What are the types of Class I, II, III, 0, 01 in Electrical Appliances ?

What are the types of Class I, II, III, 0, 01 in Electrical Appliances ?
    Basically, a Portable appliance is given a Class rating by the manufacturer depending on how the user is protected from Electrical Shock.      Electrical appliances classes defined in IEC 61140, and are categorized into one of...