CCT Electrical Systems & Wiring Flashcards
6 cards from real CCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CCT Electrical Systems & Wiring flashcards as text
In a Casper system using 24 V DC control wiring alongside 120 V AC power wiring, what is the NEC-required practice to prevent interference and hazards?
Answer: Separate Class 2 (low-voltage) control wiring from power conductors in different raceways or maintain NEC-specified separation
NEC Article 725 requires Class 2 low-voltage control conductors to be separated from power conductors to prevent induced voltages and shock hazards.
A Casper system's circuit breaker trips repeatedly under normal load. Which condition most likely explains this behavior?
Answer: The breaker is faulty, there is a partial ground fault, or the load exceeds the breaker rating
Repeated tripping under normal load indicates either a defective breaker, a partial ground fault drawing extra current, or an actual load that exceeds the breaker's rating.
What does a wiring diagram (schematic) used during Casper system installation primarily show?
Answer: The electrical connections, component symbols, and circuit paths within the system
A wiring schematic uses standardized symbols to show electrical connections and circuit paths, enabling technicians to trace circuits and verify correct wiring.
Which wire termination method provides the most reliable, vibration-resistant connection in a Casper system subject to mechanical vibration?
Answer: Crimped ring or fork terminal with the correct crimp tool
Properly crimped ring or fork terminals create a gas-tight mechanical connection that resists loosening from vibration far better than other field-termination methods.
Why is it important to verify polarity when connecting DC power to a Casper system control board?
Answer: Connecting DC with reversed polarity can immediately damage or destroy polarity-sensitive components such as ICs, diodes, and capacitors
Many DC components including ICs, electrolytic capacitors, and diodes are polarity-sensitive and will be instantly damaged or destroyed if connected with reversed DC polarity.
What is the correct procedure after completing new wiring in a Casper system before restoring power for the first time?
Answer: Perform a final visual inspection, verify all terminations are secure, confirm correct wire routing, and test insulation resistance before energizing
Before first energization, a thorough pre-power checklist—visual inspection, torque check of terminations, insulation resistance test—prevents damage from wiring errors.