NCCER ELECTRICAL LEVEL 3 MODULE 2 QUESTIONS AND ANSWERS | LATEST VERSION | 2024/2025 | CORRECT & VERIFIED

NCCER ELECTRICAL LEVEL 3 MODULE 2 QUESTIONS AND ANSWERS | LATEST VERSION | 2024/2025 | CORRECT & VERIFIED What is the first step when troubleshooting an electrical circuit? Turn off the power to the circuit before starting any work to ensure safety. What is the purpose of a circuit breaker in an electrical system? A circuit breaker prevents overheating and electrical fires by interrupting the flow of current when it exceeds safe levels. What is the difference between a single-pole and a double-pole circuit breaker? A single-pole breaker controls one circuit, while a double-pole breaker controls two circuits and provides 240 volts. Why should electrical conductors be sized according to the load they are carrying? Properly sized conductors prevent overheating and ensure safe operation of the electrical system. 2 What should be done before installing new electrical equipment? Ensure that the power is turned off, and verify the electrical system is de-energized to avoid accidents. What is the purpose of a fuse in an electrical system? A fuse protects the circuit by breaking the connection when the current exceeds a certain level, preventing damage to the system. How should electrical wiring be routed to ensure safety? Wiring should be routed in accordance with the National Electrical Code (NEC) to avoid hazards such as overheating, physical damage, or contact with water. What does NEC stand for, and why is it important in electrical installations? NEC stands for National Electrical Code, and it provides guidelines for safely installing electrical systems to protect people and property. What is the proper method for connecting electrical conductors? 3 Electrical conductors should be twisted together securely, and any connections should be insulated to prevent short circuits or electrical shock. How can you prevent electrical fires in residential wiring systems? Use the correct wire size, ensure connections are tight, and never overload circuits to prevent overheating and fire hazards. Why is it important to use the correct type of wire for specific applications? Using the correct wire ensures it can handle the required voltage and current, preventing overheating and ensuring the system's safety. What is the function of a ground fault circuit interrupter (GFCI)? A GFCI detects an imbalance between the hot and neutral wires and interrupts the power to prevent electric shock. How do you test a GFCI outlet? Press the "Test" button on the outlet, and then press the "Reset" button to ensure proper functioning. 4 What is a short circuit, and how does it affect an electrical system? A short circuit occurs when there is a direct connection between the hot and neutral wires, causing a sudden surge of current that can damage equipment and cause fires. What should be done if you find a damaged electrical cord? Immediately replace or repair the cord to prevent the risk of electrical shock or fire. What is the proper way to wire a three-way switch?