International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 60027-7:2010
Title Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution
Project Number 21944
Abstract/Scope IEC 60027-7:2010 is applicable to generation, transmission, and distribution of electric energy. It gives names and letter symbols for quantities and units. In addition, rules for multiple subscripts and their succession are given. It is an addition to IEC 60027-1. Therefore letter symbols already given in IEC 60027-1 are repeated only if they have a special meaning in the field of power generation, transmission, and distribution or if they are used in this field with special subscripts.


Current Stage code 6060
Current Stage code date 2010-09-10
Current Stage code deadline 2011-06-01
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 25
Reference Document IEC 60027-7:2010 (EQV)
ICS 01.060 - Quantities and units
Keywords Letter; Symbol; Power generation; Transmission; Distribution
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2010-09-10 2011-06-01 export to doc file  EN  FR  DE
5099 2010-09-01 2010-10-07  
5061 2010-06-28 2010-09-01  
5060 2009-06-12 2009-06-30 export to doc file  EN
5020 2008-07-18 2008-12-19  
1090 2008-07-15 2008-07-18  

Implementation Dates

date of Ratification (DOR) (1) 2010-09-01
date of Availability (DAV) (2) 2010-09-10
date of Announcement (DOA) (3) 2010-12-01
date of Publication (DOP) (4) 2011-06-01
date of Withdrawal (DOW) (5) 2013-09-01


Superseded by  
Normative reference (6) EN 60027-1
EN 60027-2
EN 60038
IEC 60050-121
IEC 60050-131
IEC 60050-141
IEC 60050-151
IEC 60050-195
IEC 60050-411
IEC 60050-421
IEC 60050-441
IEC 60050-442
IEC 60050-448
IEC 60050-466
IEC 60050-601
IEC 60050-603
IEC 60050-604
IEC 60050-811
EN 60909-0
IEC/TR 60909-1
IEC/TR 60909-2
EN 60909-3
EN 62428
EN 80000-6

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.