View source for IEC 60038

{{1R|date=March 2017}}{{Use British (Oxford) English|date=January 2012}}
International Standard '''[[Organization:International Electrotechnical Commission|IEC]] 60038''', ''IEC standard voltages'', defines a set of standard voltages for use in [[Physics:Low voltage|low voltage]] and [[Physics:High voltage|high voltage]] [[Physics:Alternating current|AC]] and [[Physics:Direct current|DC]]  electricity supply systems.

== Low voltage ==
Where two voltages are given below separated by "/", the first is the root-mean-square voltage between a phase and the neutral connector, whereas the second is the corresponding root-mean-square voltage between two phases (exception: the category shown below called "One Phase", where 240 V is the root-mean-square voltage between the two legs of a split phase). The three-phase voltages are for use in either four-wire (with neutral) or three-wire (without neutral) systems.

=== Three-phase 50 Hz ===
* 230 V / 400 V (formerly 220/380 V)
* 400 V / 690 V (formerly 380/660 V)
* 1000 V phase to phase (3 wire)

Suppliers using 220 V / 380 V or 240 V / 415 V systems were expected by the standard to migrate to the recommended value of 230 V / 400 V by the year 2003. This migration has already been largely completed, at least within the European Union.

=== Voltage conversion schedule ===
{| class=wikitable
! Year !! Neutral-Phase [V] / Phase-Phase [V] !! Tolerances<ref name=sitech/>
|-
| &mdash; 1987      || 220 V / 380 V || – 10% .. +10% 
|-
| 1988 &mdash; 2003 || 230 V / 400 V || – 10% .. + 6%
|-
| 2003 &mdash;      || 230 V / 400 V ||  - 5% .. + 5%
|}

=== Three-phase 60 Hz ===
* 120 V / 208 V
* 240 V
* 230 V / 400 V
* 277 V / 480 V
* 480 V
* 347 V / 600 V
* 600 V / 1000 V

=== One-phase, three-wire 60 Hz (American split-phase) ===
* 120 V / 240 V

== Table 3  1 kV to 35 kV ==
Table 3 of IEC 60038 lists nominal voltages above 1 kV and not exceeding 35 kV. There are two series, one from 3 kV up to 35 kV

== Table 4 35 kV - 230 kV ==
Table 4 shows nominal voltages above 35 kV and not exceeding 230 kV.

== Table 5 245 - 1,200 kV == 
Table 5 is systematically different, as the highest voltage for equipment is the characteristic value exceeding 245 kV. The enumeration begins at 300 kV and ends with 1200 kV.

== See also ==
* [[Physics:Mains electricity by country|Mains electricity by country]]

== References ==
<references>
<ref name=sitech>[https://archive.today/20130411020347/http://webcache.googleusercontent.com/search?q=cache:DortT_ULynsJ:http://www.automation.siemens.com/mcms/infocenter/dokumentencenter/sc/pp/Documentsu20Catalogs/E86060-K2410-A111-A8-7600_KT10_1_2012_en_kap_16.pdf%2B220 googleusercontent.com/siemens.com - Technical information and configuring notes], 2011</ref>
</references>

== External links ==
* [https://web.archive.org/web/20100822180609/http://www.electrical-installation.org/wiki/Electrical_installation_rules,_standards Definition of Voltage ranges as per IEC 60038] – WIKI - Electrical Installation Guide
* {{IEC|60038:1983}}
* https://webstore.iec.ch/preview/info_iec60038%7Bed7.0%7Db.pdf 
{{List of IEC standards}}
[[Category:Electric power distribution]]
[[Category:IEC standards|#60038]]
[[Category:Electrical wiring]]

{{Sourceattribution|IEC 60038}}