When maintaining low-voltage systems, there is little to guide you as to when to schedule service, other than your experience with the equipment’s past performance and the recommendations of the manufacturer. Or, maybe, you focus on providing on-call service only.
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC), Jim will help you solve it. Questions can be sent to email@example.com. Answers are based on the 2014 NEC. Previous use of gray conductors