IEC 60335-1
"Appliances shall be marked with the
– rated voltage or rated voltage range in volts;
– symbol for nature of supply, unless the rated frequency is marked;
– rated power input in watts or rated current in amperes;
– name, trade mark or identification mark of the manufacturer or responsible vendor;
– model or type reference;
– symbol 5172 of IEC 60417, for class II appliances only;
– IP number according to degree of protection against ingress of water, other than IPX0."
Compliance is checked by inspection.
NOTE 1 The first numeral of the IP number need not be marked on the appliance.
NOTE 2 Additional markings are allowed provided they do not give rise to misunderstanding.
"NOTE 3 If components are marked separately, the marking of the appliance and that of the components is to be such that there can be no doubt with regard to the marking of the appliance itself."