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Isolating transformer help

MrJack96
fbfff694442d96ab55a4ca1cf11d99ce-huge-2f44b3c6-e82b-49a0-b1bd-1df87196400c.jpg36db8eb65df624d194c4f0d38bc9d37e-huge-858d560a-6a7b-4127-9383-db090315f918.jpg5829e0bca8ccbe2f8ca57ff4780fc9b2-huge-19d0edbf-ea01-407a-9fc4-6ac2c9c6ba51.jpgHi guys I have seen an isolating transformer feeding a single phase pump on site and am unsure if it should be isolated. I can see they have tied the 0v on the 110v side to earth just not the 240v Can anyone give me some advice. Here are some pictures. 


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    500 volts is probably for use in America. Large or industrial buildings often have a three phase, 4 wire supply at 277/480 volts.

    Various countries use three phase, three wire systems with 500 or 550 volts between phases.


    It looks to me as though the transformer pictured is intended for mains input on the bottom terminals, with taps for numerous different voltages.


    I think that the output is intended to be from the top terminals, via two independent windings.


    I think that it has been wired other than as intended, with UK mains supply connected to the 240 volt output winding, and the 110 volt load connected to the 110 volt output winding.

    No reason this should not work, and it presumably DOES work. But not being used as intended. The capacity of the transformer MIGHT be reduced by connecting thus.
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  • 0
    500 volts is probably for use in America. Large or industrial buildings often have a three phase, 4 wire supply at 277/480 volts.

    Various countries use three phase, three wire systems with 500 or 550 volts between phases.


    It looks to me as though the transformer pictured is intended for mains input on the bottom terminals, with taps for numerous different voltages.


    I think that the output is intended to be from the top terminals, via two independent windings.


    I think that it has been wired other than as intended, with UK mains supply connected to the 240 volt output winding, and the 110 volt load connected to the 110 volt output winding.

    No reason this should not work, and it presumably DOES work. But not being used as intended. The capacity of the transformer MIGHT be reduced by connecting thus.
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