Distribution Board Wiring Diagram For Single Phase Wiring

When we start a project of electrical wiring the first and the main control point of wiring is the distribution board. Distribution board wiring is very important for controlling the E wiring. For this post i designed a diagram about distribution wiring, we can call this circuit breaker or controlling fuse box. In the diagram is shown the method of wiring distribution mainboard form utility pole to Energy meter and then DP circuit breaker and SP MCB breaker.
However, we study all step by step distribution board wiring below, as we talking about the distribution main board diagram, first see this.

distribution board wiring

How to Distribution Board Wiring Diagram for Single phase Wiring with DP MCB, SP MCB, earth, voltmeter, ammeter for Home wiring

In the above diagram I have shown the complete method of wiring, I wired an energy meter after that a double pole, and then single pole breakers for each room or each point of circuit load. The main reason for this board in E wiring is that we can control the complete wiring from this place. That's why we can call him the main circuit breaker box. In the above image, I provide the complete instruction needed however lets do study some parts with details.

Also, read.
How to wire a circuit box for the different loads?

So let's disuse the distribution board wiring diagram step by step. In the diagram, I start from the utility pole to the energy meter. So let's do it step by step with examples.

Energy meter wiring

In the above diagram, I have taken electric supply from utility pole to single phase energy meter and then I connect the supply to the distribution mainboard. If you did not know about the energy meter wiring then read the below post

How to wire single phase energy meter?

Double Pole Circuit Breaker

In the mainboard, I first wired the double pole or DP MCB circuit breaker. MCB means Miniature Circuit breaker. If you want to learn more about the DP wiring then Click on the below link.

How to wire a DP double pole circuit breaker?

Single Pole MCB breaker

In the above distribution board wiring diagram I wired 8 single pole breakers in which some are for low ampere (10A) and some are for high ampere or load which are 20A. If you want to learn about one pole breaker wiring then do click on the below post link.
How to wire one pole breaker?

Electrical Cables

For different loads, we use different types of electrical cables, and in every electrical project, we use the cable size regarding the load. For example for Air conditioner we use the 4 mm cable which is very good for this, however, if we use 2.5 mm then it's will not good for all time.
In the above diagram, I have shown the electrical cable with its size in mm in which are 6mm or 8mm, 4mm, 2.5mm, and 1.5mm electrical cables.

Electrical Connectors

The connectors did their duty very well in Electrical wiring, this the easy and compatible way of getting connections or joints in electrical wiring. My suggestion is that use always the connectors in the main distribution board wiring.

Earth Connection

The earth connection is very important in electrical wiring/ electrical technology. In the above diagram is shown earth symbol and I have shown how to do the wiring of earth or earthing. However soon I will write deeply about earthing.

Ampere Meter and CT Coil

The Ampere meter is very important in the distribution board because this device showed the total current (Ampere) getting the complete circuit or a load of the complete circuit. I have shown in the above diagram that how to wire an ammeter with CT current transformer, however, for better understanding visit the below link.

Volt meter / Voltage Meter

I also have shown the wiring of the voltmeter in the main D board. In the main D circuit breaker board, the voltmeter is a very important connection because this makes us know about the receiving voltage to the circuit. Also, read below.

Indicator Lights

This indicator makes the mainboard beautiful and easy to know about receiving electric supply if the mainboard supply starts the indicator shows the supply by a glowing bulb.


I spend a big time making this post and distribution board wiring diagram and it's just for you guys that you learn something clearly, but if I do hard working then it's your responsibility to make this site popular all over the world by following, Emile subscriptions, Likes and Shares.
INSHALLAH soon I will make distribution board wiring diagram for 3 phases and for different loads.

Sikandar Haidar

Electricalonline4u.com is a hub of electrical and electronics tutorials and easy diagrams.


  1. very good but can you explain that why we need to put 10amp 20 amp circuit breaker what is reason and if it is possible can you show us may be 1 or 2 rooms connection with the main board will be great full any way your teaching is very good and very clear to understand will be looking forward to see your next post regarding this Many Thanks

    1. Tanks dear, dear i shown 10 ampere circuit breaker for room load and 20 ampere circuit for room heavy load i.e AC, Heater etc.

  2. sir,
    what is the ct coil details, that is connected to the Amps meter.

    1. Dear CT mean current transformer which we use with ampere meter where the high current flow to circuit. In low current flow circuit we use those types of ampere meter which we connect in series but in high current flow circuit we use ct coil for ampere meter. but the current transformer and series connection ampere meter is different. you will learn all about current transform connection diagram by using below link.

  3. Hi, I bought 4p MCB . in your diagram the current flows from top to bottom, but here so many house they have connected bottom to top. Is it possible to flow from bottom to top.
    And what that in MCB 1-2 3-4 5-6

    1. Yes it is possible to flow form bottom to top. MCB breaker is like a one way switch. If you connect your incoming supply to top and get form bottom then it's working and if you connect the your power supply for bottom to top then it's also work same.

  4. Thank you...I cordially Appreciate your response.

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  6. Sir your work is very appreciate able. I've got too much benefit from it.

  7. Nicely explained dear. You deserve pat on your back. Keep it up!

  8. Total breakers load is 120 and your Main Breaker is 100 Why you use 120Amp For the main

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