Volume 10: Chapter 3, Section 6 Flashcards

1
Q

Electrical accidents account for _______ deaths per year

A

700

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2
Q

Electrocutions account for _______ fire fighter deaths per year

A

25

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3
Q

Low Voltage current ranges from _____ to _____ volts

A
  • 110

* 480

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4
Q

Residential low voltage currents are delivered between ______ and ______ volts

A
  • 110

* 240

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5
Q

Commercial low voltage currents are delivered between ______ and _____ volts

A
  • 240

* 440

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6
Q

High Voltage current ranges above _____ volts

A

600

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7
Q

______ transmission lines will NOT be cut by Department personnel

A

High voltage (600 volts)

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8
Q

CAL OSHA requires aerial ladders to operate with _____ clearance of transmission lines

A

10 ft

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9
Q

When placing ground ladders, a minimum of ______ must be maintained from electric lines

A

10 ft

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10
Q

For downed power lines, a minimum distance of _______ should be the security perimeter

A

30 ft

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11
Q

The only personnel who can determine if a electrical line is de-energized is_______

A

Power utility personnel

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12
Q

_______ are located on power poles below electric transmission lines

A

communication cables

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13
Q

High voltage lines are located on (3)_______

A
  • electric towers
  • concrete poles
  • occasionally wood poles
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14
Q

Voltage thru transmission and sub transmission lines ranges from _____ to _____

A

55kV to 550 kV

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15
Q

Distribution lines on power poles are in excess of ______

A

33 kV

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16
Q

Once elevated supply cables are de-energized, there is residual power of _______

A

20kV

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17
Q

When moving a line the rescuer should _______ the line

18
Q

When extinguishing a fire from a car into a power pole, use ______

A

Class C extinguisher

19
Q

If the fire is near the top of power poles, consider it a _______ fire

20
Q

For fires in vaults or under manhole covers, FF should _______

A

Make no attempt to extinguish until de-energized

21
Q

For fires in vaults or under manhole covers the safety perimeter is____

22
Q

The approved method for de-energizing occupancies is by ______ or switching off circuit breakers

23
Q

When switching off circuit breakers you _____ the breakers

24
Q

When switching off circuit breakers do them ______ and then open the ______

A
  • individually

* master

25
When opening breakers at an electrical main, _________ breakers that were already open
Mark
26
Never de-energize a structure by ________
pulling the electrical meter
27
_________ cut tri-plex or quad-plex cables
Do not cut
28
On a wildland fire, the safe distance to maintain is ______
1 ½ pole height
29
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
30
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
31
Fires in electrical sub-stations are considered Class ____ fires
C until de-energized
32
Fires in transformers that have been de-energized are considered Class ___ fires
B
33
Only ________ can de-energize head end power on a Metrolink
Metrolink crew
34
Electric service to Metrolink Blue Line is supplied via a ______V current to the head end power unit
480V
35
Personnel should never ________ the walls of a Metrolink
Breach or cut
36
Walls of a metrolink are _______
double lined
37
A 480v line is routed thru _______ of a metro link
The walls
38
Metro transit light rail are powered by ______ volts
750 by the OCS (Overhead Catenary System)
39
Traction power sub stations are located at _______ intervals
1 mile
40
Each TPSS can be identified by a ______
blue light
41
The overhead catenary system (OCS) has (4) parts
* Messenger wire * Hangar * Contact Wire * Catenary pole
42
On hybrid vehicles, high voltage lines are colored ________
Orange