NCCER Electrical Module 3 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

NCCER Electrical Module 3 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified What is the purpose of insulation on electrical wiring? To prevent electrical current from escaping and protect against short circuits or shocks. Why is copper commonly used as a conductor in electrical wiring? It has high conductivity and is resistant to corrosion. How can you determine the size of a wire? By measuring its diameter or referring to the American Wire Gauge (AWG) system. Why is it important to use the correct size conduit for wiring? To ensure wires fit without being pinched or crowded, which could cause overheating. What is the function of a GFCI outlet? To shut off power if it detects a ground fault or current imbalance, preventing electrical shocks. 2 Why should you always de-energize a circuit before working on it? To eliminate the risk of electrical shock or injury. How can you test for voltage in a circuit? By using a multimeter or voltage tester. What is the difference between AC and DC current? AC current flows in alternating directions, while DC current flows in one direction. What is the purpose of a wire nut? To connect and insulate two or more wires securely. How do you identify a hot wire in a standard residential circuit? It is typically black or red in color. What does a single-pole switch control? It controls one circuit or device from a single location. 3 Why is it important to use wire rated for the correct amperage? Using the wrong wire could lead to overheating and fire hazards. What is the purpose of a junction box? To house electrical connections and protect them from damage. How do you determine the proper fuse size for a circuit? By matching the fuse rating to the circuit's amperage requirements. Why is it necessary to strip the insulation off wires before making connections? To expose the conductor for electrical contact. What is the purpose of a three-way switch? To control a single light or device from two different locations. How do you ensure a proper connection when installing a receptacle? Tighten the terminal screws securely and check for a snug fit.