Grounding, Earthing and Protection Against Lightning Procedure as Bangladesh Electricity Distribution Code

Everyond Should Follow the Electrical Safety Code to Keep Electricity Safe for Everywhere
If you not follow the electricity safety code it's may danger anytime

Why is Earthing Necessary in electrical systems?

The main purpose of the earthing of any electrical appliances is to protect it from carrying current due to accidentally contact with the live wire or what is called the phase wire of the power supply system. It is a good practice to provide two parallel connections of the earth conductor to any electrical installation whether it is domestic or industrial use. Normally Copper wire or strip is used as earthing conductor but now a days it is replaced by Galvanized Iron or Aluminum conductor is also used since Copper is costly and chances of theft or pilferage is high .


There are three wires which run through the domestic electrical circuits.

  • Live wire
  • Return or Neutral wire
  • Ground or Earth wire.
In a normal situation when an appliance is switched on the circuit completes it's path from live wire to return wire.

But in case if a splice of live wire comes in contact with the metal part of the appliance, then the user has chance of getting shock because he completes the circuit with ground as the return conductor.

In order to ensure safety of the users, a simple concept of current is followed I.e. current flows through the lowest resistance path. A Earth wire of the domestic household is connected to all the power appliances which connected to the earthing pit and Earth point at the METER.

With the Earth wire now the circuit from appliance metallic Parth to Earth wire is the lowest return path so the users are saved from electrical shock.

The resistance of the Earth wire circuit is in the order of tens of ohms where ad the resistance of Human body is between 500 k ohms to Mega ohms.

What says about Grounding , Eatrhing and Protection against Lightning on Bangladesh Electricity Code?



As per Annex G-04 Section 6 ERQ Distribution Code, the ELECTRICITY DISTRIBUTION CODE (UPDATED DRAFT) on November, 2012, Chapter 14 OVERHEAD LINES, UNDER GROUND CABLES AND GENERATING STATIONS, Clouse 15, 17 & 19 described about Grounding, Earthing and Protection against Lightning  respectively.

Let's see the the detail step by step:


Guarding as per Bangladesh Electricity Distribution Code

  1. Where guarding is required under these clauses the provisions of 15(2) to (4) shall apply. 
  2. Every guard-wire shall be connected with earth at each point at which its electrical continuity is broken. 
  3. Every guard-wire shall have an actual breaking strength of not less than 635 kg and if made of iron or steel, shall be galvanized. 
  4. Every guard-wire or cross-connected systems of guard-wires shall have sufficient current-carrying capacity to ensure the rendering dead, without risk of fusing of the guard-wire or wires till the contact of any live wire has been removed. 
You may read details about earthing system on separate full article on 


Earthing as per Bangladesh Electricity Distribution Code

  1. All metal supports and all reinforced and pre-stressed cement concrete supports of overhead lines and metallic fittings attached thereto, shall be permanently and efficiently earthed. For this purpose, a continuous earth wire shall be provided and securely fastened to each pole and connected with earth ordinarily at three points in every km, the spacing between the points being as nearly equidistant as possible. Alternatively, each support and the metallic fitting attached thereto shall be efficiently earthed. 
  2. Metallic bearer wire used for supporting insulated wire of low voltage overhead service lines shall be efficiently earthed or insulated. (3 Each stay-wire shall be similarly earthed unless insulator has been placed in it at a height not less than 3.0 meters from the ground. 

 You may read details about earthing system on separate full article on 

Protection against lightning as per Bangladesh Electricity Distribution Code



  1. The owner of every overhead line, substation or generating station which is so exposed as to be liable to injury from lightning shall adopted efficient means for diverting to earth any electrical surges due to lightning. 
  2. The earthing lead for any lightning arrestor shall not pass through any iron or steel pipe, but shall be taken as directly as possible from the lightning-arrestor to a separate earth electrode and/or junction of the earth mat already provided for the high and extra high voltage substation subject to the avoidance of bends wherever practicable.  Note-A vertical ground electrode shall be connected to this junction of the earth mat. 
You may read details about earthing system on separate full article on 

One of the thing you eventually realize about electricity is that everything you do is differences in potentials, or voltages. A circuit with a high of 10V to a low of 5V is really the same as a circuit with a high of 5V and a low of 0V. Earth is our ultimate zero reference. Think about the electric lineman in a helicopter fixing voltage transmission lines in the 10,000’s of volts. They are ok, because the of reference frame they are in, it is 10,000V relative to earth, but relative to the lineman its zero. Because the lineman is not referenced to earth, he/she is not tied to ground. And they live. Is “earth” important yes it is, especially when dealing with electrical systems at different potentials, or with systems that are physically a distance from each other.

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