DSQC377B 3HNE01586-1 ABB  analog module

Note on current carrying capacity tables and loaded conductors

Tables 8, 9 and 15 provide the current carrying capacity of loaded conductors (current carrying conductors) in normal service conditions. In single-phase circuits, the number of loaded 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.

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