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Wiring of the Distribution Board with RCD (Single Phase Home Supply)

Wiring of the Distribution Board with RCD , Single Phase, 

(from Energy Meter to the main Distribution Board) Fuse Board Connection.

Main Distribution Board or Fuse Boards

Main Distribution Board or Fuse Boards ( Consumer Unit) usually contains three main units.
They are as follow:

  1. DP = Double Pole MCB  (The main switch)
  2. RCD (Also DP) Residual Current Devices.
  3. SP = Single Pole MCB ( Circuit Breakers and Fuses)

it is used to control and distribute electric supply (safely to electrical appliances) around your home. The following diagram is showing single phase wiring of distribution board with RCD. More details of each sections are below the fig.

Click Image to enlarge

Wiring of the Distribution Board with RCD , Single Phase, (from Energy Meter to the main Distribution Board) Fuse Board Connection.

1) DP = Double Pole MCB  (The main switch)

This allows you to turn off and on the electric supply to your home because this is the main operating switch to control electric supply. remember that immediately switch off the main switch in emergency i.e. in electric shock, fire or  while working on main board. You can use also multiple mains switch if you has more supply unit i.e storage heater etc. so then use a separate Fuse board.

2)  RCD (Also DP) Residual Current Devices.

A (RCD) residual-current device, or (RCCB) residual-current circuit breaker , is an electrical wiring device or switch that disconnects or trip a circuit whenever it detects that the electric current is not balanced between the energized conductor and the return neutral conductor. And then instantly disconnect the electricity (in dangerous conditions). 

3) Circuit Breakers

Circuit breaker is a device which switch off and on electric supply at normal ( and abnormal) condition). These are automatic protection devices in the Main switch board or fuse-box that switch off a circuit if they detect a fault. the size of the fuse and Circuit Breaker are similar, but it give more and more protection. You can reset it again if the trip ever.

Also check this:
Wiring of the distribution board , Single phase, from Energy meter to the main distribution board (Without RCD = Residual Current Devices). 

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  1. hdmfhdf-[kj<br />t

  2. It is hard to understand electrical distribution if you dont have background.

    • Does it matter Witch side you put the live and neutral on the underside of the incoming rcd I’ve seen it on the right hand side is that ok

  3. anyway my man ,i think the diagram z well designed to understand

  4. it good..

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  10. You can connect the sub-circuit or final sub circuit to the out put of SP (Single Pole) Circuit breaker.. in other words, click on image and check the SP&#39;s breakers outputs (1-8)… you can see the mentioned title as &quot;Live Wires or Phase Supply to the Sub Circuits or Final Sub circuits&quot;.

  11. Can anybody advise me The wiring diagram of USB socket for house wiring.

  12. can you please tell me in this wiring diagram, should we connect earth bus bar with neutral bus bar? i have seen this connection often. is this configuration is correct?

  13. Hi there
    Am looking for wiring diagram for single phase without RCD CONNECTION FROM ENERGY METRE PLS PROVIDE ONE FOR ME

  14. http://s304.photobucket.com/user/jrda328/media/Join_zpsmufavywv.jpg.html
    Hi, I need to check with you guys if the edited image on the attached pic is possible to do.
    This is for the purpose of optimizing my home plug speed, since the Router is connected on a different circuit (Living Room) from my Bedroom circuit.

  15. I would like to installed a RCCB at the main consumer line distribution box where the other lines outs. so which is better it installed RCCB or RCBO.

  16. perfect and clear design, I want to draw my own, would be soo nice of you to advise me about the tools you used to draw this wiring, it is very easy to understand.

  17. `13860 watts of power consumption ? Isn’t it too much of power consumption ?
    As it is single phase so I assume minimum 220 volts supply.
    Main MCB is of 63AMP ! So total power consumption limit is 13860!
    Isn’t is too high ?
    Very confused am, because I think total consumption load in India on a single phase connection allowed is 7500 watt max. So the main MCB should be a 30AMP one.
    Please enlighten me.

      so 13860watts = 13860/220volts=63 amps.
      Also 7500Watts/220=34.09Amps. So the main MCB should be double that figure.

  18. Very good explanation

  19. How to calculate the rating of mcb,red and numbers of such devices in a building.
    Also explain with the diagram how to control different loads my each mcb.

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