CSLB Class B General Contractor's License Practice Exam

What type of wire is commonly connected to the ground in electrical systems?

1. Black wire

2. Red wire

3. Green wire

4. White wire

The correct answer is: Green wire

The green wire is commonly connected to the ground in electrical systems. In wiring conventions, the green wire is specifically designated for ground connections, serving as a safety measure to prevent electrical shock and fire hazards. Ground wires are used to direct electrical currents safely into the ground in case of faults or surges, effectively providing a path for excess electricity to flow away from the system. The importance of using a specific color for ground connections lies in the need for clear identification within the electrical system. This standardization helps electricians and individuals working on electrical projects to easily identify the function of each wire, ensuring proper installation, maintenance, and safety procedures are followed. This is vital in both residential and commercial buildings to ensure compliance with electrical codes and standards. In contrast, black and red wires typically serve as hot wires, carrying electricity from the power source, while the white wire is usually used for neutral connections, completing the electrical circuit. Understanding these color codes and their respective functions is crucial for anyone working within the field of electrical contracting.