Cross-Sections - Siemens SIVACON 8PS Configuration Manual

Product description

3.7 Cross-sections

3.7 Cross-sections
Important properties of the N and PE conductor cross-sections/clean earth
Neutral conductor cross-section
The growth in the number of new electronic and noise-sensitive loads, especially in the area
of energy supply in buildings, presents new challenges to busbar trunking systems.
Disturbance variables such as electromagnetic fields and system harmonics influence the
functional capability of computers, servers and other electronic devices. The large number of
these AC loads within a network places a high load on the neutral conductor through
harmonics. Double neutral conductor cross-sections (200%) reduce the plant's susceptibility
to interference in networks subject to harmonics.
PE conductor cross-section
A high cross-section of the PE conductor also offers safety for the energy supply. It
guarantees early shutdown of small short-circuit currents thanks to low loop impedances.
This reduces the risk of potential downtimes resulting from fast shutdown of the upstream
protective elements.
Clean earth
Isolated PE conductors are fully galvanically isolated from the trunking enclosure. In this
way, the conductors make a crucial contribution to the reliability and safety of the energy
supply for electronic loads in buildings. In the case of a short-circuit between phase and load
enclosure, this PE conductor (clean earth) remains unaffected by this fault. This means it is
non-isolated in the event of a short-circuit to frame Even the fault currents in the enclosure
generated by magnetic fields do not affect the clean earth. This means the clean earth is
optimally suited to PE connection of sensitive electronic loads.
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SIVACON 8PS - Configuring with LX system
Configuration Manual, 10/2011, A5E02194899-02