Power Cables And Protective Fuses - Powerware 8 - 15 kVA User Manual

The UPS unit has the following power connections:
•
Three-phase (L1, L2, L3) and protective earth (PE) connection for the rectifier input
or
Single-phase (L1), Neutral (N) isolated connection point (bypass N is used in the rectifier)
and protective earth (PE) connection for the rectifier input.
•
Single-phase (L1), Neutral (N) and protective earth (PE) connection for the bypass input
•
Single-phase (L1), Neutral (N) and protective earth (PE) connection for the load output
•
Plus (+), minus (-) and protective earth (PE) connection for the external batteries
Note!
The rectifier requires a Neutral to operate. It's connected internally from the bypass
terminal to the rectifier, see wiring diagram.
Figure 13. Power terminals found in UPS units.

Power cables and protective fuses

Always use copper cable types to fit terminals with approximately 1.5 Nm torque for different load
currents. The Cu cable sizing is based on multi-core cables laid in conduits/trunkings on the wall or
on the floor (installation procedure C), ambient temperature 25°C, PVC insulation, surface
temperature up to 70°C. Cables of several UPS can be installed in parallel to each other.
Standards SFS 6000-5-52 (2002) and IEC 60364-5-52 (2001-08) "Electrical installations of
buildings" are used as a sizing guide. For any other conditions, size the cables according to the
local safety regulations regarding installation environment, appropriate voltage and currents of
the UPS.
Fuses are sized according to local safety regulations, appropriate input voltage and the rated
current of the UPS. Therefore, protect the input and bypass cables with gG (gL) fuses or B-C-D
type of circuit breakers against overload and short-circuit.
14
UPS 8 – 15 kVA, 230V 50/60 Hz output
User's Guide
1022403
Revision B1