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Handbook Of Tactics > Ch 21 Electrical Fires and Emergencies > Flashcards

Ch 21 Electrical Fires and Emergencies Flashcards

1
Q

What we has what? Pg 523

A

Pressure, friction loss, and flow rate

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2
Q

Electricity has what? Pg 523

A

Pressure, known as electromotive force or electrical potential difference, and is measured in volts.

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3
Q

What is friction loss? Pg 523

A

Which is a measure of the resistance that it meets, is measured in ohms.

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4
Q

The flow rate in water is referred to what? Pg 523

A

In terms of gallons per minute, with electricity, it is called amperes (commonly referred to as amps for short).

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5
Q

Amperage is what? Pg 523

A

Is determined by the amount of voltage the conductor is delivering and the resistance that the wire or object in the path of the current is offering.

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6
Q

It takes far less than how many amp passing through your body to kill you? Pg 524

A

1

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7
Q

What is voltage? Pg 524

A

Can be described as the pressure that forces electrical current through the lines that carry it.

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8
Q

Many utilities refer to anything less than how many volts as low voltage? Pg 524

A

600

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9
Q

Resistance can be thought of in terms of what? Pg 524

A

Resistance to flow offered to the electricity.

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10
Q

A open circuit is what? Pg 524

A

Is an electrical circuit that does not permit electricity to flow because there is a break in the circuit wire or an open switch

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11
Q

What is a short circuit? Pg 524

A

When an electrical circuits normal path has been interrupted, current is permitted to flow through a path it was not intended to.

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12
Q

What is a utility ground? Pg 524

A

The wiring installed by the utility companies that permits electricity to flow back into their system and then into the earth or ground

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13
Q

What is a house ground? Pg 524

A

The wiring installed by the electrician when building a house that also permits electricity to flow back into the earth or ground in the event the utility ground is broken or open.

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14
Q

The black wire is called what? Pg 525

A

Hot wire

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15
Q

The white wire is called what? Pg 525

A

Neutral

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16
Q

There are two main hazards from electricity? Pg 527

A

Electrocution and burns

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17
Q

Alternating current flow hazardous to humans? Pg 527

A

• 1-5 mA: tingling sensation
• 5-10mA: pain
• 15 mA: Level where muscle construction prevents letting go of a wire in the hand.
• >50 mA: Loss of muscle control, cessation of heart and respiratory functions, death

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18
Q

All ladders and other equipment must be kept at least how many feet from overhead power lines? Pg 528

A

10 ft

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19
Q

What is voltage gradient? Pg 529

A

Is the result of current being dissipated to ground as it travels from a source. Such as downed high voltage wire.

20
Q

Transmission line voltage carry likely exceeds how many volts? Pg 530

A

8,000 volts

21
Q

Distribution line voltage carry between how many volts? Pg 530

A

601 and 8,000 volts

22
Q

Initial responders should isolate the area at least what distance away from any break? Pg 538

A

At least one full wire span.

23
Q

Keep at least how many feet away when using a fog nozzle from all electrical equipment when operating any handling? Pg 538

A

25 ft

24
Q

Keep at least how many feet away when using a solid tip nozzle from any electrical equipment when operating handline? Pg 538

A

40 ft

25
Q

How many full spans greater than the affected span should the perimeter of the operation when encountering downed power lines? p. 537

A

One

26
Q

What is the minimum distance that all ladders and other equipment should be kept from overhead power lines?
Pg 528

A

10 feet

27
Q

Which type of circuit does not permit electricity to flow? p. 524

A

Open

28
Q

How should you hold your hand out if you must move through an area containing electrical hazards with low visibility? p. 535

A

Palms turned back toward your body

29
Q

Which is a correct assumption about voltages in transmission lines? p. 530

A

Higher voltage lines are placed higher on the pole

30
Q

What smell does the overheated ballast give off? p. 540

A

Oily

31
Q

Which type of fire is a transformer primarily classified as being? p. 532

A

Oil

32
Q

Which type of circuit has been created when the normal path has been interrupted and the current is permitted to flow through a path it was not intended to? p. 524

A

Short

33
Q

What is the correct sequence when a hot stick is being used to remove a live wire from a victim? p. 538

A

Place the clamp under the wire and twist the body of the
stick clockwise

34
Q

Which is a poor conductor of electricity? p. 524

A

Glass

35
Q

Which is NOT a correct statement about operations at the generating station? p. 531-532

A

Enter fenced off areas with caution and a handline

36
Q

What handline should always be stretched during operations at downed power lines where the lines are on a vehicle? p. 540

A

1 3/4-inch with a fog nozzle

37
Q

What is the second grounding path normally attached to to guard against injury during a short circuit? p. 535

A

Cold water pipe

38
Q

What is used to cool the generators in a power-generating station? p. 531

A

Hydrogen

39
Q

What is the most frequent response to electrical emergencies in many urban areas? p. 533

A

Manhole fires

40
Q

What is the most important thing that firefighters should be aware of in regard to the transmission system?
p. 525

A

High-voltage wires on poles are not insulated

41
Q

What should handlines be stretched to do at a transformer fire? p. 532

A

Protect the exposures

42
Q

What should be done once the spilled gasoline has been flushed away with the fog nozzle at a downed power line
incident with lines on a vehicle? p. 540

A

Cover with foam

43
Q

What should the occupants of the vehicle with wires down on it be instructed to do if fire is threatening them? p. 539

A

Jump clear of the vehicle without touching the vehicle and
the ground at the same time

44
Q

What can the size of the insulators located on transmission lines tell you?
p. 526

A

Level of voltage

45
Q

What is an indicator of an ongoing electrical arc at manhole fires?
p. 533

A

Rumbling

46
Q

What can be used to wrap visibly exposed wires when found at the base of lampposts? p. 536

A

Electrical tape

Handbook Of Tactics (22 decks)

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