECTRICAL
This chapter provides guidelines for qualified installers who must have knowledge of local wiring
practices pertaining to the equipment to be installed.
WARNING
!
Risk of electrical shock. Can cause injury or death.
The UPS contains high DC as well as AC voltages. Check for voltage with both AC and DC
voltmeters before working within the UPS.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should be involved in installing the UPS or preparing the UPS for
installation.
2.1

External Protective Devices

For safety, it is necessary to install circuit breakers in the input AC supply and external battery
system. Given that every installation has its own characteristics, this section provides guidelines for
qualified installation personnel with knowledge of operating practices, regulatory standards and the
equipment to be installed.
External overcurrent protection must be provided. See Table 7 - Liebert NXL UPS specifications
for overload capacity.
Dual Input
When wiring the UPS with a separate rectifier and bypass input, each input must be protected
separately. Size the breakers according to the input currents shown in Table 7.
I
NSTALLATION
7

UPS Electrical Installation