The earth electrode and grounding conductor system of customer and Distribution Company for LV service entrance as per standard BS7671 TT & TN-S System:
The
conductive mass of earth whose voltage at any point is generally consider as
zero. The earth is the reference point for any voltage, eg- the system voltage
is 33kv or 33,000 volt means earth to conductor voltage difference is 33kV.
The
focus point of this article is on earthed system for LV wiring system
accumulation at connection point of utility company and consumer premises.
Customer
Earthed system:
Customer earthed system is, where the Customer
provides a Main Earth Terminal for the Installation, which is connected to a
sufficient number of local Earth Electrodes. This system is also known as TT system when follows the British Standard BS7671 TT system.
Distribution Company Earthed system:
Distribution
company earthed system is, where the Distribution Company provides a connection
to the Customer’s Main Earth Terminal using the distribution network Earthing
system. Generally Distribution Company makes earthing via the armoring or
metallic sheath of the main incoming supply cables. This system is also known
as TN-S system when it follows British
Standard BS7671 TN-S system.
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Earth Conductor & Earth Electrode:
The
protective conductor that used to connect the exposed metallic parts of an
electrical installation and associated appliances to earth is Earth Conductor.
This may also be known as the Circuit Protective Conductor (CPC) or Earth
Continuity Conductor (ECC) or commonly known as the ‘earth wire’.
Earth
Electrode is a piece of conductor rod or group of conductors in closed contact
with Earth, providing a good electrical connection to Earth having measurable
low resistance of earth, earth resistance for premise wiring is desired below
one Ohm. Earth Electrode also known as Earth
Rod
or Grounding Rod.
Main Earth Terminal:
The main connection point at which the nominal
value of Earth Resistance for an installation is taken and at which Earth
Conductors from the Earth Electrodes will be connected. This will normally be
at or close to the customer connection point.
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