Red Seal Construction Electrician Practice Exam

How can overloads in a circuit be prevented?

1. By using longer circuits

2. By ensuring circuit breakers are properly rated for the load

3. By installing additional outlets

4. By using outdated wiring methods

The correct answer is: By ensuring circuit breakers are properly rated for the load

Preventing overloads in a circuit is primarily achieved by ensuring that circuit breakers are properly rated for the load they are intended to protect. Circuit breakers are designed to automatically trip and interrupt the flow of electricity when they detect a current exceeding their rated capacity. This action helps protect the wiring and prevent overheating, which can lead to electrical fires. When a circuit breaker is correctly rated, it matches the current that the circuit can safely carry. If you were to use a breaker with a rating too high for the circuit, it would not trip during an overload, leaving the circuit vulnerable to damage and potential fire hazards. Therefore, proper breaker rating is crucial to ensure the safety and functionality of the electrical system. The other options do not effectively prevent overloads. Using longer circuits may increase resistance, but it does not address the fundamental issue of current capacity and can lead to reduced voltage at the load. Installing additional outlets can result in an increased number of devices connected to the circuit, potentially resulting in overload if not considered alongside the circuit's capacity. Lastly, using outdated wiring methods can create safety issues and may not adhere to current codes designed to prevent overload situations.