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Preparing Power Cables
- You are advised to install a disconnector for the UPS input.
- A 2-pole disconnector must be used if the UPS is used to power IT systems.
- The UPS can generate large leakage currents. A circuit breaker equipped with a residual current device (RCD) is not recommended. If leakage protection is required, select a recommended circuit breaker.
- The leakage current of the 3 kVA UPS is less than 100 mA.
- When selecting an earth leakage circuit breaker, consider the leakage current of the UPS and downstream loads.
- Battery cables should not be longer than 10 m.
- For the 3 kVA model, use the battery PE cable that has a cross-sectional area of 6 mm2 and 6 mm2 M4 OT terminals.
- The UPS battery input terminal has a voltage of 56 V 10 seconds before batteries are connected.
Table 3-1 Recommended power cable specifications
Model |
Wiring Terminal |
Number of Phases |
Rated Voltage |
External Circuit Breaker |
Cable Cross-sectional Area |
Terminal Type |
Torque for Tightening Bolts |
|---|---|---|---|---|---|---|---|
3 kVA |
AC input and output |
1 |
220 V AC/230 V AC/240 V AC |
16 A (type D) |
2.5 mm2 |
OT-6 mm2-M5 terminal |
2 N·m |
Battery input |
- |
48 V DC |
63 A (type D) |
16 mm2 |
OT-16 mm2-M8 terminal |
7 N·m |
- If customers purchase input and output power cables by themselves, use the cables that comply with standards proposed by the Underwriters Laboratories (UL) or International Electrotechnical Commission (IEC).
- When selecting, connecting, and routing power cables, follow local safety regulations and rules.