CAT Electrical and Wiring Fundamentals Flashcards
6 cards from real CAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CAT Electrical and Wiring Fundamentals flashcards as text
What wire gauge is most commonly used for low-voltage alarm system wiring?
Answer: 22 AWG
22 AWG is the standard low-voltage wire gauge used in most residential and commercial alarm system installations.
What is the purpose of an end-of-line (EOL) resistor in a security alarm circuit?
Answer: Supervise the circuit so the panel can detect a cut or shorted wire
An EOL resistor allows the panel to continuously monitor the circuit integrity and distinguish between a fault, tamper, or alarm condition.
Which type of wiring configuration is required by NFPA 72 for Class A fire alarm circuits?
Answer: Loop/return path so the circuit survives a single open fault
Class A wiring provides a redundant return path so the system continues to operate even when one section of wire is broken.
What does a supervised circuit in a security alarm system detect?
Answer: Wire cuts and short circuits
A supervised circuit continuously monitors wiring integrity and alerts the panel if the wire is cut (open) or shorted.
Why is shielded cable recommended for alarm keypad wiring?
Answer: To reduce electromagnetic interference that could cause false signals
Shielded cable blocks EMI from nearby electrical sources, preventing corrupted data signals on sensitive alarm communication lines.
How far must alarm low-voltage wiring be separated from high-voltage (120V+) electrical wiring when run in parallel?
Answer: At least 2 inches
NEC Article 760 requires low-voltage alarm wiring to maintain at least 2 inches of separation from power conductors to prevent induced interference.