The A –Z of the electrical industry:
British Standard BS 7671 – also known as the IEE (Institute of Electrical Engineering) wiring regulations. Details the requirements for electrical installations and is the standard against which all NICEIC contractors are assessed. To enrol with NICEIC all electricians, and anyone they employ, must meet this national safety standard.
Any electrician installing a new electrical installation (including a single circuit), altering, extending or adapting an existing circuit should issue the homeowner with electrical installation certificate or minor electrical installation works certificate to confirming the work complies with the requirements of BS 7671.
An assembly of electrical equipment (socket outlets, lighting points and switches) supplied from the same origin and protected against over current by the same protective device(s).
A device capable of making, carrying and breaking normal load currents and also making
and automatically breaking, under pre-
Class I equipment
Equipment in which protection against electric shock does not rely on basic insulation
only, but which includes means for the connection of exposed-
Class II equipment
Class II equipment, such as music systems, television and video players, in which protection against electric shock does not rely on basic insulation only, but in which additional safety precautions such as supplementary insulation are provided, there being no provision for the connection of exposed metalwork of the equipment to a protective conductor, and no reliance upon precautions to be taken in the fixed wiring of the installation.
Class III equipment
Equipment, for example for medical use, in which protection against electric shock relies on supply at SELV (Safety extra low voltage) and in which voltages higher than those of SELV are not generated. Class III equipment must be supplied from a safety isolating transformer.
Also known as a fusebox, consumer control unit or electricity control unit. A particular
type of distribution board comprising a co-
An assembly containing switching or protective devices (e.g. fuses, circuit-
Any assembly of electrical equipment supplied by a common source to fulfil a specific purpose.
Electrical Safety Regulations
NICEIC registered electricians have already helped to improve the standard of electrical
work in the UK. A new electrical safety law, often referred to as Part P of the Building
Regulations, has further enhanced the protection of homeowners and reduced the risk
of electric shock when using electricity. The law, which applies to England and Wales
aims to improve electrical safety in the home and prevent the number of accidents,
which are caused by faulty electrical work. The law requires an electrician registered
with a government-
An extension cable, also known as a power extender, extension cord or an extension
lead, is a length of flexible electrical power cable or flex with a plug on one end
and one or more sockets on the other end -
Milliamp or 1/1000 part of an amp
Electrical current (in amps) that exceeds the maximum limit of a circuit. May result in risk of fire or shock from insulation damaged from heat generated by overcurrent condition.
The specific section of the Building Regulations for England and Wales that relates
to electrical installations in domestic properties. Part P provides safety regulations
to protect householders, and requires most domestic electrical work to be carried
out by government-
Inspection and testing of electrical equipment including portable appliances, moveable equipment, hand held appliances, stationary equipment, fixed equipment/appliances, IT equipment and extension leads.
An electrical survey, known as a Periodic Inspection Report (PIR) will reveal if electrical circuits are overloaded, find potential hazards in the installation, identify defective DIY work, highlight any lack of earthing or bonding and carry out tests on the fixed wiring of the installation. The cost of a typical PIR should start around £100, depending on the size of your property. The report will establish the overall condition of all the electrics and state whether it is satisfactory for continued use, and should detail any work that might need to be done.
Broad term for insurance which covers liability exposures for individuals and business owners. Homeowners should check that their electrician has public liability insurance, which covers them if someone is accidentally injured by them or their business operation. It will also cover them if they damage your property while on business. The cover should include any legal fees and expenses which result from any claim by you. Homeowners looking to employ trades people to undertake work on their homes should ensure the companies selected have suitable cover – minimum recommendation is £2 million.
Electrical equipment which is less than 18 kg in mass and is intended to be moved while in operation or which can easily be moved from one place to another, such as a toaster, food mixer, vacuum cleaner, fan heater.
Prospective fault current
The value of overcurrent at a given point in a circuit resulting from a fault between live conductors.
This is not just a manually operated isolating switch, but a very sensitive safety device which cuts off in fractions of a second if it senses an earth fault. RCDs can be bought in different current ratings and various sensitivities to current leakage.
Ring final circuit/ring main/ ring
A final circuit connected in the form of a ring and connected to a single point of supply.
Normally not exceeding 50 V a.c. or 120 V ripple-