In the safety marking system, which color identifies switch and fuse box control panels and on/off boxes on machinery?

• A. Orange
• B. Blue
• C. Green
• D. Purple

Answer: (B)

Color coding in safety markings uses blue to flag the control interfaces on machinery—things you touch to operate power, such as switch boxes, fuse boxes, and on/off panels. This makes it quick and easy to locate where you start or stop equipment, or isolate power for maintenance, reducing the chance of accidental startup. The blue designation helps distinguish controls from other parts like guarding, emergency equipment, or warning hazards, which are marked in other colors. Other colors serve different purposes (for example, orange for hazards, green for safety equipment or safe conditions, purple for other specific categories), but blue specifically calls out the control elements you use to operate the machine.