Installation Liebert EXL S1
37
User Manual 10H52226UM60 - Rev. 1 - 01/2017
3.2. Currents and suggested cable sizes
For external wiring requirements refer to the local regulations for the selection of the proper
conductors sizes. See Table 1 on page 38 for the max currents and max cable sizes usable in the UPS.
See chap. 9. on page 102 for the overload currents.
Connect the line power cables to UPS terminals U, V, W, N.
Connect the bypass line power cables to UPS terminals U1, V1, W1, N.
Connect the load to UPS terminals U2, V2, W2, N. (see Fig. 23 on page 46).
In case of single input feed, connect jumpers between U and U1, V and V1, W and W1.
Notice
To prevent the overheating of the UPS terminals, the temperature reached by the
selected cables must not exceed 70°C.
Notice
The voltage drop due to the external cables must not exceed 3% of the nominal
voltage.
Notice
To avoid electrical interference:
• power cables (primary input, bypass input, battery, output load cables) should be
routed separately
• communication and data lines should be routed using proper conduits and kept
separate from all power cables.
Notice
The cross section of the ground cables must be selected in accordance with
national and local rules, and coordinated with protection devices installed ahead
of the UPS.
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