Power Cables And Protective Fuses - Eaton Powerware 9155 UPS20-30kVA User Manual

The UPS unit has the following power connections:
•
Three-phase (L1, L2, L3), Neutral (N) and protective earth (PE) connection for the rectifier
input (Note: N is only an open tie point)
•
Single-phase (L1), Neutral (N) and protective earth (PE) connection for the bypass input (N
is common for rectifier and bypass inputs)
•
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.
Note!
Care needs to be taken to ensure that the input supply neutral reference is not
disconnected whilst the UPS is in service.
Power cables and protective fuses
Always use copper cable types to fit terminals with approx. 1. 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 2°C, PVC insulation,
surface temperature up to 70°C. Cables of several UPS can be installed in parallel to each other.
Standards SFS 6000--2 (2002) and IEC 60364--2 (2001-08) "Electrical installations of
buildings" with normal 1.7 x Neutral conductor rating for IT loads 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.
Contact the manufacturer's authorised agent or the local office for assistance at fuse and cable
sizing. Refer to the recommended cable and fuse ratings in the below table.
UPS rating Input
Fusing Cable
20 kVA 3x35 A 4x10 mm² 100 A
30 kVA 3x50 A 4x10 mm² 160 A
Maximum 4x35 mm²
Table 2 Minimum Cable and fuse ratings for the different UPS ratings with installation procedure C
1026743
Revision B
Bypass Load
Fusing Cable/L1-N Cable/L1-N I nom
35 mm² 35 mm²
70 mm² 70 mm²
95 mm² 95 mm²
UPS 20-30 kVA, 230 V 0/60 Hz output
User's Guide
PE Battery
Cable Cable
87,0 A 16 mm² 16 mm²
130,4 A 35 mm² 16 mm²
35 mm² 35 mm²
Fusing
2x125 A
2x125 A
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