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Training Bulletins > TB8 Electrical hazards > Flashcards

TB8 Electrical hazards Flashcards

1
Q

Electrical deaths per year

A

700 deaths a year

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2
Q

What percent of workers are year electrical deaths

A

12%

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3
Q

How many firefighter deaths in 20 years to the electrical hazards

A

25 firefighter deaths

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4
Q

Current flow or electron flow

A

Amps

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5
Q

Push or pressure behind current flow

A

Volts

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6
Q

Measurement of resistance

A

Ohms

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7
Q

Power is the amount of current time is the voltage level at a given point

A

Watts

Watts = amps x volts

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8
Q

High voltage

A

600 V up to 59,999 V

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9
Q

G. P. M

A

Amps

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10
Q

Transmission line rangers

A

69 kV – 100 kV

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11
Q

How long can transmission insulator be from

A

3 feet to 20 feet long

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12
Q

LADWP HAS SOME Transmission lines at

A

138 kV to 230 kV

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13
Q

How many times is the voltage step down in the distribution system before it’s delivered to most consumers

A

3 times

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14
Q

How many receiving stations

A

21

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15
Q

How many distribution stations

A

150

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16
Q

Receiving station electricity

A

138 kV Dash 500 kV and step the voltage down to 34.5 kV which is referred to sub trans mission

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17
Q

How long have a high voltage capacitors been known to retain Deadly electrical charge after being shut down

A

Weeks

18
Q

What are the most common Distribution transformers

A

Pole mounted transformer

19
Q

Transformer circuits step voltage down

A

4.8 kV step down voltage to 120/240 V

20
Q

Many commercials have service connectors of how many volts

A

34,500 V

21
Q

The degree of shock and injuries depends on the amount of what passing through the body

A

Current and length of time current passes through

22
Q

How much amps of the electricity through the body can cause death

A

1/10 of an amp electricity going through the body for just two seconds is enough to cause death

23
Q

How many amps can cause paralyzation of muscles to freeze

A

10 ma

24
Q

What are the four types of electrical injuries

A

Electrocution

electrical shock

electrical burns

electrical falls

25
Q

When is heart paralysis and damage to organs occur

A

4 AMPs

26
Q

Tissues Burn with currents greater than

A

5amps

27
Q

Dry skin may have a resistance of

A

100,000 ohms or more

28
Q

What skin resistance

A

1000 ohms

29
Q

What is the most common shock related non-fatal injury

A

Burn

30
Q

If within the 10 foot rule Performing a rescue apparatus operator should do what

A

Remien pedestal to provide personal safety

31
Q

How many votes can overhead communication cable of a power pole be energized with

A

50 V

32
Q

Street light voltage

A

120-6150 V

33
Q

30/33/100 route for using Hose stream

A

30° fog pattern

33 feet from energize source

Minimum 100 psi tonight also strong stream will reduce conductivity

34
Q

Identification of electrical hazard

A

Three horizontal strands of barrier tape

Tape states “do not enter “ “do not cross “

Tape between 1 inch and 3 inches

35
Q

How many feet she vehicle be driving clear of wires for electrical emergency rescue considerations

A

35 feet

36
Q

LA DWP can D energize lines in a relatively short time for rescues how long

A

5 to 10 minutes

37
Q

Electrical hazards at wildland fire maintain safe distance from transmission towers minimum of

A

35 feet

38
Q

How many minimum clearance of feet beyond the outer most wire of electrical transmission lines at wild land fire

A

100 feet

39
Q

Explosive range for carbon monoxide

A

12.5 to 74%

40
Q

How much do manhole covers weigh how far blown and what distance

A

300 pounds have been blown 75 feet into the air and a distance of 125 feet

41
Q

The main fire hazard with an electrical vault in the cooling oil used for transformers has flash point of

A

Below 300°F

42
Q

Hi voltage cables up to 230,000 V underground vault may be located close to the floor inside conduit containing how much oil pressure

A

200 psi of oil pressure

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