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Thread: P2 change over switch diagram pg344 Sans10142-1:2020 edition 3

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    P2 change over switch diagram pg344 Sans10142-1:2020 edition 3

    Hi

    Who actually installs a change over switch as per P2 change over switch diagram pg344 Sans10142-1:2020 edition 3.
    I never come across a installation like the diagram.
    I usually find the change over switch installed below the mains above the earth leakage.

    So my question is this legal? As far as i can see it still provides all the necessary protection.

    your thoughts?

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    I have installed very similar as to the SANS drawing, I did not realize it until I had a closer look, only difference on mine is, an extra changeover switch for a third section called : Non-essential. Thereby I have three split neutrals with three earth leakages.
    1.- Normal section for Eskom only-geyser, dishwasher, stove etc. (no battery backup)
    2.- Non-essential for tv’s, kettle, fridges and all small power plugs (battery backup option if battery capacity is ok, these are load-shed if battery’s are running low)
    3.- Essential for CCTV, Alarms, gate motor, Wifi, lights, 1xTV only (Always on backup)
    Very few people wire their DB’s this way but I find it very convenient and it functions very well.
    Regards Rifrug

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    The only unclear part is the earthing, SANS show the bonding of alternate supply earth and consumers earth. They do not show a earth spike which I would think is necessarily if you were taught that all conductors should originate from the same point. That would mean creating a alternative earth with a good earth resistance as close as possible to the generator or solar inverter and not relying on a utility earth that might be hundreds of meters away. Please correct me if I’m not seeing something as I’m always learning something.

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    Quote Originally Posted by melvinbrucepaton View Post
    It is exactly the same as page 359 SANS 10142-1:2017 edition 2
    Comments are based on opinion...not always facts....that's why people use an alias.

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