ABB CI801 3BSE022366R1 Analog module industrial system controller

Description

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The earth fault modalities and the consequences caused by contact with live
parts, are strictly related to the neutral conductor arrangement and to the
connections of the exposed conductive parts.
For a correct choice of the protective device, it is necessary to know which is
the distribution system of the plant.
IEC 60364-1 classifies the distribution systems with two letters.
The first letter represents the relationship of the power system to earth:
– T: direct connection of one point to earth, in alternating current systems,
generally the neutral point;
– I: all live parts isolated from earth, or one point, in alternating current systems,
generally the neutral point, connected to earth through an impedance.
The second letter represents the relationship of the exposed conductive parts
of the installation to earth:
– T: direct electrical connection of the exposed conductive parts to earth;
– N: direct electrical connection of the exposed conductive parts to the earthed
point of the power system.
Subsequent letters, if any, represent the arrangement of neutral and protective
conductors:
– S: protective function is provided by a conductor separate from the neutral
conductor;
– C: neutral and protective functions combined as a single conductor (PEN
conductor).