NCCER Electrical Module 2 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

NCCER Electrical Module 2 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified What should you always do before working on any electrical system? Turn off the power and verify it’s off using a voltage tester. Why is it essential to use insulated tools when working with electrical circuits? Insulated tools prevent accidental electrical shock by isolating the worker from live parts. What is the primary role of a fuse in an electrical circuit? A fuse breaks the circuit if the current exceeds safe levels, protecting the wiring and devices from damage. How can you determine if an electrical circuit is overloaded? An overloaded circuit will cause the circuit breaker to trip or the fuse to blow, indicating excessive current flow. What is the purpose of a junction box in electrical wiring? 2 A junction box protects electrical connections and prevents fire hazards by containing any potential sparks or heat. Why should you avoid using extension cords as a permanent wiring solution? Extension cords are designed for temporary use; using them permanently can cause overheating and increased risk of fires. What is the danger of using faulty or damaged electrical equipment? Faulty or damaged equipment can cause electrical shock, fire hazards, or electrocution if not properly repaired. What is the recommended way to store electrical cords when not in use? Coil electrical cords loosely and store them in a dry, safe location to prevent damage and avoid tripping hazards. How do you test for ground faults? Use a ground fault circuit interrupter (GFCI) tester or a multimeter to check if the grounding system is functioning correctly. 3 What is the function of an RCD (Residual Current Device)? An RCD detects and disconnects the power supply when there is a leakage of current, preventing electric shock. Why is it unsafe to overload power strips? Overloading power strips can lead to overheating, fires, and damage to connected devices. What should you do if you see sparks coming from an electrical outlet? Immediately disconnect the power, unplug devices, and call an electrician to inspect the outlet for faults. Why should you never mix water and electricity? Water is a conductor, and mixing it with electricity increases the risk of electrical shock and can be deadly. What is the purpose of arc fault circuit interrupters (AFCIs)? AFCIs detect and stop arc faults in wiring, preventing potential electrical fires caused by sparking. 4 Why is it important to have proper lighting when working on electrical systems? Adequate lighting ensures you can clearly see wiring and components, reducing the risk of errors and accidents. How do you calculate the total current of a parallel circuit? In a parallel circuit, the total current is the sum of the currents through each parallel branch. What should you do if you encounter a damaged electrical wire during installation? Immediately stop work, turn off the power, and replace or repair the damaged wire before proceeding. What is the role of a transformer in an electrical system? A transformer adjusts the voltage levels to ensure safe and efficient power distribution over long distances. What are the risks of working with electricity in damp or wet environments? Wet conditions increase the risk of electrical shock, as water can conduct electricity, causing severe injury or death.