What color is the bonding screw at the main panel?

The bonding screw at the main panel is green. The green color signifies that it is specifically intended for grounding purposes. This screw is used to bond the equipment grounding conductors and the metal enclosure of the panel to ensure a safe and effective ground connection. Proper grounding is essential in electrical systems to prevent shock hazards and to ensure that overcurrent protection devices operate correctly during faults.

While the other colors can represent different wires or conductors, they do not designate the specific function of bonding within the electrical panel. For example, black and red are typically associated with hot wires, while blue might indicate a traveler wire in multi-way switch setups. Understanding the function and color coding of electrical components is crucial for safety and compliance with electrical codes.