5
For three-phase equipment connection to an IT power system,
a four-pole device which disconnects all phase conductors and
the neutral conductor should be provided in the building wiring
installation.
This is permanently connected equipment, it must be installed
by qualified maintenance personnel.
For permanently connected equipment: make sure that a
readily accessible disconnect device is incorporated in the
building installation wiring.
To reduce the risk of fire, connect only to a circuit provided with
branch circuit overcurrent protection with an ampere rating in
accordance with the IEC/EN 60934 standard or your local
electrical code and have a contact air gap of at least 3 mm.
Earthing connection is essential before connecting to the
building wiring terminal.
2.2 Operation
Do not disconnect the earth conductor cable from the UPS or
the building wiring terminals at any time since this will affect the
protective earth of the UPS system and of all connected loads.
The UPS output terminal block may be electrically active even
if the UPS system is not connected to the building wiring
terminal.
In order to fully disconnect the UPS, firstly press the OFF
button, and then disconnect the mains lead.