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The IEC 60950-1 standard is applicable to mains or battery-powered information technology (IT) equipment and office machines with a rated voltage not exceeding 600V. IEC 60950-1 consolidates the 2005 2nd edition of this standard with its first and second amendments (from 2009 and 2013 respectively). It is intended to prevent injury and damage to persons and property from hazards such as electric shock, fire, dangerous temperatures and mechanical instability. Note that in Germany this standard is also referenced as DIN EN 60950-1 and as VDE 0805. Within this standard there are three classes of protection. Class I protection uses basic insulation and protective earth grounding for all conductive parts that could assume a hazardous voltage. Class II protection uses double or reinforced insulation to eliminate the need for a ground. Class III products operate from a SELV (separated extra low voltage) supply circuit to eliminate the possibility of electric shock.
