IEC 60038:2009 pdf IEC standard voltages

IEC 60038:2009 pdf IEC standard voltages
1 Scope
This publication applies to
– a.c. transmission, distribution and utilization systems and equipment for use in such systems
with standard frequencies 50 Hz and 60 Hz having a nominal voltage above 1 00 V;
– a.c. and d.c. traction systems;
– a.c. and d.c. equipment having nominal voltages below 1 20 V a.c. or below 750 V d.c.,
the a.c. voltages being intended (but not exclusively) for 50 Hz and 60 Hz applications;
such equipment covers batteries (from primary or secondary cells), other power supply
devices (a.c. or d.c.), electrical equipment (including industrial and communication),
and appliances.
This publication does not apply to voltages representing or transmitting signals or measured
values.
This publication does not apply to standard voltages of components and parts used within
electrical devices or items of equipment.
This publication specifies standard voltage values which are intended to serve
− as preferential values for the nominal voltage of electrical supply systems, and
− as reference values for equipment and system design.
NOTE 1 Two main reasons have led to the values specified in this standard:
The values of nominal voltage (or highest voltage for equipment) specified in this standard are mainly based on the
historical development of electrical supply systems throughout the world, since these values turned out to be the
most common ones, and have achieved worldwide recognition;
The voltage ranges mentioned in this standard have been recognized to be the most appropriate ones as a basis
for design and testing of electrical equipment and systems.
NOTE 2 It is nevertheless the task of system and product standards to define appropriate testing values, testing
conditions and acceptance criteria.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60364-5-52: Electrical installations of buildings – Part 5-52: Selection and erection of
electrical equipment – Wiring systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
For alternating voltages, the voltages stated below are r.m.s. values.
3.1 nominal system voltage
a suitable approximate value of voltage used to designate or identify a system
[IEV 601 -01 -21 , modified]
3.2 highest voltage of a system
(excluding transient or abnormal conditions)
the highest value of operating voltage which occurs under normal operating conditions at any
time and at any point on the system
NOTE It excludes transient overvoltages, such as those due to switching operations, and temporary variations of voltage.
[IEV 601 -01 -23, modified]
3.3 lowest voltage of a system
(excluding transient or abnormal conditions)
the lowest value of operating voltage which occurs under normal operating conditions at any
time and at any point on the system
NOTE It excludes transient voltages, such as those due to switching operations, and temporary variations of voltage.
[IEV 601 -01 -24, modified]
3.4 supply terminals
point in a transmission or distribution network designated as such and contractually fixed, at
which electrical energy is exchanged between contractual partners
3.5 supply voltage
the phase-to-phase or phase-to-neutral voltage at the supply terminals
NOTE An equivalent definition is: the line-to-line or line-to-neutral voltage at the supply terminals.
3.6 supply voltage range
the voltage range at the supply terminals
3.7 utilization voltage
the phase-to-phase or phase-to-neutral voltage at the outlets or at the points where
utilisation equipment is intended to be connected to the fixed installation
NOTE An equivalent definition is: the line-to-line or line-to-neutral voltage at the outlets or at the points where utilisation equipment is intended to be connected to the fixed installation.
3.8 utilization voltage range
the voltage range at the outlets or at the points where utilisation equipment is intended to be
connected to the fixed installation
NOTE Attention is drawn to the fact that in some equipment standards (for example, IEC 60335-1 and IEC 60071 ), the term “voltage range” has a different meaning.