Pump Ops Chapter 17 Flashcards
(25 cards)
How far must aerial devices stay away from overhead power lines energized between 600 and 50,000 volts?
At least 10 feet (3 m)
How far must aerial devices stay from high-voltage transmission lines over 50,000 volts?
At least 50 feet (15 m)
What is the OSHA clearance requirement for power lines under 350 kilovolts?
20 feet (6 m)
What is the clearance requirement for power lines over 350 kilovolts under OSHA standards?
50 feet (15 m)
How far can electricity arc from a power line?
Up to 10 feet (3 m)
What angle provides the greatest jackknifing stability for tillered aerial apparatus?
60° from inline with the aerial extended away
What distance should additional apparatus be placed behind a main unit on highways for buffer?
150 to 200 feet (45–60 m)
What is the required clearance above railroad tracks for aerial operation when confirmed safe?
At least 25 feet (7.5 m)
What distance should aerial apparatus be parked away from railroad tracks?
At least 25 feet (7.5 m)
What is the optimal angle for unsupported aerial device loading?
70° to 80° from horizontal
At what building height should aerial apparatus be placed closest to the building, inside of engines?
More than 5 stories or over 60 ft (20 m)
How much clearance should be maintained from bridge superstructure electric lines?
10 feet (3 m)
What is the recommended safe distance from a potentially energized vehicle during exit?
Up to 150 feet (45 m)
What is the collapse zone definition in terms of distance?
Area beneath a wall where it would likely fall—at least equal to the height of the wall
Why should you not park aerial apparatus on thin-skinned pavements like parking lots?
They can puncture, sink, or tip under apparatus weight
What is the most stable position for aerial device operation?
Directly over the front or rear of the apparatus, aligned with the longitudinal axis
How much weight was the aerial device supporting during the Pennsylvania case incident?
Approximately 630 lb (300 lb water + 30 lb master stream + 300 lb firefighter/PPE)
What percentage of the safe load limit was exceeded in the Pennsylvania incident case?
192% of the safe load limit at the tip
Why is jackknifing beyond 90 degrees not recommended for tillered aerials?
Stability decreases rapidly beyond 90°
What operational error can significantly increase stress on an aerial device?
Operating at low angles with long extensions
What action should be taken if a truck has only 2 jacks and is operating on a hill?
It must be stabilized while facing uphill
Why should aerial devices avoid manholes or storm drains during hazmat incidents?
Flammable materials may ignite underground
What surface issues should be avoided when parking aerials in hot weather?
Asphalt surfaces that show shiny/glassy ‘bleeding’ signs of heat softening
How far apart should aerial apparatus be staggered when operating on a bridge?
Operate on different spans or traffic lanes, not clustered
