5SHY55L4500 ABB Silicon controlled module IGCT high voltage control spare parts

Description

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Determination of the minimum cross section of the neutral conductor
The neutral conductor, if any, shall have the same cross section as the line
conductor:
• in single-phase, two-wire circuits whatever the section;
• in polyphase and single-phase three-wire circuits, when the size of the line
conductors is less than or equal to 16 mm2 in copper, or 25 mm2 in
aluminium.1
The cross section of the neutral conductor can be less than the cross section
of the phase conductor when the cross section of the phase conductor is
greater than 16 mm2 with a copper cable, or 25 mm2 with an aluminium cable,
if both the following conditions are met:
• the cross section of the neutral conductor is at least 16 mm2 for copper
conductors and 25 mm2 for aluminium conductors;
• there is no high harmonic distortion of the load current. If there is high harmonic
distortion (the harmonic content is greater than 10%), as for example in
equipment with discharge lamps, the cross section of the neutral conductor
cannot be less than the cross section of the phase conductors.
Table 1: Minimum cross sections of the neutral conductor
Phase cross section Min. neutral cross section
S [mm2] SN [mm2]
Single-phase/two-phase circuits
Cu/Al Any S*
Three-phase circuits S ≤ 16 S*
Cu S > 16 16
Three-phase circuits S ≤ 25 S*
Al S > 25 25
*for TN-C systems, the Standards specify a minimum cross section of 10 mm2 for
copper and 16 mm2 for aluminium conductors
1 The cross section of phase conductors shall be dimensioned in compliance with the
instructions of the Chapter 2.2.1 “Current carrying capacity and methods of installation”