The IET Code of Practice for In-Service Inspection and Testing of Electrical Equipment (4th Edition) states that all electrical systems and equipment should be maintained if danger would otherwise arise.
Other than fixed installation, which is considered to be the installation from the meter point to the socket outlet, or fuse connection unit, all electrical equipment in an installation, whether permanently connected or connected by plug and socket outlet, should be inspected and tested in accordance with the recommendations contained within this Code of Practice.
The Code of Practice provides guidance on the various equipment types:
Portable appliances or equipment: A portable appliance is an item of equipment less than 18kg in weight that is intended to be moved while in operation, or an appliance that can be easily moved from one place to another.
Movable appliances or equipment (sometimes called transportable): An item of movable equipment is equipment that is either:
- 18kg or less in weight and not fixed (for example an electric compressor), or
- Equipment with wheels, castors or other means to facilitate movement by the operator as required to perform its intended use (for example an air-conditioning unit).
Equipment or appliances for building in: An appliance or equipment for building in is equipment intended to be installed in a prepared recess such as a cupboard or similar. In general, this will be equipment for general business use, such as printers, scanners, credit card reading equipment, photocopiers etc.
Hand-held equipment or appliances: A hand-held appliance or piece of equipment is equipment intended to be held in the hand during normal use, such as an angle grinder, iron, hairdryer, hedge-cutter, soldering iron, power drill etc.
Stationary equipment or appliances: An item of stationary equipment or a stationary appliance is equipment that has a mass exceeding 18kg and is not provided with a carrying handle, such as a refrigerator, vending machine etc.
Fixed equipment or appliances: An item of fixed equipment or a fixed appliance is equipment that is fastened to a support or otherwise secured in a specific location, such as a central heating boiler, hand dryer, fixed air-conditioning unit, bathroom heater, electric tower rail, etc.
Information technology equipment: Information technology (IT) equipment includes computers, mains-powered telecommunications equipment and other equipment for general business use.