4. Building Systems Flashcards
The stairs have intermediate landings between floors and reverse direction at that point.
Return stairs
Page 95
The stairs are often found as grand stairs or convenience stairs serving only two levels.
Circular stairs
Page 96
Fire protection that uses moving mechanical or electrical parts that work as a system and require a power source for operation.
Active fire protection
(vs passive)
Page 99
Enclosures that protect the stairwell enclosure and provide a means of smoke ventilation before the smoke enters the stairwell.
Passive smokeproof enclosure
Page 100
Stairwell that is designed to pressurize when the fire alarm system is activated.
Active smokeproof enclosures
Page 100
Stairways that are not enclosed with fire rated construction.
Open stairways
Page 101
When an elevator meets the necessary qualifications, it may be used during emergency response. Before such use, firefighters should:
Record the elevator to the lobby and open the door from a floor level above to check the shaft for smoke.
Page 103
Passenger elevators design to also carry freight.
Service elevators
Page 104
Modern elevator cables are made of:
Flat polyethylene- coated steel belts
Page 104
And electrical switch the terminates power before the elevator reaches the upper or lower limits of the hoistway.
Terminal device
Page 108
Large springs or hydraulic cylinders and pistons located at the bottom of the pit that act as a shock absorber when the terminal switch fails.
Buffers
Page 108
The switch slows the drive motor when an elevator starts to exceed a safe speed. If the car continues to accelerate, the switch trips the over speed switch and applies the car safeties
Speed-reducing switch
Page 108
This switch is activated if the speed-reducing switch fails to slow the car sufficiently.
Overspeed switch
Page 108
Tape repair of steel jars that wedge against the guide rails and bring the elevator to a stop. Design to stop a freefalling car.
Car safeties
Page 109
Floors some distance up a high-rise that are used as a common discharge floor for two separate elevator systems.
Ski lobbies
Page 111
