CENELEC is the European Committee for Electrotechnical Standardization and is responsible for standardization in the electrotechnical engineering field. CENELEC prepares voluntary standards, which help facilitate trade between countries, create new markets, cut compliance costs and support the development of a Single European Market.

For further information please click the About link.

CENELEC publications

CENELEC concentrates most of its work on two key publications: The European Standard (EN) and the Harmonization Document (HD). These two documents are commonly referred to as "standards" and must be implemented in all CENELEC member countries, who must also withdraw any conflicting standards.

EN - European Standard: It is a normative document available, in principle, in the three official languages of CENELEC (English, French and German) that cannot be in conflict with any other CENELEC standard. EN's are the most important documents published by CENELEC. Its development is governed by the principles of consensus, openness and transparency. There is also a national commitment to implement it as a national standard in each of the member countries of CENELEC. 

HD - Harmonization Document: Same characteristics as the EN except for the fact that there is no obligation to publish an identical national standard at national level (may be done in different documents or parts), taking into account that the technical content of the HD must be transposed in an equal manner everywhere.

European standards are mostly based on international IEC-standards. EN standards have to be implemented as technically identical national standards. There are a few differences in the implementation process of EN's and HD's. Basically, the EN must be transposed as it is, not adding or deleting anything. The process for HD's is a bit more flexible. It is the technical content that must be transposed, no matter the wording or how many documents are made from it.

Because EN standards have to be implemented to technically identical national standards, it is necessary nationally to follow standardization work and to contribute continuously to different phases of standards’ preparation processes.

The preparation of standards is illustrated in the following schemes:

This website stores cookies on your computer. These cookies are used to improve our website and provide more personalised services to you.


To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too.

1. What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

2. How do we use cookies?

A number of our pages use cookies to remember your actions and preferences (such as login, language, font size and other display preferences.)

Also, some videos embedded in our pages use a cookie to anonymously gather statistics on how you got there and what videos you visited.

Enabling these cookies is not strictly necessary for the website to work but it will provide you with a better browsing experience. You can delete or block these cookies, but if you do that some features of this site may not work as intended.

The cookie-related information is not used to identify you personally and the pattern data is fully under our control. These cookies are not used for any purpose other than those described here.

3. How to control cookies

You can control and/or delete cookies as you wish – for details, see aboutcookies.org. You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.