Product categories & certification
Certification is often a key issue for electrotechnical products in the market. Because market conditions and certification requirements for such a huge array of products vary widely around the world, the IEC has found it most practical and convenient to distinguish four categories of products for EMC standardization purposes:
In the EMC context, these are combinations of apparatus and/or components constituting a single functional unit and intended to be installed and operated to perform a specific task. A good example is a computer system comprising a CPU, monitor, keyboard, mouse, printer, etc.
In this case, and in particular to ensure "internal" or intrasystem compatibility, separate EMC standards may be developed for each component or apparatus. To ensure "external" compatibility with other systems in the same location, and for certification purposes, an overall EMC standard for the whole system may be considered.