IEC 60038-2009 pdf free download – CENELEC standard voltages (IEC 60038:2009, modified).
This publication applies to
a.c. transmission, distribution and utilization systems and equipment for use in such systems witha standard frequency of 50 Hz having a nominal voltage above 100 v;
– a.c. and d.c. traction systems;
a.c. and d.c. equipment having nominal voltages below 120 V a.c. or below 750 V d.c., the a.c.voltages being intended (but not exclusively) for 50 Hz applications; such equipment coversbatteries (from primary or secondary cells), other power supply devices (a.c. or d.c.), electricalequipment (including industrial and communication), and appliances.
NOTE Z1 Only standard frequency 50 Hz is used in Europe for public a.c. transmission and distribution systems.Forsystems and equipment at 6o Hz, see lEC 60038.
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 electricaldevices 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 thehistorical development of electrical supply systems throughout the world, since these values turned out to be the mostcommon 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 fordesign and testing of electrical equipment and systems.
NOTE 2 lt is nevertheless the task of system and product standards to define appropriate testing values，testingconditions and acceptance criteria.
2Normative references
The following referenced documents are indispensable for the application of this document.Fordated references, only the edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.
HD 60364-5-52,Low voltage electrical installations – Part 5-52:Selection and erection of electricalequipment – Wiring systems (IEC 60364-5-52)
3Terms 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 timeand at any point on the system
NOTE lt 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 timeand at any point on the system
NOTE lt 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 whichelectrical 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 utilizationequipment is intended to be connected to the fixed installation.IEC 60038 pdf download.