Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

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

TB #8 Electrical Hazards at Fires Flashcards

(49 cards)

Start Studying
1
Q

Quantity of electricity is expressed in __

A

Amperes (amps)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Electrical pressure is measured in __

A

Volts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Electrical resistance is measured in __

A

Ohms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Extremely high voltage __

A

Voltages in excess of 60,000 volts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

High voltage __

A

Voltage from 600 volts up to 59,999 volts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Low voltage __

A

Usually below 600 volts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Conductor =

A

Hose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Current =

A

Water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Voltage =

A

Pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Amperes =

A

Gallons per minute

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Ohms =

A

Friction loss

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Generation facilities generate electricity between __

A

4,000 and 20,000 volts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Voltages on transmission lines range from __

A

69kv to over 1,000 kv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Most of the transmission lines coming into Los Angeles are __

A

230kv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

All voltages above __ are referred to as transmission voltages

A

69kv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

138kv, 230kv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

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

A

Three times

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

150, 34.5kv, 4.8kv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

21
Q

Many commercial and industrial installations have service conductors of __

22
Q

The most effective methods of identifying different voltages are__

Study These Flashcards
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 __

Study These Flashcards
A

10 milliamps (mA)

24
Q

Currents above __ can paralyze or “freeze” muscles

25
Usually it takes about __ of current to cause respiratory paralysis
30 mA
26
Currents greater than __ may cause ventricular fibrillation
75 mA
27
Dry skin may have a resistance of __or more
100,000 ohms
28
Wet skin may have a resistance of only __
1,000 ohms
29
Ultimately, the danger from electrical shock depends on the __
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
Voltage gradient is__
A decreasing current created when a energized wire is in contact with the earth
31
Touch potential occurs __
By contacting a live or energized source
32
Step potential occurs __
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
Aerial ladders must be kept at least __ away from all power lines and devices
Ten feet
34
Responding personnel need to maintain at least __ from the affected wire or pole
One span (the distance between two poles)
35
Streetlights can be fed from conductors carrying __or more
120-6150 volts
36
LADWP maintains approximately __ distribution stations in the city
150
37
Utilize the __ for using hose streams around high voltage
30/33/100 rule
38
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”
Three (3) horizontal strands
39
Vehicles should be driven clear of wires by at least __
35 feet
40
Minimum safe distance from transmission towers __
35 feet
41
Maintain clearance a minimum of __ beyond the outermost wire of electrical transmission lines
100 feet
42
Remain at least __ from transmission lines and __ from transmission towers
100 feet, 35 feet
43
Manhole covers often weigh __ and have been blown __ into the air and a distance of __
300 pounds, 75 feet, 125 feet
44
Water and Power line patrolman’s apparatus operates __ a day, is radio equipped, and can usually reach any area of the City within __
24 hours, ten minutes
45
LADWP tests gloves to __ every __
10,000 volts, 60 days
46
Indicates a transformer vault
Square manhole
47
Flash point of cooling oil used in transformers of underground vaults
Below 300 degrees Fahrenheit
48
High voltage cables in underground vaults can be up to __
230,000 volts
49
Conduit in underground vaults contains __ oil pressure
200 psi

A/O Test (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions