What do WHITE wires with BLUE STRIPES signify?

• A. AC grounded conductor
• B. Equipment grounding conductor
• C. DC grounded conductors
• D. Externally powered conductor

Answer: (C)

The main idea is using color and markings to identify a conductor’s role, especially in DC systems. A white insulated conductor with a blue stripe is used to mark a DC grounded conductor—the negative or return path that is connected to the system ground. This marking helps distinguish it from other DC conductors (like the positive) and from the equipment grounding conductor.

In practice, a neutral or grounded conductor in AC typically uses white without a stripe, and equipment grounding conductors are green or bare. The blue stripe on white isn’t a general rule for those cases, so the striped white specifically signals the DC grounded conductor, clarifying its function in the circuit.