You are supervising a new electrician concerning an onboard test of an electrical component using a test rig with flexible cable. The electrician is unsure of the cable conductor color coding. Which of the color coded insulated conductors can only serve as an equipment safety ground and shall not be used as a current carrying conductor?

Correct Answer: Option C — A conductor with green insulation (or green with one or more yellow stripes) would be used for this purpose.

Per IEEE 45 and 46 CFR standards, green or green with yellow stripes is exclusively reserved for equipment grounding conductors. Using this color for current-carrying conductors is strictly prohibited to prevent confusion, ensuring that maintenance personnel can safely identify the safety ground and avoid hazardous electrical shock during equipment testing.