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Three phase earth bonding
Suppose I have a variety of equipment which is variously powered from one
of the phases of a three phase supply. I'm concered about the potential difference between two boxes on different phases. The boxes have low voltage electrical connections between them (similar to USB ports). Each box has a PC-style switching PSU. Leakage from the mains side into the DC side could cause a high potential difference between boxes on different phases, which would be enough to zap sensitive inputs on the interconnections. Suppose I connect the ground of the low voltage side of the PSU to that box's chassis, and then bond all the chassis together and join that to earth. Will that be sufficient to prevent any potential difference between phases arising that could cause trouble with sensitive inputs? Are there any issues this might cause (such as EMI, or tripping the RCD)? Is there a common way to detect automatically that this earth bond has come adrift (ie not by waitng for the annual PAT test)? I suppose checking for a voltage between ground and earth, or putting a voltage across them and checking the current hits some limit. But do people ever do this sort of thing? Thanks Theo |
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