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How to Connect Portable Generator to Home Supply System (Three Methods)

How to Connect a Portable Generator to Home Supply System (Three Methods)

Hi folks! I am here with a new tutorial…Most of you sent me messages about the portable generator wiring diagrams in home. So I have prepared this article for you guys. Also, all these Electrical installation wiring diagrams useful in emergency i.e. in main power supply failure so you can restore electric supply by connect Portable Generator (Gas/Petrol/Diesel Generator) to home power supply system.
So now let’s begin.
We can connect Portable Generator to our home supply system by three methods.
Below are the details of each method. (Please read all cautions and care must be taken while installing a Generator to home Electric Power supply system.)
 
Important Note:
Electricity is Our Enemy, if you give it a chance to kill you… Remember…They will never miss it.
Please read all caution and instruction while doing this tutorial.
 
Method # 1
Connect Portable Generator to home power supply system
Generator Connection Diagram to Home Supply (With Separate MCB)
First of all, Switch off both the main Switches (MCB) of main power supply and the Second MCB where generator to be connected. Connect a Power inlet to the second MCB. Now connect the 3 pin power plug of Generator in that power inlet (As shown in below fig). You have done!
The Blue Line and arrow shows the power flow.
Click image to enlarge 

How to Connect Portable Generator to Home Supply System (Three Methods)

Operation and working
1.    In case of, when Power supply available from Power House
In this Case, the main electric power supplies electricity to home appliances and power flow will continue to those Electrical appliances this way by main power supply. And Generator remains standby.

The Blue Line and arrow shows the power flow.

Click image to enlargeHow to Connect Portable Generator to Home Supply System (Three Methods)
2.    In case of, when Power supply is not available from Power House
In this Case, Generator supplies electricity to home appliances and power flow will continue to those Electrical appliances this way by Generator (as shown in below image).
The Blue Line and arrow shows the power flow.
Click image to enlarge How to Connect Portable Generator to Home Supply System (Three Methods)
Please! Be Careful
Note:
In this Case, the first MCB (Main Switch which is connected to main power supply) would be “ON” and The Second MCB Switch (Which is connected to Generator) should be “OFF”.
Caution:
If the second MCB is “ON” in the above operation, i.e. Both MSBs switch ON the same time. Then;
  1. When Power restore, it may damage your generator or burn the whole system that can cause dangerous fire and explosion.
  2. When main electric supply not available, Generator will send electric supply back into main cable which may overload the generator and may give shock to electrician who work/repair in other homes and utility power lines
Method # 2
Connect Portable Generator to Home Supply system
Generator Connection Diagram to Home Supply with Change-Over Switch
To connect portable generator with home supply system, follow the steps below:
  1. Install a Change-Over switch (about 65A) near main distribution board in the home.
  2. Connect the main power supply to the one end of Change-Over Switch.
  3. Connect a 7.029 (or 4mm)” or 7.044” (or 6mm) flexible wire to the other end with Change-Over switch.
  4. Now connect a 3-pin power socket with flexible wire and install it near the generator onto the wall. Now put the generator 3-pin power plug into that socket which you have installed in step (4).
  5. You have done and ready to supply emergency electric power to the home appliances.
Click image to enlargegenerator connection with change over system to home supply
Method # 3
Connect Portable Generator to Home Supply System. Method #3
Connecting the Generator to the 3-Pin Power wall socket in home you have already installed
This is quite simple method to Connect Portable Generator to home power supply system and you can quickly restore electric supply (but dangerous one)
 
In case of power supply failure, just switch “off” the main switch and simply plug the Generator 3-pin plug into 3-Pin power inlet/ wall Socket which is already installed in home.
Click image to enlargegenerator connection with change over system to home supply
Operation and working
1.    In case of, when Power supply available from Power House
In this Case, the main electric power supplies electricity to home appliances and power flow will continue to those Electrical appliances this way by main power supply. And Generator remains standby.
The Blue Line and arrow shows the power flow 
Click image to enlarge How to Connect Portable Generator to Home Power Supply System
2.    In case of, when Power supply is not available from Power House
In this Case, Generator supplies electricity to home appliances and power flow will continue to those Electrical appliances this way by Generator (as shown in below image).
                                 The Blue Line and arrow shows the power flow.  
Click image to enlarge How to Connect a Portable Generator to Home Power Supply System
Please! Be Careful
Note:
In this Case, the first MCB (Main Switch which is connected to main power supply) would be “ON” and The Second MCB Switch (Which is connected to Generator) should be “OFF”.
Caution:
If the second MCB is “ON” in the above operation, i.e. Both MSBs switch ON the same time. Then;
  1. When Power restore, it may damage your generator or burn the whole system that can cause dangerous fire and explosion.
  2. When main electric supply not available, Generator will send electric supply back into main cable which may overload the generator and may give shock to electrician who work/repair in other homes and utility power line. if you don’t know the safety rules of electricity, then do not connect portable generator to home power supply system.
General Precaution
  • Disconnect the power source before servicing, repairing or installing electrical equipments.
  • Never try to work on electricity without proper guidance and care
  • Work with electricity only in presence of those persons who has good knowledge and practical work to deal with electricity
  • Read all instruction and cautions and follow them strictly.
  • The author will not be liable for any losses, injuries, or damages from the display or use of this information or try any circuit in wrong format so please! Be careful because it’s all about electricity and electricity is too dangerous

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15 comments

  1. nice post sharing information related to electric supply

  2. The only one that's legal is the one with a change over switch. All others are illegal in the U.S. by OSHA

  3. Read the Description as will as cautions. Thanks

  4. The second method which uses change over switch is safer than methods 1 and 3. Thank you<br />for the information.

  5. Thanks for sharing useful information.

  6. A.O.A.
    Q1.Why inductors are not fabricated in the IC?
    Q2.P=VI=V^2/R=I^2R
    On what occasion,these formulas are used?

  7. This is so good , thank

  8. All of these diagrams are dangerous and illegal and shouldn’t be published here. No one should ever connect a generator to the house in these ways. The only way is to use a changeover switch so that the mains is isolated whilst the generator is in use and visa versa. In other words, the switchboard is connected to the common side of the changeover switch and the mains connected to the input 1 and the generator to the input 2.

    • i totally agree with Alan the way to go is either a auto change over or a mechanical change over either way it is no possible to have both supplies on at once

  9. alan u are 100% correct

  10. please sir how can one make interswich connection between solar, generator and grid supply for residential use

  11. Method 2 is almost right but there should be no wiring or connections to the top MCB’s.
    The mains power should come into the top of the changeover switch only and no wiring to anywhere else.
    Basicly you are interupting the mains power to the MCB’s by the changeover switch, when you switch it over, the power will flow from the generator to the MCB’s. Only one set of MCB’s is needed.
    In Australia, if you published or told a non qualified person how to wire up electrical equipment like this, you could be prosecuted if they were injured. Please remove all other methods, there is only one method, the manual or automatic changeover swith.

  12. I use 2 high power relays switching both L and N and have it so they are wired to automatically switch power source. This is wired with delay timers in the circuit to ensure clear separation of power supply when changing over and prevent accidentally making the Mains line live. You don’t want to kill the electrician working down line trying to fix the reason for the power cut in the first place. If you are going to have it manually switched you need to consider making it physically impossible to have both on.

    • Tim, you don’t need a delay you need to electrically interlock each relay coil with each other so only one can energise as well as mechanicaly interlocking them so it is impossible to energise both.
      They do fail and I have worked on cranes with forward reverse contactors for years (relays) they do stick and jam on sometimes. Mechanical interlocks prevent this happening. The better way is to get a changeover contactor which is energised with the mains on with 2 normaly open contact and 2 normaly closed contacts. When the power fails, it drops out and the auxillary input is connected.

  13. thank you brother you are giving very best information about electricity.

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