EARTHING
Earth – In this context when we use the word ‘Earth’ we mean the general mass of the earth, which we treat as having an electrical potential of zero.
Earth Electrode – Usually a solid copper rod that is driven into the ground to provide a means of earthing in TT earthing systems.
Bonding Conductor – A conductor that provides protective equipotential bonding.
TN-S – A means of earthing commonly utilised in the U.K., the line, neutral and earth conductors enter the building as one cable, the line and the neutral conductors are in the centre of the cable and the lead sheath on the outside of the cable acts as the earth conductor.
TN-C-S – A means of earthing commonly used in the U.K., in this cable the neutral conductor is also the earth conductor, this is known as a PEN (Protective Earth and Neutral) conductor.
TT – A means of earthing commonly used in the U.K., in this installation there is no earth cable supplied by the distributor, instead use is made of a locally fitted earth electrode.
Earthing – This involves connecting the exposed conductive parts of an installation (such as gas and water pipes) to the main earthing terminal of the installation.
MET – Main Earth Terminal, this is where all the earthing conductors are connected, from here they are connected back to the installations means of earthing.
Earthing conductor – This is the conductor that connects the main earthing terminal to the means of earthing for the installation.
Equipotential bonding – this is where extraneous-conductive-parts are connected together to keep them at the same potential and reduce the risk of electric shock.
PEN conductor – Protective Earth and Neutral, this is one conductor that combines the functions of a neutral conductor and a protective conductor, the most commonly found example is in a TN-C-S earthing system.
Protective equipotential bonding – Equipotential bonding that has been installed to provide safety.
PME – Protective Multiple Earthing, this is the practice of connecting the PEN conductor of a TN-C-S arrangement to earth periodically along its length
EARTHING
Earth – In this context when we use the word ‘Earth’ we mean the general mass of the earth, which we treat as having an electrical potential of zero.
Earth Electrode – Usually a solid copper rod that is driven into the ground to provide a means of earthing in TT earthing systems.
Bonding Conductor – A conductor that provides protective equipotential bonding.
TN-S – A means of earthing commonly utilised in the U.K., the line, neutral and earth conductors enter the building as one cable, the line and the neutral conductors are in the centre of the cable and the lead sheath on the outside of the cable acts as the earth conductor.
TN-C-S – A means of earthing commonly used in the U.K., in this cable the neutral conductor is also the earth conductor, this is known as a PEN (Protective Earth and Neutral) conductor.
TT – A means of earthing commonly used in the U.K., in this installation there is no earth cable supplied by the distributor, instead use is made of a locally fitted earth electrode.
Earthing – This involves connecting the exposed conductive parts of an installation (such as gas and water pipes) to the main earthing terminal of the installation.
MET – Main Earth Terminal, this is where all the earthing conductors are connected, from here they are connected back to the installations means of earthing.
Earthing conductor – This is the conductor that connects the main earthing terminal to the means of earthing for the installation.
Equipotential bonding – this is where extraneous-conductive-parts are connected together to keep them at the same potential and reduce the risk of electric shock.
PEN conductor – Protective Earth and Neutral, this is one conductor that combines the functions of a neutral conductor and a protective conductor, the most commonly found example is in a TN-C-S earthing system.
Protective equipotential bonding – Equipotential bonding that has been installed to provide safety.
PME – Protective Multiple Earthing, this is the practice of connecting the PEN conductor of a TN-C-S arrangement to earth periodically along its length
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