
Instrumentation Cable
Some instrumentation cable standards are presented in Tables 10.18 and 10.19. One type of
instrumentation cable includes those covered in NEC Article 725, Class 1, Class 2, and Class 3
Remote-Control, Signaling, and Power-Limited Circuits. There are four main cable
designations or classes associated with that Article including:
1. Circuit integrity (CI) cable – is utilized to assure survivability and operation under fire
conditions for a remote control, signaling, or power-limited system critical circuit.
2. Class 1 Power-limited circuit cable (CL1) – is the wiri ng between th e load side
of an overcurrent pr ote cti on device