- **Meaning**: The green shell usually **mandatorily indicates the grounding function** and is used for **grounding terminal boxes ** or **distribution boxes with grounding busbars**. The Electrical Appliances (Color Code) Regulations 1969 came into effect on 1 July 1969. This regulation ensured that a set of rules and an industrial color code pattern must be followed worldwide. Wiring Color Codes in Europe (IEC) for AC Supply Wiring Color Codes in Europe (IEC) for DC Supply Is this faq. The IEC 60446 standard, "Basic and Safety Principles for Man-Machine Interface, Marking, and Identification," establishes global guidelines for identifying electrical equipment terminals, conductors, and wiring colors. The standard colors used for electrical wires in most homes are black, red, blue, yellow, white, gray, green, and sometimes bare copper wires.
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