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INA226 Negative and Positive voltages with common grounds

Other Parts Discussed in Thread: INA226

I've seen this thread but I'm still not confident on how to utilize two INA226 when the positive and negative rails share a common ground.  I want to monitor +/-28V.  Looking at the -48V Telecom example, it looks like the isolation would be removed byt the fact that the microcontroller ground, positive rail ground, and negative rail ground are all the same.