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Single phase max load

Hi I know that in a normal house the single phase supply is rated at 100 amps max as far as I know there aren't any bigger than this but are there larger single phase supply's for commercial use? 

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  • That is PROBABLY fine, but a lot depends on how exactly the 95 amp figure was obtained.

    If it was measured at 95 amps, then I might be a bit doubtful. It would only take one portable heater to produce a slight overload, two heaters and a tumble dryer to produce a significant overload.

    If the 95 amps was the maximum recorded by a data logger over a reasonable time, then it depends. A typical loading of say 60 amps and a brief peak of 95 amps will almost certainly  be fine. If the load was at 95 amps for hours at a time then that is a bit worrying as even a small long term increase could end badly.

    If the 95 amps was calculated by simple addition of appliance ratings, then almost certainly fine as the actual load will almost certainly be a lot less.

    If the 95 amps was calculated in the usual way after diversity, then probably OK unless unusually intensive use of large loading appliances. is expected.

    There is a huge difference between an electric shower that uses 40 amps for a few minutes and an industrial machine that uses 40 amps for hours at a time.

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  • That is PROBABLY fine, but a lot depends on how exactly the 95 amp figure was obtained.

    If it was measured at 95 amps, then I might be a bit doubtful. It would only take one portable heater to produce a slight overload, two heaters and a tumble dryer to produce a significant overload.

    If the 95 amps was the maximum recorded by a data logger over a reasonable time, then it depends. A typical loading of say 60 amps and a brief peak of 95 amps will almost certainly  be fine. If the load was at 95 amps for hours at a time then that is a bit worrying as even a small long term increase could end badly.

    If the 95 amps was calculated by simple addition of appliance ratings, then almost certainly fine as the actual load will almost certainly be a lot less.

    If the 95 amps was calculated in the usual way after diversity, then probably OK unless unusually intensive use of large loading appliances. is expected.

    There is a huge difference between an electric shower that uses 40 amps for a few minutes and an industrial machine that uses 40 amps for hours at a time.

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