All electrical portable devices should be tagged and tested by a qualified electrician especially in the work place where many different people can come into contact with electrical devices.

Construction/ Demolitions Areas electrical equipment should be tagged and tested every 3-12 months dependant on the type of equipment.
Service Areas electrical equipment should be tagged and tested every 3-12 months dependant on the type of equipment.
Office Work Areas electrical equipment should be tagged and tested every 6-24 months dependant on the type of equipment.
Manufacturing Work Areas electrical equipment should be tagged and tested every 6-12 months dependant on the type of equipment.

Always make sure that the electrical equipment that you are about to use is protected by an EARTH LEAKAGE PROTECTION DEVICE..