IEC 60038:2009 pdf free download – IEC standard voltages
1 Scope
This publication applies to
– a.c. transmission, distribution and utilization systems and equipment for use in such systemswith standard frequencies 50 Hz and 60 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 and 60 Hz applications;such equipment covers batteries (from primary or secondary cells),other power supplydevices (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 measuredvalues.
This publication does not apply to standard voltages of components and parts used withinelectrical 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 thehistorical development of electrical supply systems throughout the world, since these values turned out to be themost 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 basisfor design 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.
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 editionof the referenced document (including any amendments) applies.
IEC 60364-5-52:Electrical installations of buildings – Part 5-52: Selection and erection ofelectrical equipment- Wiring systems
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.
In Table 1,the three-phase four-wire systems and single-phase three-wire systems includesingle-phase circuits (extensions,services,etc.) connected to these systems.
The lower values in the first and second columns are voltages to neutral and the highervalues are voltages between phases. When one value only is indicated, it refers to three-wiresystems and specifies the voltage between phases.The lower value in the third column is thevoltage to neutral and the higher value is the voltage between lines.
Voltages in excess of 230/400 v are intended for heavy industrial applications and largecommercial premises.
Concerning supply voltage range，under normal operating conditions,the supply voltageshould not differ from the nominal voltage of the system by more than ±10 %.
For the utilization voltage range, in addition to the voltage variations at the supply terminals,voltage drops may occur within the consumer’s installations. For more information， seeIEC 60364-5-52. This utilization voltage range should be taken into account by productcommittees.
NOTE The highest and lowest voltage values at supply terminals and at utilization terminals,as they can bederived from the above and from lEC 60364-5-52:2001, are provided for information in AnnexA.