Volume 10: Chapter 3, Section 6 Flashcards
Electrical accidents account for _______ deaths per year
700
Electrocutions account for _______ fire fighter deaths per year
25
Low Voltage current ranges from _____ to _____ volts
- 110
* 480
Residential low voltage currents are delivered between ______ and ______ volts
- 110
* 240
Commercial low voltage currents are delivered between ______ and _____ volts
- 240
* 440
High Voltage current ranges above _____ volts
600
______ transmission lines will NOT be cut by Department personnel
High voltage (600 volts)
CAL OSHA requires aerial ladders to operate with _____ clearance of transmission lines
10 ft
When placing ground ladders, a minimum of ______ must be maintained from electric lines
10 ft
For downed power lines, a minimum distance of _______ should be the security perimeter
30 ft
The only personnel who can determine if a electrical line is de-energized is_______
Power utility personnel
_______ are located on power poles below electric transmission lines
communication cables
High voltage lines are located on (3)_______
- electric towers
- concrete poles
- occasionally wood poles
Voltage thru transmission and sub transmission lines ranges from _____ to _____
55kV to 550 kV
Distribution lines on power poles are in excess of ______
33 kV
Once elevated supply cables are de-energized, there is residual power of _______
20kV
When moving a line the rescuer should _______ the line
pull
When extinguishing a fire from a car into a power pole, use ______
Class C extinguisher
If the fire is near the top of power poles, consider it a _______ fire
Class C
For fires in vaults or under manhole covers, FF should _______
Make no attempt to extinguish until de-energized
For fires in vaults or under manhole covers the safety perimeter is____
150 ft
The approved method for de-energizing occupancies is by ______ or switching off circuit breakers
opening
When switching off circuit breakers you _____ the breakers
Open
When switching off circuit breakers do them ______ and then open the ______
- individually
* master