In short, any device that has a flexible cable, a removable plug and is not low voltage (not exceeding 50V). This includes extension leads, cord sets and portable RCD’s.
Generally, electrical appliances can be classed as either:
Class I – this is an earthed appliance i.e. kettles, irons and toasters
Class II – double insulated appliances, which are usually identified with a symbol (a square within a square) or with the words ‘Double Insulated’ i.e. most electric drills and hair dryers
It’s worth mentioning that new equipment doesn’t need to be tested – just visually inspected and tagged.