What is the correct color to use for an intrinsically safe conductor?

• A. Orange
• B. Light blue
• C. Yellow
• D. Pink

Answer: (B)

The main idea is to identify circuits that are energy-limited and designed to prevent ignition in hazardous environments. Intrinsically safe conductors are colored blue (specifically light blue) so you can quickly recognize them and handle them accordingly during installation, testing, and maintenance. This blue coloring helps distinguish these circuits from ordinary power or control wiring, reducing the risk of applying excess energy that could ignite a flammable atmosphere.

Other colors aren’t the standard way to mark intrinsically safe conductors, so they wouldn’t reliably signal the IS status.