• Introduction

 Earthing refers to conductive connection of zero conductors, parts connected to these and non-active parts in an electrical installation with the earth through an electrode.

Earthing installation should be used in access networks in order for the protection systems (protective plugs), which are used against possible external over voltage and currents, to be able to be affective and protection to be achieved successfully. The earthing resistance is targeted to be as little as possible. Earthing is conducted in line with the standards below and materials such as salt, which speed up corrosion and rusting, should definitely not be used for the purpose of decreasing earthing resistance.

Earthing conductor: It is a conductor, which achieves the connection between the element to be earthed and earthing electrodes, which is not isolated and is isolated only on very rare occasions. Earthing conductor should be installed from a short distance.

Earthing Electrode: It is a conductive, plate or rod-shaped material which is used between the earthing conductor and earth and transmits the current from earthing installation to the earth.

Specific earth resistance: Specific earth resistance value should be taken into consideration during conduct of earthing.

Earthing electrode spreading resistance: Spreading resistance of an earthing electrode depends on specific earth resistance and sizes and regulation pattern of the earthing electrode.

Earthing Installations According to Places of Use:

a) Earthing in Distribution Frame

b) Earthing in Network Box

c) External Type Active Access System Cabin Earthing

d) Earthing in Distribution Box

e) Earthing in Conductive Copper Cables

f) Earthing in Fiber Optic Cables