Siemens SENTRON - Page 64

64
Appendix
A
Exposed conductive part (of electrical equipment)
Touchable, conductive part of the electrical equipment that is not normally live
but that may be live in the event of a fault.
Electric shock
Pathophysiological effect caused by an electric current owing through the body
of a person or animal.
Additional protection
Supplementary measure to reduce the risks that may arise to persons and livestock
if the basic and/or fault protection is rendered ineffective.
Basic protection
Protection against electric shock in a non-faulty system. Basic protection
usually corresponds to the protection against direct contact described in
DIN VDE 0100-410.
Fault protection
Protection against electric shock if a single fault occurs (e.g. faulty basic
insulation).
Fault protection usually corresponds to the protection against indirect contact
described in DIN VDE 0100-410.
Dangerous body current
Current owing through the body of a person or animal with characteristics that
are likely to trigger a pathophysiological (harmful) effect.
Leakage current (in an installation)
Current owing in a non-faulty circuit to ground or to an external conductive part.
Residual current
Sum of the instantaneous values of all currents owing through all active con-
ductors in a circuit at a dened point in the electrical system.
In connection with residual current protective devices, the differential current
is referred to as “residual current” in accordance with the standards in the
DIN VDE 0664 (VDE 0664) series.
Operational current
Current that should ow in the circuit during normal operation.