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IEEE offers a "Redline" PDF for 80-2013. This shows deleted text (strikethrough) and new text (red underline) compared to the 2000 edition. This is invaluable for engineers migrating older designs.

The document’s primary goal is to prevent fatal electric shock under fault conditions. It distinguishes between:

It is vital to understand that is a guide ; however, it is recognized as the "State of the Art" by regulatory bodies.

Imagine you are designing a 138kV substation with a 20kA symmetrical fault current for 0.5 seconds. Using :