This International Standard is a basic safety publication
primarily intended for use by technical committees in the
preparation of standards in accordance with the principles laid
down in IEC Guide 104 and ISO/IEC Guide 51.
It is not intended to be used as a stand-alone standard.
According to IEC Guide 104, technical committees, when
preparing, amending, or revising their publications, are required
to make use of any basic safety publication such as IEC 61140.
This International Standard applies to the protection of persons
and livestock against electric shock. The intent is to give
fundamental principles and requirements which are common to
electrical installations, systems and equipment or necessary for
their coordination, without limitations with regard to the
magnitude of the voltage or current, or the type of current, and
for frequencies up to 1 000 Hz.
Some clauses in this standard refer to low-voltage and
high-voltage systems, installations and equipment. For the purposes
of this standard, low-voltage is any rated voltage up to and
including 1 000 V a.c. or 1 500 V d.c.. High voltage is any rated
voltage exceeding 1 000 V a.c. or 1 500 V d.c..
It should be noted that, for an efficient design and selection
of protective measures, the type of voltage that may occur and its
waveform needs to be considered, i.e. a.c. or d.c. voltage,
sinusoidal, transient, phase controlled, superimposed d.c., as well
as a possible mixture of these forms. The installations or
equipment may influence the waveform of the voltage, e.g. by
inverters or converters. The currents flowing under normal
operating conditions and under fault conditions depend on the
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