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Is the ground wire in the 220V power supply for the recorder inside the dashboard identical to the protective ground of the dashboard cabinet itself?

2016-05-26View Original

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For instruments such as recorders and digital displays that are powered by 220VAC and installed in the dashboard cabinet, their three power terminals (L, N, ground) are all connected to the 220V cable – does this constitute protective grounding? Then the enclosure itself is also given a protective ground connection – is this considered redundant? Is it okay to do this?

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