In older resi occupancies, we often find loooooong #14 runs with voltage drop well in excess of code recommendations. In the course of analyzing the existing circuits, this tool has been worth it's weight in gold (even at today's prices).
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It's primarily a "line load simulator" which lets us check voltage drop (as VAC and %) under known loads (10A, 15A & 20A) at any outlet. Since the tool also incorporates a GFCI Test function, the "dangerous" reference to GFCI testers used on "2-wire circuits" in the NEMA slideshow provided by 480sparky caught my attention. My question upthread was posted in the hope that someone would have some insight as to why NEMA might have made this statement. Any thoughts will be appreciated.
