ABB TAS.580.0540G00 After sales service is provided for the control card of the power supply device

Description

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Note on current carrying capacity tables and loaded conductors
Tables 8, 9, 15 and 16 provide the current carrying capacity of loaded conductors
(current carrying conductors) under normal service conditions.
In single-phase circuits, the number of loaded conductors is two.
In balanced or slightly unbalanced three-phase circuits the number of loaded
conductors is three, since the current in the neutral conductor is negligible.
In three-phase systems with high unbalance, where the neutral conductor
in a multi-core cable carries current as a result of an unbalance in the phase
currents the temperature rise due to the neutral current is offset by the reduction
in the heat generated by one or more of the phase conductors. In this case the
conductor size shall be chosen on the basis of the highest phase current. In all
cases the neutral conductor shall have an adequate cross section.

Effect of harmonic currents on balanced three-phase
systems: reduction factors for harmonic currents in fourcore and five-core cables with four cores carrying current
Where the neutral conductor carries current without a corresponding reduction
in load of the phase conductors, the current flowing in the neutral conductor
shall be taken into account in ascertaining the current-carrying capacity of the
circuit.
This neutral current is due to the phase currents having a harmonic content
which does not cancel in the neutral. The most significant harmonic which
does not cancel in the neutral is usually the third harmonic. The magnitude of
the neutral current due to the third harmonic may exceed the magnitude of the
power frequency phase current. In such a case the neutral current will have a
significant effect on the current-carrying capacity of the cables in the circuit.