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A/O Test > TB #8 Electrical Hazards at Fires > Flashcards

TB #8 Electrical Hazards at Fires Flashcards

1
Q

Quantity of electricity is expressed in __

A

Amperes (amps)

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2
Q

Electrical pressure is measured in __

A

Volts

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3
Q

Electrical resistance is measured in __

A

Ohms

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4
Q

Extremely high voltage __

A

Voltages in excess of 60,000 volts

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5
Q

High voltage __

A

Voltage from 600 volts up to 59,999 volts

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6
Q

Low voltage __

A

Usually below 600 volts

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7
Q

Conductor =

A

Hose

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8
Q

Current =

A

Water

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9
Q

Voltage =

A

Pressure

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10
Q

Amperes =

A

Gallons per minute

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11
Q

Ohms =

A

Friction loss

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12
Q

Generation facilities generate electricity between __

A

4,000 and 20,000 volts

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13
Q

Voltages on transmission lines range from __

A

69kv to over 1,000 kv

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14
Q

Most of the transmission lines coming into Los Angeles are __

A

230kv

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15
Q

All voltages above __ are referred to as transmission voltages

A

69kv

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16
Q

The LADWP also has a number of transmission lines with voltages of __ or __

A

138kv, 230kv

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17
Q

The voltage is stepped down __ in the distribution system before it is delivered to most consumers

A

Three times

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18
Q

The LADWP has __ receiving stations which receive the electricity at transmission voltages (__ to __) and step the voltage down to __

A

21, 138kv, 500kv, 34.5kv

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19
Q

There are over __ distribution stations where the electricity is received at __ and stepped down to __

A

150, 34.5kv, 4.8kv

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20
Q

High voltage capacitors have been known to retain a deadly electrical charge even __ after power has been removed from the circuit

A

Weeks

21
Q

Many commercial and industrial installations have service conductors of __

A

34,500 volts

22
Q

The most effective methods of identifying different voltages are__

A

High voltage signs on the cross arms, the size and shape of insulators, the distance between conductors

23
Q

The amount of internal current a person can withstand and still be able to control the muscles of the arm and hand can be less than __

A

10 milliamps (mA)

24
Q

Currents above __ can paralyze or “freeze” muscles

A

10 mA

25
Q

Usually it takes about __ of current to cause respiratory paralysis

A

30 mA

26
Q

Currents greater than __ may cause ventricular fibrillation

A

75 mA

27
Q

Dry skin may have a resistance of __or more

A

100,000 ohms

28
Q

Wet skin may have a resistance of only __

A

1,000 ohms

29
Q

Ultimately, the danger from electrical shock depends on the __

A

Amount of the shocking current through the body, duration of the shocking current through the body, path of the shocking current through the body

30
Q

Voltage gradient is__

A

A decreasing current created when a energized wire is in contact with the earth

31
Q

Touch potential occurs __

A

By contacting a live or energized source

32
Q

Step potential occurs __

A

When responders or victims create a circuit with their feet as they walk over or across a voltage gradient created by an electrical source

33
Q

Aerial ladders must be kept at least __ away from all power lines and devices

A

Ten feet

34
Q

Responding personnel need to maintain at least __ from the affected wire or pole

A

One span (the distance between two poles)

35
Q

Streetlights can be fed from conductors carrying __or more

A

120-6150 volts

36
Q

LADWP maintains approximately __ distribution stations in the city

A

150

37
Q

Utilize the __ for using hose streams around high voltage

A

30/33/100 rule

38
Q

The clearly identified method to assure that fire personnel and other responders do not enter Life Hazard Zones includes the use of a minimum of __ of barrier tape that state “Do Not Enter” or “Do Not Cross”

A

Three (3) horizontal strands

39
Q

Vehicles should be driven clear of wires by at least __

A

35 feet

40
Q

Minimum safe distance from transmission towers __

A

35 feet

41
Q

Maintain clearance a minimum of __ beyond the outermost wire of electrical transmission lines

A

100 feet

42
Q

Remain at least __ from transmission lines and __ from transmission towers

A

100 feet, 35 feet

43
Q

Manhole covers often weigh __ and have been blown __ into the air and a distance of __

A

300 pounds, 75 feet, 125 feet

44
Q

Water and Power line patrolman’s apparatus operates __ a day, is radio equipped, and can usually reach any area of the City within __

A

24 hours, ten minutes

45
Q

LADWP tests gloves to __ every __

A

10,000 volts, 60 days

46
Q

Indicates a transformer vault

A

Square manhole

47
Q

Flash point of cooling oil used in transformers of underground vaults

A

Below 300 degrees Fahrenheit

48
Q

High voltage cables in underground vaults can be up to __

A

230,000 volts

49
Q

Conduit in underground vaults contains __ oil pressure

A

200 psi

A/O Test (18 decks)

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