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PM864A PM864AK01 3BSE018161R1 ABB Processor programmable control module
PM864A PM864AK01 3BSE018161R1 ABB Processor programmable control module
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It is assumed that the risk of a double earth fault in which the first fault is
downstream of the breaker on one polarity and the second is upstream of the
same switching device on the opposite polarity is null.
In this condition the fault current, which can reach high values, effects only
some of the 4 poles necessary to ensure the breaking capacity.
It is possible to prevent the possibility of a double earth fault by installing a
device which signals the loss of insulation and identifies the position of the first
earth fault, allowing it to be eliminated quickly.
Networks with one polarity connected to earth
As the polarity connected to earth does not have to be interrupted (in the example
it is assumed that the polarity connected to earth is negative, although the
following is also valid with the polarity inverted), the diagram which shows the
connection of 4 poles in series on the polarity not connected to earth may be
used.
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