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Earth pin missing

lyledunn
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I noted several of these connecting audio visual equipment below a control desk in a large church complex. You can see that the earth pin has been deliberately removed. Must have been done before the date on the PAT stickers! Anyway, I know some of these audio guys have strange perceptions and I am wondering was the earth pin removed to avoid interference.
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    Sparkingchip:

    How likely is it the earth pin actually provided an earth connection?


    Would it have provided any function other than opening the shutters for the live and neutral pins?


    Andy b.




    Depending on the design of the PSU, it might have connected the 0V of the DC output to mains earth to provide a reference. I agree that its not 'earth' in the sense of CPC or connecting metal work to earth for the purposes of shock  protection. That's not the 'problem'. The problem is the referencing of the output side of the PSU and hence the outer of any phono connectors or the like to mains earth.


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  • 0
    Sparkingchip:

    How likely is it the earth pin actually provided an earth connection?


    Would it have provided any function other than opening the shutters for the live and neutral pins?


    Andy b.




    Depending on the design of the PSU, it might have connected the 0V of the DC output to mains earth to provide a reference. I agree that its not 'earth' in the sense of CPC or connecting metal work to earth for the purposes of shock  protection. That's not the 'problem'. The problem is the referencing of the output side of the PSU and hence the outer of any phono connectors or the like to mains earth.


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