Mandatory compliance for power suppliers to ensure industrial and household equipment functions correctly.

Sites like GOST.ru or legitimate technical library databases (e.g., Technorm) offer the most accurate, up-to-date, and officially certified text.

Many online forums and document sharing sites provide free downloads. While usually accurate, it is crucial to ensure the PDF includes all amendments and is not a corrupted scan of the 2013 version.

Specifies limits for harmonic components and frequency fluctuations.