ABB CI627A Analog module industrial system controller

Description

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Danger to persons due to contact with live parts is caused by the flow of the
current through the human body. The effects are:
– tetanization: the muscles affected by the current flow involuntary contract
and letting go of gripped conductive parts is difficult. Note: very high
currents do not usually induce muscular tetanization because, when the
body touches such currents, the muscular contraction is so
sustained that the involuntary muscle movements generally throw the
subject away from the conductive part;
– breathing arrest: if the current flows through the muscles controlling the
lungs, the involuntary contraction of these muscles alters the normal
respiratory process and the subject may die due to suffocation or suffer
the consequences of traumas caused by asphyxia;
– ventricular fibrillation: the most dangerous effect is due to the
superposition of the external currents with the physiological ones which,
by generating uncontrolled contractions, induce alterations of the cardiac
cycle. This anomaly may become an irreversible phenomenon since it
persists even when the stimulus has ceased;
– burns: they are due to the heating deriving, by Joule effect, from the current
passing through the human body.
The Standard IEC 60479-1 “Effects of current on human being and livestock”
is a guide about the effects of current passing through the human body to
be used for the definition of electrical safety requirements. This Standard shows,
on a time-current diagram, four zones to which the physiological effects of
alternating current (15 ÷100 Hz) passing through the human body have been
related.