At international level, the most important publishers of engineering standards are probably the International Electrotechnical Commission (IEC) and the International Organization for Standardization (ISO), both of which are based in Geneva. While the IEC is primarily concerned with electrical and electronic issues, ISO deals mainly with mechanical issues. Well over 100 countries are currently members of the two organizations, which gives considerable weight to those standards developed by IEC and ISO.
The EN standards are applied at European level. EN standards are normally developed through CEN and CENELEC as an EU initiative. As with IEC and ISO, CEN and CENELEC divide up the standards. CENELEC is responsible for electrical issues.
Today, many standards are developed almost in a package as an IEC or ISO standard in cooperation with the EU via CEN and CENELEC. EN IEC or EN ISO standards are the result of these efforts.
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