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IAEI Magazine | Author: Noel Williams
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Noel Williams

Noel Williams is a consultant specializing in electrical code requirements. He managed two electrical contracting firms and supervised electrical construction projects in the western states for over 25 years. He has taught electrical classes and seminars for over 20 years throughout the United States and is an approved instructor for continuing education for electricians in numerous states. He is a licensed electrical inspector and master electrician. Noel is author of NFPA's Limited Energy Systems, and coauthor of the NFPA/IAEI Electrical Inspection Manual, and NFPA's NEC Q and A books. He has been an active member of the IAEI Utah Chapter for over 25 years, and is a member of their executive board.


Signaling Systems

Article 725 in the NEC covers signaling systems and remote control systems. These types of systems are not always easily distinguished from each other because applications of signaling and remote control circuits tend to overlap. In fact, some systems or circuits often perform both functions. For this reason, the rules in Article 725 and the application of those rules are based on circuit classifications rather than precise functions.