A Step-by-Step Guide to Reading Power Status via the Four-Color Lights in Civil Distribution Boxes Check the box's label first. If not, use this standard: Red: Fault/alarm. Steady = major fault (short circuit/overload); blinking = minor (loose connection). IEC does not mandate a single required color for distribution panel indicator lights, but standards provide guidance through EN 60204-1:2018 (Safety of machinery - Electrical equipment) and IEC 60417 (Graphical symbols for use on equipment). Green is universally associated with safety, nature, growth, and the "go" signal of traffic lights. Meaning: A green light means the motor is running, the process is active, and the operation is normal. Danger or alarm, abnormal condition requiring immediate attention. Indication that a protective device has stopped the machine, e. (the color RED for the emergency stop.
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