Liebert Ship-Ahead Input/Output Cabinet NXL - Manual (Page 8)

Electrical Installation
4
2.0 E
LECTRICAL
I
NSTALLATION
This chapter provides guidelines for qualified installers who must have knowledge of local wiring
practices pertaining to the equipment to be installed.
2.1 External Protective Devices
For safety, circuit breakers must be installed 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 equip-
ment to be installed.
External overcurrent protection must be provided. See Tables 1 through 4 for overload capacity.
Dual Input
When wiring the cabinet with a separate rectifier and bypass input, each input must be protected sep-
arately.
Size the breakers according to the input currents shown in Tables 1 and 2.
2.2 Power Cables
The UPS will require both power and control cabling. All control cables, whether shielded or not,
should be run separate from the power cables in metal conduits or metal ducts which are electrically
bonded to the metalwork of the cabinets to which they are connected
The cable design must comply with the voltages and currents in Tables 1 through 4, follow local wir-
ing practices and take into consideration the environmental conditions (temperature and physical
support equipment and methods), room temperature and conditions of installation of the cable and
system’s overload capacity.
For cable entry terminal, refer to Figure 1.
NOTICE
For dual input operation, ensure that any busbars between the bypass and the rectifier input
are removed.
When sizing battery cables, a maximum volt drop of 2VDC is permissible at the current ratings given
in Table 4.
!
WARNING
Risk of electrical shock. Can cause injury or death.
Check for voltage with both AC and DC voltmeters before working within the cabinet.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should be involved in installing the cabinet or preparing the cabinet for
installation.
!
WARNING
Risk of electrical shock. Can cause injury or death.
Before cabling the UPS, ensure that you are aware of the location and operation of the
external isolators that connect the input/bypass supply to the power distribution panel.
Check that these supplies are electrically isolated, and post any necessary warning signs to
prevent their inadvertent operation.