Frequently Asked Question

What is the difference between basic and double (or reinforced) insulation levels?

In general, protection against electric shock may be provided by adequate clearance (a physical spacing from the live part) or by one of two insulation levels. These insulation levels are basic insulation and double (or reinforced) insulation. The required insulation level is determined by the voltage levels involved as well as the presence or absence of a connection from accessible parts to earth ground. In general, compared to an isolator providing basic insulation, an isolator providing double or reinforced insulation has greater requirements on its test voltage as well as on its input-to-output spacing. The required insulation level is defined by the specific safety standard for the end-equipment under consideration.