Grounding Complications is a very informative 28 slide set from PowerCET. It worth to read for everybody working with ground loops and electrical wiring. The slide set concentrates on following issues: Sensitive Equipment, Isolated grounding and Supplemental grounds. The slide set tells about wiring practices in use in USA, but there are also general information that is useful also to readers outside USA. Read the measurement tips on the end. They can be very useful when you next time need to troubleshoot grounding related problems.