ETSI Harmonised Standard
A harmonised standard is a technical reference text that can be followed to meet the essential requirements of a directive; applying it creates a presumption of conformity. On the radio side, the EN 300 220 series is used for sub-GHz short range devices, EN 300 328 for 2.4 GHz, and the EN 301 489 series for electromagnetic compatibility.
Harmonised standards are not mandatory; a manufacturer may meet the requirements by other means. However, when you apply a standard published in the official list, you are presumed to have met the relevant essential requirements and the process becomes predictable.
- Separation of scope: the standards regulating radio performance are separate from those regulating electromagnetic compatibility; the two are applied together.
- Version matters: standards are revised, and which version confers the presumption of conformity is set by the official list. That is why the version is written in the declaration too.
- Product selection: which standards a product was assessed against also shows which band and conditions it was designed for.
There is no need to memorise this in the field; when you need it, looking at the product's declaration of conformity is enough. Since this document is requested in corporate procurement and when compiling a machine's technical file, asking the supplier for it up front shortens the process.
Context where this term is used: Wireless remote control installation: pairing, relay, safety