Electrician's Licensing Practice Exam

What finish must the screw for a main bonding jumper or system bonding jumper have?

1. Red finish

2. Blue finish

3. Green finish

4. Black finish

The correct answer is: Green finish

The screw for a main bonding jumper or system bonding jumper must have a green finish. This is in accordance with electrical codes and standards, which designate green as the color to identify equipment grounding conductors and bonding jumpers. The green finish serves as a visual indication that these components are associated with grounding and bonding, which are crucial for safety in electrical installations. In the context of electrical work, a main bonding jumper or system bonding jumper is essential for establishing a low-resistance path back to the source in case of a fault, thereby ensuring that electrical systems operate safely and effectively. The color-coded finishes help electricians quickly identify the purpose of specific components, promoting proper installation and maintenance practices. Other color finishes, such as red, blue, and black, may be used for different types of conductors or applications but do not signify the grounding or bonding role required for these jumpers. This distinction is vital in maintaining consistent safety standards across electrical systems.