When may high-voltage cables be marked in colors other than orange?

• A. In all cases
• B. During normal operation
• C. When they are within electrical protection barriers
• D. If battery is removed

Answer: (C)

High-voltage cables are normally orange to warn of dangerous energy and help people quickly identify parts that could cause electric shock. But when those cables are placed inside electrical protection barriers, the risk to bystanders is controlled by the barrier itself. In that protected context, other color markings may be used to align with the equipment’s internal labeling or standards, since access to the live components is restricted anyway. The key idea is that the barrier changes how the marking is conveyed; outside of the barrier, the orange warning remains important. The color marking isn’t tied to the system’s current state (like whether the battery is removed or not) but to the exposure risk and the presence of protective containment.