You need to make sure that the 30A stays in the power circuit and cannot flow through the uC circuit. You have the uC circuit and the power circuit then you make just the one connection between the two grounds. The 30A stays out of the uC circuit because there is no other route back to its power source.my power line has 400V and 30A . and making the power ground and controller common, is it compulsory to isolate??? if not isolated then what wil be the consequence?
I assumed that by power ground you meant the same as earth ground. Is that what you meant?
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