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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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    seconded, but note that on double insulated kit the earth pin is only there as a location feature, indeed it is sometimes plastic, so it may not matter. However, it is a very bad idea. If you need to have an earth free supply sockets fed by isolation transformer is a better way, but normally just looking a the layout of the mains wiring and the screens on audio cables allows you to see where the one turn transformer is, and to re-lay it to have zero area, these days mains frequency hum is as likley to be an RF pick up problem from and SPMPS or dimmer bank generating fast edged pules at a high frequency that is modulated at 50 or 100 Hz. In whcih case proper filtering is the solution.
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  • 0
    seconded, but note that on double insulated kit the earth pin is only there as a location feature, indeed it is sometimes plastic, so it may not matter. However, it is a very bad idea. If you need to have an earth free supply sockets fed by isolation transformer is a better way, but normally just looking a the layout of the mains wiring and the screens on audio cables allows you to see where the one turn transformer is, and to re-lay it to have zero area, these days mains frequency hum is as likley to be an RF pick up problem from and SPMPS or dimmer bank generating fast edged pules at a high frequency that is modulated at 50 or 100 Hz. In whcih case proper filtering is the solution.
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