Protection Against Electric Shock
Protection against electric shock by indirect contact can be achieved by one of the following methods as listed in the ETCI Rules.
1. Earthing and Automatic Disconnection of the Supply. ( This method will be dealt with later on ).
2. Provision of Supplementary Insulation ( Class 2 equipment ). ( This method will be dealt with now ).
3. Non-Conducting Location and Earth Free Local Equipotential Bonding. ( This method is not within the scope of this course ).
4. Electrical Separation.
( One aspect of this method will be dealt with later on ).
Protection by Supplementary Insulation.
This protective measure is achieved by insulating exposed conductive parts, which might become live in the event of a fault, in the basic insulation. This method of insulation is used in Class II equipment, commonly called double-insulated equipment and bearing the symbol shown in Figure 15