Kaksoiseristystä
Kaksoiseristystä, known in English as double insulation, is an electrical safety standard used in electrical equipment. It is designed to protect users from electric shock by providing two independent layers of insulation between live electrical parts and the user. This is achieved through a combination of basic insulation and supplementary insulation. Basic insulation is the primary layer that prevents contact with live parts under normal operating conditions. Supplementary insulation is an additional layer of protection that functions even if the basic insulation fails.
Equipment that meets the double insulation standard is typically marked with a symbol depicting a square within
The concept of double insulation originated from the need to enhance electrical safety, especially for portable