CET Elevator flashcards
CET Elevator · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- ASME A17.1
- The model safety code for elevators, escalators, dumbwaiters, and moving walks in the US and Canada (harmonized with CSA B44); adopted into law by the authority having jurisdiction.
- Authority having jurisdiction (AHJ)
- The organization or official that adopts the code edition, issues permits, performs or accepts inspections, and enforces compliance for elevators in a given area.
- Category 1 test
- The routine periodic inspection and test, usually annual, covering operation, door safety, emergency communication, and basic safety devices without a full load test.
- Category 5 test
- A thorough periodic test, typically every five years, that includes rated-load and 125% load runs, safety gear, governor, buffer, and brake verification.
- Maintenance control program (MCP)
- A documented, unit-specific maintenance program required by code, listing tasks, frequencies, and records that must be available to the inspector.
- Phase I fire recall
- Automatic or keyed recall of elevators to a designated landing when lobby, machine room, or hoistway smoke detectors activate, disabling normal hall calls.
- Phase II firefighter service
- Keyed in-car operation after Phase I, giving firefighters manual control of doors and travel with normal door and call safety features modified per code.
- NEC Article 620
- The National Electrical Code article covering elevator feeders, branch circuits, disconnects, machine room lighting, and wiring methods for elevator equipment.
- Counterweight sizing
- The counterweight typically equals car weight plus about 40 to 50 percent of rated load, balancing the system near half load and reducing motor effort.
- Governor trip speed
- The speed at which the overspeed governor engages and trips the safety gear, commonly around 115 percent of rated speed per code tables.
- Safety gear
- A car-mounted device that clamps the guide rails when tripped by the governor, stopping and holding an overspeeding or free-falling car.
- Oil buffer
- A pit-mounted energy-absorbing device using hydraulic oil, required for higher-speed elevators to decelerate a car or counterweight beyond normal stopping.
- Door interlock
- A mechanical lock plus electrical contact on each landing door that prevents car motion unless all doors are closed and locked, except in the leveling zone.
- Geared traction machine
- A worm-gear-driven sheave machine used for lower and mid speeds, typically up to a few hundred feet per minute, with an integral brake.
- Gearless traction machine
- A direct-drive permanent-magnet synchronous machine with a disc brake, used for high-speed, high-rise elevators with low maintenance and high efficiency.
- Hydraulic power unit
- The tank, pump, motor, and valve assembly that pressurizes oil to raise a hydraulic car; lowering is by gravity through the valve.
- Regenerative drive
- A variable-frequency drive that returns braking energy to the building supply or a resistor bank instead of dissipating it as heat.
- Lockout/tagout (1910.147)
- The OSHA standard requiring a written energy-control program, machine-specific procedures, locks, tags, and verified zero energy before servicing elevator equipment.
- Permit-required confined space
- A pit with hazards such as atmospheric, engulfment, or entrapment that requires entry permit, attendant, testing, and rescue plan under 29 CFR 1910.146.
- Fall arrest anchorage
- An anchor point for personal fall-arrest systems rated at 5,000 pounds per worker, used with a full-body harness and shock-absorbing lanyard.
- Arc flash PPE category
- A NFPA 70E classification based on incident energy or table selection that determines the arc-rated clothing and face protection required for a task.
- Hoistway barricade
- A guard or barrier at every open hoistway entrance, open pit, or open machinery space that prevents unauthorized access and falling objects.
- Two-person pit rule
- A practice requiring a second trained person and a means of communication when working in the pit or on the car top, enabling prompt rescue.
- Rail plumb tolerance
- The allowable deviation of guide rails from vertical, commonly about 1/8 inch per 100 feet or tighter per manufacturer, affecting ride quality.
- Rope rejection criteria
- Broken-wire counts per lay length, diameter reduction, corrosion, and kinks that determine when suspension ropes must be replaced as a set.
- Hydraulic valve creep
- Car drift from a landing caused by a leaking valve or check valve; tested by measuring movement over a set period with the car stopped.
- Door close force limit
- The maximum kinetic energy and force allowed when a door closes on an obstruction, verified with a gauge and adjusted to code limits.
- 125% load test
- A test run at 125 percent of rated load to verify the machine, brake, and safety devices can stop and hold the car without damage.
- Safety chain
- A series circuit of safety switches (pit, car top, governor, limits, buffers) that must all be closed for the controller to allow car motion.
- Door lock voltage test
- Measuring voltage across each lock contact to locate an open; a faulty contact shows full circuit voltage across it while the chain is open.
- VFD overvoltage fault
- A drive trip during deceleration when regenerated energy raises DC bus voltage, often fixed with a braking resistor or adjusted decel ramp.
- Encoder feedback loss
- A fault where the drive loses position or speed feedback, causing jerky motion or a stall trip; check encoder wiring, alignment, and supply.