D.G.Electrical Services
D.G.Electrical Services

Electrical Definitions

At times it can be hard keeping up with the language electrical installers used. Here's some electrical definitions and a small synopsis to help you understand the language electricians used.

AC   Alternating Current
ADOS   Automatic Disconnection of Supply
Amp   Unit of electric current
Band I Circuit    Any circuit which runs at less than 50v
Band I I Circuit   Any wiring that carries mains voltage
Belling Out   Slang for testing installations
BS7671   The wiring regulations which is the standard that electrical installations must adhere to
BESA Box   A conduit fitting box
Cartridge Fuse   A fuse inside  a ceramic tube
Clicks   A connection unit usually used in a lighting installations
Class I Equipment   Equipment that runs on mains electricity and requires an earth
Class I I Equipment   Equipment that runs on mains electricity and does not requires an earth
Conduit   A form of mechanical protection for the installation of cables which can be either PVC or Steel
Consumer Unit   Might also be referred to as a Distribution Board, Board, Wylex Unit,Fuse Board, Mains, Mains Board, Consumer Box, Split Load Board or 17th Edition Board
CPC   Circuit Protective Conductor i.e. earth conductor
CSA   Cross Sectional Area usually of a cable
CTs   Current Transformers
Current   A measure of electricity flowing in a circuit
DC   Direct  Current
Earth Fault Loop Impedence   Impedence of the live circuit from a house back to the dub station which proves that the resistance is low enough to disrupt the protective device for that particular circuit within the prescribed in the wiring regulations
Earth Electrode   Usually a Rob but not always - driven into the ground to earth a property. Used in T T earthing systems
Earth Fault   A short circuit between the Live and the Earth
Earthing System   Description of the type of earthing system in use
Electrical  Installation Certificate (EIC)   Used for the installation of a new circuit that records the results of tests that must be undertaken to prove the system is safe to be energised. Once the system is energised, it then records all of the live test results
Exposed Conductive Part   A metal part which can be touched and is not normally live but could become so when basic insulation fails
Extra Low Voltage   A voltage not exceeding 50Volts
Extraneous Conductive Part   A metal part which could under fault conditions introduce a voltage into a property
Fast Fix Box   A socket or switch box usually installed after plastering has taken place
Fault Current   A current which makes your protective device operate
Fault Protection   A system put in place to prevent persons receving a shock under fault conditions
Impedence   Opposition to current flow
Insulation Resistance   A test on the system to ensure the system is satisfactory for energisation
IP Rating   A rating given to an item for differing degrees of ingress i.e. solids, moisture or water. Most typically quoted for products being used outside or in bathrooms
LABC   Local Authority Building Control
Line Conductor    Usually the live conductor
Main Protective Bonding Conductor   A conductor installed from the Mains earth terminal to all extraneous conductive parts
MET   Main Earthing Terminal
MCB   Miniature Circuit Breaker
Megger   Refers to  brand of testing equipment
Minor Works Certificate   Used for an addition to an existing circuit that records the results of tests that must be undertaken to prove the system is safe to be energised. Once the system is energised,  it then records all of tjhe live test results
OHM   Unit of electrical impedence or resistance
OSG   On Site Guide which provides contractors general guidance as to how to meet the requirements of the regulations
Oveload Current   An over current in a healthy circuit e.g. too many items plugged in to a kitchen ring and the MCB keeps tripping
PIR   Periodic Inspection Report is a an electrical report on an existing installation
PME   Protective Multiple Earthing
Polarity Testing   To prove a fuse or switch is fitted in the line conductor
Prospective Fault Current   A measurement to simulate the largest fault current which would flow in the event of a short circuit
Pyro   Slang for mineral insulated cable
Resistance   The opposit to current flow
Rewirable fuse   A fuse wire in a fuse carrier that is open to inspection Officially BS3036
RCD   A unit that monitors current flow in a circuit and will trip if it detects a small leakage to Earth
Safe Zone   A zone within a wall whrere buried cables can be safely installed
Short Circuit   A fault occuring between Line and Neutral
Spur   An extension to a ring or radial circuit
Tube   Slang for Conduit of any type
Volt\Voltage   Unit of electricity rating usually 230Volts for UK domestic circumstances
WATT   Unit of electric power
Ze   Earth fault loop impedance at the origin of supply
Zs   Earth fault loop impedance at the end of a circuit including the Ze value

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