CFP Gate Hardware & Access Control Systems 2 — Questions and Answers
Question 1: UL 325 is the safety standard that specifically governs:
- Manual gate latch tensile strength requirements
- Automatic gate operator design, construction, and installation (Correct answer)
- Fence post embedment depths for varying soil conditions
- Chain link fabric gauge and mesh size specifications
Correct answer: Automatic gate operator design, construction, and installation
UL 325 is the Underwriters Laboratories standard for door, drapery, gate, louver, and window operators, establishing safety requirements for automatic gate systems.
Question 2: What safety device creates an invisible beam across a gate opening and stops gate movement when an object breaks the beam?
- Vehicle loop detector
- Photo eye (photoelectric) sensor (Correct answer)
- Pressure-sensitive edge sensor
- Ultrasonic proximity sensor
Correct answer: Photo eye (photoelectric) sensor
Photo eye sensors emit an infrared beam across the gate opening; if the beam is interrupted by a person or object, the gate stops and typically reverses to prevent entrapment.
Question 3: A vehicle loop detector embedded in pavement at an automated gate is primarily designed to:
- Count and log vehicle traffic for reporting purposes
- Detect vehicle presence in the gate path to activate or hold the gate open (Correct answer)
- Measure vehicle axle weight for load monitoring
- Trigger alarms for unauthorized vehicle detection
Correct answer: Detect vehicle presence in the gate path to activate or hold the gate open
Loop detectors sense the inductance change caused by a metal vehicle, triggering the gate to open or preventing it from closing on a vehicle still in the path.
Question 4: Per UL 325, what is the maximum gap dimension under a horizontal slide gate that does NOT constitute an entrapment zone?
- Less than 1 inch
- Less than 2.25 inches (Correct answer)
- Less than 4 inches
- Less than 6 inches
Correct answer: Less than 2.25 inches
UL 325 defines a gap of less than 2.25 inches as too small for entrapment; gaps between 2.25 and 4 inches are classified as entrapment zones and require guarding or elimination.
Question 5: An edge sensor (safety edge or contact sensor) mounted on an automatic gate is designed to:
- Lock the gate in the fully open position
- Stop and reverse the gate immediately upon contact with an obstruction (Correct answer)
- Measure total gate travel distance for limit switch calibration
- Alert the user when battery backup power is low
Correct answer: Stop and reverse the gate immediately upon contact with an obstruction
Edge sensors detect physical contact with a person or object and immediately signal the operator to stop and reverse, preventing crush injuries.
Question 6: Under UL 325 classifications, a Class I automatic residential gate operator is rated for:
- 1 to 25 cycles per day for single-family dwellings (Correct answer)
- 26 to 100 cycles per day for multi-family residential use
- 101 to 500 cycles per day for commercial applications
- Over 500 cycles per day for industrial or high-traffic use
Correct answer: 1 to 25 cycles per day for single-family dwellings
UL 325 Class I operators are designed for single-family residential use with up to 25 open/close cycles per day, while higher classes cover multi-family and commercial traffic levels.
Question 7: A keypad entry system on an automatic gate is categorized as which type of access control?
- Biometric (something you are)
- Card-based (something you have)
- Knowledge-based / PIN (something you know) (Correct answer)
- Remote control (proximity trigger)
Correct answer: Knowledge-based / PIN (something you know)
Keypad systems grant access based on a PIN or code that the user knows, placing them in the knowledge-based category of the three standard access control factors.
CFP Gate Hardware & Access Control Systems 2
UL 325 is the safety standard that specifically governs: