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
When opening breakers at an electrical main, _________ breakers that were already open
Mark
Never de-energize a structure by ________
pulling the electrical meter
_________ cut tri-plex or quad-plex cables
Do not cut
On a wildland fire, the safe distance to maintain is ______
1 ½ pole height
NFPA states that it is safe for a FF to maintain a minimum of ______between the fog nozzle and power lines rated at up to 10,000 V.
4 ft
NFPA states that it is safe for a FF to maintain a minimum of 4 ft between the fog nozzle and power lines rated at up to ________
10,000 V
Fires in electrical sub-stations are considered Class ____ fires
C until de-energized
Fires in transformers that have been de-energized are considered Class ___ fires
B
Only ________ can de-energize head end power on a Metrolink
Metrolink crew
Electric service to Metrolink Blue Line is supplied via a ______V current to the head end power unit
480V
Personnel should never ________ the walls of a Metrolink
Breach or cut
Walls of a metrolink are _______
double lined
A 480v line is routed thru _______ of a metro link
The walls
Metro transit light rail are powered by ______ volts
750 by the OCS (Overhead Catenary System)
Traction power sub stations are located at _______ intervals
1 mile
Each TPSS can be identified by a ______
blue light
The overhead catenary system (OCS) has (4) parts
- Messenger wire
- Hangar
- Contact Wire
- Catenary pole
On hybrid vehicles, high voltage lines are colored ________
Orange
