ABB TC630 After sales service is provided for the control card of the power supply device

Description

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IT system:
The Standard advises against distributing the neutral conductor in IT systems.
If the neutral conductor is distributed, the overcurrents must be detected on the
neutral conductor of each circuit in order to disconnect all the live conductors
on the corresponding circuit, including the neutral one (neutral conductor
protected and disconnected).
Overcurrents do not need to be detected on the neutral conductor in any of
the following cases:
• the neutral conductor is protected against short-circuit by a protective device
fitted upstream;
• the circuit is protected by a residual current device with rated residual current
lower than 0.15 times the current carrying capacity of the corresponding
neutral conductor. This device must disconnect all the live conductors, the
neutral conductor included.
For all distribution systems, whenever necessary, connection and disconnection
of the neutral conductor, shall ensure that:
• the neutral conductor is not disconnected before the phase conductor;
• the neutral conductor is connected at the same moment or before the phase
conductor.

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 1.2.1 “Current carrying capacity and methods of installation”