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LAFD 2022-2 > Electrical > Flashcards

Electrical Flashcards

1
Q

Electrical deaths per year (civilian & fire)

A

700 civilian
25 fire

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2
Q

of electrical calls per year

A

3000

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3
Q

Amps

A

Current flow

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4
Q

Volts

A

Pressure behind current flow

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5
Q

Kilovolts

A

1000 volts

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6
Q

Ohms

A

Resistance to electrical current

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7
Q

Ohms law

A

Watts = amps x volts
Amps = watts / volts
Volts = watts / amps

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8
Q

Watts

A

Amount of current times voltage

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9
Q

Voltage ratings

A

Extremely high voltage = > 60,000
High voltage = 600 - 59,900
Low voltage = < 600

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10
Q

Electricity compared to fire hydraulics

A

Conductor = Hose
Current = Water
Voltage = Pressure
Amperes = Gallon per minute
Ohms = Friction

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11
Q

Generation plant volt generation

A

4000 - 20,000

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12
Q

General transmission line voltage

A

69 kv - 1,000kv

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13
Q

LA Transmission line voltage

A

230kv

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14
Q

Insulator length ranges

A

3 - 20ft

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15
Q

of LADWP receiving stations

A

21

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16
Q

Receiving station voltage

A

Received = 138kv - 500kv
Stepped down to 34.5kv

17
Q

Distribution station voltage

A

Received at 34.5kv and stepped down to 4.8kv

18
Q

Primary lines voltage

A

4.8kv

19
Q

Overhead transformer voltage

A

Received = 4.8kv
Stepped down to 120 - 240 volts

20
Q

Conductor

A

Materials that allow electrical current to flow easily (metals and human beings)

21
Q

Insulator

A

Prevent the flow of electricity (glass or porcelain)

22
Q

How to determine high voltage

A

1) signs
2) size and shape of insulators
3) distance between conductors

23
Q

Types of electrical injuries

A

1) electrocution
2) electrical shock
3) burns
4) falls

24
Q

Amount of amps that can paralyze or freeze muscles

A

10 milliamps

25
Q

Most significant factor in resuscitation of electrical shock victims

A

Early defibrillation (for every min defibrillation is delayed, survival chances drop 10%

26
Q

Danger from electrical shock depends on

A

1) Amount of current
2) duration of shock
3) path of shock through body

27
Q

Voltage gradient

A

Decreasing current when energized wire is in contact with ground (ripples)

28
Q

Touch potential

A

Contacting live or energized source

29
Q

Step potential

A

When victims create a circuit with their feet as they walk across voltage gradient

30
Q

Arial odder opperation

A

For high voltage (> 600 volts) operate min of 10 feet away

31
Q

Communication line voltages

A

50 volts

32
Q

30/33/100 rule

A

1) 30 % fog patters
2) 33 feet away
3) 100psi

33
Q

When to have victims exit a charged vehicle

A

only when life threatening emergency exists

34
Q

When do direct hose stream at high voltage lines

A

NEVER

LAFD 2022-2 (16 decks)

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