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SSSStudy > TB- 8: Electrical Hazards at Fires > Flashcards

TB- 8: Electrical Hazards at Fires Flashcards

1
Q

Define AMPS.

A

Current flow/electron flow
*can be compared to flow of water through hose

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2
Q

Define VOLTS.

A

Difference in electrical potential
*compared to PSI in water hydraulics

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3
Q

Define OHMS.

A

Electrical resistance that determines current flow
*compared to friction loss

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4
Q

What is OHMs Law?

A

Relationship of power:
Watts-amps x volts
Amps-watts x volts
Volts-watts x amps

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5
Q

Define WATTS.

A

amount of current power times volts

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6
Q

What is the range for high voltage?

A

600 volts to 59,999 volts

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7
Q

What is low voltage

A

below 600 volts

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8
Q

What are the three systems that get electricity to
the consumer?

A

Generation, Transmission, Distribution system

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9
Q

What are the two main components of the
transmission system?

A

Grids
Transmission lines

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10
Q

What are overhead transformers?

A

pole mounted transformers installed on 4.8kV
lines stepping down power to 120/240 volts

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11
Q

What are the four main types of electrical injuries?
Electrocution, electrical shock, burns, and falls

A

Electrocution, electrical shock, burns, and falls

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12
Q

Cal OSHA requires ladders be how far away from
600 volts or more?

A

10 feet

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13
Q

Street lights can carry how many volts?

A

120-6150

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14
Q

When hose streams are utilized on electrical fires,
what guidelines should be adhered to?

A

30 degree fog pattern
33 feet from energized source
100 PSI minimum

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15
Q

Life hazard zones should be clearly identified by?

A

Minimum of 3 horizontal barrier tapes
Three 1” to 3” lettering on stationary objects

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16
Q

Vehicles should be driven clear of wires when
possible by how many feet?

A

at least 35

17
Q

During brush operations, firefighters should?

A

-maintain distance of 35 ft from transmission towers
-maintain clearance of 100 ft from outermost wires
-never direct hose streams on smoke/fire within
100 ft of high voltage wires

18
Q

What is the minimum distance kept from downed
power lines that have not been de-energized?

A

Distance equal to length between two poles

19
Q

Man hole covers typically weigh? and can travel?
Weigh 300 lbs

A

Travel 75 ft in the air and distance of 125 ft.

20
Q

In an emergency where high voltage wires need to be cut, member should?

A

Contact MFC for Water and Power line patrolman
who is available 24 hrs a day and usually within
10 minutes of any area in the city

21
Q

Rubber gauntlet gloves are tested?

A

by DWP to 10,000 volts every 60 days

22
Q

What is the definition of Extremely High Voltage?

A

Over 60,000 volts

23
Q

There are 21 LADWP Receiving Stations. These
stations step the voltage down from what to what?

A

138kv - 500kv down to 34.5k

24
Q

Wires on poles shall not be cut by firefighters
unless what situation exists?

A

There is an immediate life hazard

25
Q

If the LAFD cuts wires, they must be below what
voltage?

A

600 volts

26
Q

Aerial ladders must be kept at least how many feet away from wires and devices?

A

10 feet

27
Q

When may aerials be operated within the 10’ rule?

A

Only to attempt an actual rescue

28
Q

To work WITHIN the 10’ rule, what must be done?

A

A/O shall remain at pedestal to provide for
personnel safety

29
Q

Normal communication lines mounted to the lowest level of power poles can be energized with up to how many volts?

A

50 volts

30
Q

Ground ladders must be kept at least how far from overhead wires and transformers?

A

10 feet

31
Q

Water by nature is not a good conductor, what two
factors increase the conductivity of water?

A

Dissolved minerals and impurities in the water

32
Q

What is the explosive range for Carbon Monoxide
(CO)?

A

12.5 to 74%

33
Q

What is the flash point of the cooling oil used in the transformers?

A

Below 300 degrees F

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