LEGRAND KEOR HPE UPS - Electrical Connections

Installation and start-up of KEOR HPE UPS 60÷160 kVA
Installation et démarrage de l’ASI KEOR HPE 60÷160 kVA
Installazione e avviamento KEOR HPE UPS 60÷160 kVA
OML46086 REV. C
29
4 ELECTRICAL CONNECTION
The electrical connection is part of the work which is normally provided by the company that carries
out the product installation. For this reason, the UPS manufacturer shall not be held responsible for
any damages due to wrong connections.
Use qualified personnel only
All the operations related to the electric connection must be carried out by qualified
and trained personnel.
Work in compliance with the local standards
The installation of the KEOR HPE UPS 60÷160 kVA must be carried out in
compliance with national and local regulations.
Connection of ground cable
The grounding of the UPS via the relevant terminal is mandatory. It is strongly
recommended to connect the ground terminal as first terminal.
The electrical connection is part of the work which is normally provided by the company that carries
out the electrical installation and not by the UPS manufacturer. For this reason, the following
recommendations are only an indication, as the UPS manufacturer is not responsible for the
electrical installation. In any case we recommend to carry out the installation and the electrical input
and output connections in compliance with the local standards.
Cables must be selected bearing in mind technical, financial and safety aspects. The selection and
the sizing of cables from a technical viewpoint depend on the voltage, on the current absorbed by
the UPS, on the bypass line and on the batteries, on the ambient temperature and on the voltage
drop. Finally, the kind of cable laying must be taken into particular consideration.
For more explanations regarding the selection and the sizing of cables, please refer to the relevant
IEC standards, in particular to IEC 64-8 standard.
“Short-circuit currents” (very high currents with a short duration) and “overload currents” (relatively
high currents with a long duration) are among the main causes of cable damage. The protection
systems normally used to protect the cables are: thermal magnetic circuit breakers or fuses.
Protection circuit breakers must be selected according to the maximum short-circuit current (max
Isc) that is needed to determine the breaking power of automatic circuit breakers, and to the
minimum current (min Isc) that is needed to determine the maximum length of the line protected.
The protection against short-circuit must operate on the line before any thermal and electrothermal
effects of the overcurrents may damage the cable and relevant connections.
During the electrical installation take particular care to respect the phase rotation.
The terminal boards are placed on the front of the UPS. To access the terminals remove the front
panel, removing the fixing bolts.