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6000 : Specification guide
Parallel UPS, three-phase, 250 to 3000 kVA*
* Power rating for an N+1 redundant configuration
APC By Schneider Electric Edition - 03/2009 Spec. E - 9
5.6 - System earthing arrangement
The UPS shall be compatible with the following system earthing arrangements:
ω upstream source
…[ TT/ IT / TNS / TNC ]…
ω downstream installation
…[ TT/ IT / TNS / TNC ]…
If the upstream and downstream earthing arrangements are different, galvanic isolation shall be provided on the
static-bypass line.
6 - Mechanical characteristics
6.1 - Mechanical structure
UPSs and batteries shall be installed in cabinet(s) with a degree of protection IP20 (standard IEC 60529). Access
to the subassemblies making up the system shall be exclusively through the front.
…………………………………………………………………………………………
6.2 - Modular design
The UPS system shall be designed to allow the installed power to be easily increased on site by connection of
additional UPS units, either to meet new load requirements or to enhance system availability by introducing
redundancy.
This transformation shall be possible directly on site, without returning the equipment to the factory and without
causing excessive system downtime.
6.3 – Dimensions
The UPS shall require as little floor space as possible. To gain space, it shall be possible to install the UPS with the
back to the wall.
6.4 - Connection
To facilitate connections, all terminal blocks must be easily accessible from the front when the UPS is installed with
the back to the wall. Entry of upstream and downstream power cables, as well as any auxiliary cables, shall be
possible through the bottom for a false floor.
The UPS shall be equipped with an earth-circuit connector, in compliance with the standards listed in section 13
"Standards and tests".
The cables shall comply with the standards listed in section 12 "Standards and tests" and be mounted in
compliance with the stipulations in section 6.6 "Safety". The neutral conductor shall be oversized for any third-order
harmonic currents and their multiples (the size of the neutral shall be 1.5 times that of each phase).
6.5 - Ventilation
The UPS units shall be provided with forced-air cooling.
To facilitate positioning of UPS units (back to the wall), ventilation shall take place through the top with an air intake
on the front.
6.6 - Safety
For the safety of maintenance personnel, the cabinet shall be provided with a manually operated mechanical
bypass designed to isolate the rectifier, charger, inverter and static switch while continuing to supply the load from
the bypass AC source.
It shall be possible to send to the UPS an external EPO order resulting in opening of the battery circuit breaker and
the upstream circuit breaker.