Electrician's Licensing Practice Exam

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Which method of making connections is suitable for bonding electrical systems?

Machine screw-type fasteners
Pressure connectors only
Twisted wires
Soldering

The correct answer is: Machine screw-type fasteners

Bonding electrical systems is crucial for ensuring safety and performance in electrical installations. The use of machine screw-type fasteners is particularly suitable for this purpose because they provide a secure and reliable connection that can withstand mechanical stress and environmental factors. This method ensures strong electrical conductivity and mechanical integrity, which are essential for effective bonding. Machine screw-type fasteners allow for easy disconnection and reconnection, facilitating maintenance and inspection while maintaining a strong bond. They also ensure that the connection can handle vibration and thermal expansion without loosening, significantly reducing the risk of connection failure over time. While other methods, such as soldering or twisted wires, may offer some level of connectivity, they typically do not match the reliability and durability found with machine screw-type fasteners when it comes to electrical bonding applications. For instance, soldering can weaken due to thermal cycling and may not provide adequate mechanical strength. Similarly, twisted wires may not be as reliable in high-stress environments where proper bonding is critical. Therefore, machine screw-type fasteners stand out as the best choice for bonding in electrical systems.