There is a claim that some of the diagrams are incorrect and that if a homeowner wired according to those diagrams there is a potential for electrical shock. According to one
commenter:
On page 188, in the left-hand side diagram headed “Wiring a GFCI Receptacle with Both Protected and Unprotected Cables,” the label, “To unprotected receptacles downstream” should read “To protected receptacles downstream.” Likewise, “To protected receptacles downstream” should read “To unprotected receptacles downstream.” The label “ground” points to the neutral wire, instead of the bare wire ground. In the right-hand side diagram headed “Wiring a Single GFCI Receptacle,” the labels for “neutral” and “ground” are reversed.
For some reason a book with faulty instructions makes me want to run out and buy it.