CCT CCT Electrical Systems & Wiring 2 ā Questions and Answers
Question 1: What does continuity testing of a Casper system's wiring harness verify?
- That insulation resistance is above 1 MĪ©
- That an unbroken electrical path exists between two points in the circuit (Correct answer)
- That the voltage at each terminal is correct
- That the wiring is correctly color-coded
Correct answer: That an unbroken electrical path exists between two points in the circuit
Continuity testing with an ohmmeter confirms that a complete, unbroken electrical path exists between two points, verifying that conductors are properly connected.
Question 2: A CCT technician measures 0.8 ohms resistance on a wire that should read less than 0.5 ohms. What is the most likely cause?
- The wire is too short
- A loose or corroded connection increasing resistance in the circuit (Correct answer)
- The meter leads are damaged
- The wire gauge is too large
Correct answer: A loose or corroded connection increasing resistance in the circuit
Resistance above specification typically indicates a loose terminal, corroded connection, or damaged conductor that increases resistance beyond acceptable limits.
Question 3: What is the function of a terminal block in a Casper system's electrical enclosure?
- To generate DC power for the system
- To provide a safe, organized connection point for multiple conductors without direct splicing (Correct answer)
- To filter high-frequency noise from power lines
- To store excess cable length
Correct answer: To provide a safe, organized connection point for multiple conductors without direct splicing
Terminal blocks provide organized, secure connection points for conductors entering or leaving an enclosure, improving safety, traceability, and ease of maintenance.
Question 4: When sizing a wire for a Casper system circuit, which two factors primarily determine the required conductor gauge?
- Wire color and conduit brand
- The current (ampacity) the wire must carry and the allowable voltage drop over its length (Correct answer)
- The ambient temperature only
- The conduit fill percentage and wire color
Correct answer: The current (ampacity) the wire must carry and the allowable voltage drop over its length
Wire sizing is governed by the ampacity required to carry the load current safely and the allowable voltage drop across the circuit's total length.
Question 5: Which instrument would a CCT technician use to measure insulation resistance of a Casper system's wiring to detect degraded insulation?
- Clamp meter
- Megohmmeter (Megger) (Correct answer)
- Oscilloscope
- Power quality analyzer
Correct answer: Megohmmeter (Megger)
A megohmmeter applies a high DC test voltage and measures the very high resistance of insulation, detecting degradation that could lead to ground faults or shock hazards.
Question 6: What is the purpose of using strain relief fittings where cables enter a Casper system's electrical enclosure?
- To increase wire ampacity
- To prevent mechanical stress on conductors and terminal connections caused by cable movement or pulling (Correct answer)
- To provide a weatherproof seal only
- To color-code the incoming cables
Correct answer: To prevent mechanical stress on conductors and terminal connections caused by cable movement or pulling
Strain relief fittings clamp the cable jacket to the enclosure fitting, transferring any pull force to the jacket rather than the conductors or terminal connections.
CCT CCT Electrical Systems & Wiring 2
What does continuity testing of a Casper system's wiring harness verify?