Section 110.3(B) states, “listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.” The inspector recognized the replacement of the ungrounded receptacle with a GFCI receptacle as NEC-compliant but stated the installation instructions required connection to a grounding-type receptacle and cited noncompliance with 110.3(B), since installation instructions must be followed as part of the listing of the electrical equipment. The electrical contractor removed the old ungrounded receptacle and replaced it with a ground-fault circuit interrupter (GFCI) receptacle in accordance with 406.4(D)(2)(b) in the 2011 NEC. The problem for the installation-raised by the electrical inspector-was that all of the receptacles at the particular site were ungrounded and had been installed in accordance with the NEC at the time of installation, (in other words, prior to the 1956 NEC). The question involved cord-and-plug-connected equipment where the manufacturer of the electrical equipment stated in the installation instructions that it must be connected through a grounding-type receptacle. Prior to the 1956 NEC, receptacles were 2 wire (an ungrounded or “hot” conductor and a grounded or “neutral” conductor) without equipment grounding conductor connection, thus requiring no ground pin on the cord cap. This past week, I received an email question where the origin of the NEC material requiring an equipment grounding conductor and a grounding-type receptacle was from the 1956–1962 era of the NEC, but the answer involved installations in 2013. I also have the NEC handbooks back to 1913 and the regular NEC to about 1920, but very few questions have answers that date back to that era. Some questions take more time and involve a search through my library in which I have proposals, comments, preprints, and other historical background to the 1943 era. I can answer some of these questions very easily without much controversy by a simple reference to the National Electrical Code (NEC). Many of the articles that I write for this magazine originate as questions that I receive as I travel, by phone, or come to me as emails.
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