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Answers Please. Electrical Technology.

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1. A load of 2.5kW takes a current of 12 Amp from a 230 Volt supply. Calculate the power factor.


2. Three single phase loads are to be connected to a three phase supply. All at unity power factor. The loads are,


i, 60 Amp.


ii, 50 Amp.


iii, 40 Amp.


By any method determine the neutral current.


Z.
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    Err yeees but, no , but ...

    I may have worked on a job where someone did something like that.  It might have been better if 2 of the 3 phases had been isolated prior to power being re-applied after the  fitting of the single phasing strap across the output terminals of the incoming switch.


    The element of shadenfreude as it was clearly not me was unavoidable. Still the electrons did make it very clear which fuses should have been pulled to do the isolation, with a sort of noise emitting diode effect ....

    M.
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  • 0
    Err yeees but, no , but ...

    I may have worked on a job where someone did something like that.  It might have been better if 2 of the 3 phases had been isolated prior to power being re-applied after the  fitting of the single phasing strap across the output terminals of the incoming switch.


    The element of shadenfreude as it was clearly not me was unavoidable. Still the electrons did make it very clear which fuses should have been pulled to do the isolation, with a sort of noise emitting diode effect ....

    M.
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