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  • How to determine Minimum power rating?

    Certain appliances have a higher start-up rating than the normal operating rating. You should therefore take this into account when making your  generator choice.
    To calculate the power you need at start-up, apply the multiplier coefficient provided, for information purposes only, in the below table.
    To find out the minimum capacity of your appliances, refer to the manufacturer’s technical documentation.

    Equipment with small motors: coefficient 1.2
    Equipment with large motors: coefficient 3.5

    Resistive devices: coefficient 1

    Vacuum cleaner1.2
    Forced air heating2
    Cement mixer3.5
    Air conditioning unit3.5
    Furnace (mobile)1.2
    Plastering machine3.5
    Grinder ( hand)1.2
    Mini display cooler3.5
    High-pressure washer3.5
    Drill ( hand )1.2
    Drill / breaker3.5
    Belt sander1.2
    Refrigerator and freezer3.5
    Circular saw3.5
    jigsaw ( hand)1.2
    Water pump3.5

    Example: to power a 1000W grinder, you will need a generating set of 1500W (1.000W x 1.2)

    What is an Automatic Transfer Switch (ATS)?

    It is the brains behind the system.
    An ATS monitors the utility voltage, senses utility failure, starts and runs the generator, switches the electric load from utility to the generator.
    Senses the return of utility power, switches the load back to utility and finally, after a short cool down period, turns off the generator.
    An ATS is sized in volts and amps and is matched to the generator and the utility service.

    How ATS works?

    The Automatic Transfer Switch (ATS) constantly monitors the utility power.
    If there is an interruption in utility service, the ATS disconnects the utility service from the distribution panel and starts the generator.

    When mains power fails the ATS will pause for a set period (determined at set up by the engineer) to ensure you haven’t had a power spike.

    Once the generator is producing power the ATS connects the generator to the distribution panel.
    The standby generator is providing power to the distribution panel. This process takes from 10-20 seconds.

    When the ATS senses that utility service is properly restored, it disconnects the generator from the distribution panel and reconnects the utility service.
    After transferring back to utility service the generator goes through a cool down period of about 10-15 minutes, then shuts down.
    The system is back in standby, ready to respond to the next power failure.


    This insures that the system is indeed stand-by ready for the next time it is called on to power-up in the event of a utility failure.

    How to connect ATS to Service Panelboard?

    Installing your transfer switch ahead of your main breaker is relatively simple.

    However minimal changes to your existing wiring may be required while making the installation.

    Because of the complexities of some type of mianboards & wiring your transfer switch this way, it’s STRONGLY suggested hire a licensed electrical contractor to make the installation.





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