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Electrical Safety Handbook > 4.0 Overhead Power Lines > Flashcards

4.0 Overhead Power Lines Flashcards

1
Q

What are the three main parts of a typical electrical system?

a. Connection, Transmission, Distribution.
b. Generation, Connection, Distribution.
c. Generation, Transmission, Distribution.
d. Connection, Generation, Transmission.

A

C

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2
Q

How is electricity transported throughout the province of Ontario?

a. Through underground pipelines.
b. By air using drones.
c. Via transmission systems.
d. Through water channels.

A

C

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3
Q

What are the typical voltages for transmission lines bringing power into cities in Ontario?

a. 5,000 to 20,000 volts.
b. 69,000 to 500,000 volts.
c. 20,000 to 69,000 volts.
d. 115,000 to 230,000 volts.

A

B

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4
Q

How are power lines supported or suspended from structures?

a. By magnetic levitation.
b. By direct contact with the structure.
c. By hanging on hooks.
d. By using insulators.

A

D

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5
Q

What type of insulators are suspended from structures with the conductor running on the bottom of the stack?

a. Screw-type insulators.
b. Pin-type insulators.
c. Bell-type insulators.
d. Disk-type insulators.

A

C

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6
Q

What is the recommended safe distance to keep from live high voltage transmission lines?

a. 1 meter (3 feet).
b. 3 meters (10 feet).
c. 6 meters (20 feet).
d. 10 meters (33 feet).

A

C

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7
Q

If you need to work closer to high voltage transmission lines, what should you first determine?

a. Weather conditions.
b. The time of day.
c. The voltage.
d. The length of the power lines.

A

C

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8
Q

How can you determine the voltage of high voltage transmission lines?

a. Measure the height of the steel structure.
b. Count the number of insulators.
c. Contact Hydro One and provide the alphanumeric number found on the structure.
d. Check the color of the power lines.

A

C

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9
Q

What is the typical voltage range for distribution power lines from a substation to local distribution transformers?

a. 69,000 to 500,000 volts.
b. 2,400 to 44,000 volts.
c. 120/240 volts.
d. 1,000 to 10,000 volts.

A

B

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10
Q

What voltage range is typically used for industrial use after the voltage is reduced by smaller transformers on poles or the ground?

a. 120/240 volts.
b. 347/600 volts.
c. 2,400 to 27,600 volts.
d. 44,000 volts.

A

B

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11
Q

What voltage is commonly used for residential use after the voltage is reduced by smaller transformers on poles or the ground?

a. 120/240 volts.
b. 347/600 volts.
c. 2,400 to 27,600 volts.
d. 44,000 volts.

A

A

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12
Q

What reduces the voltage from primary to secondary voltages (120/240 or 347/600 volts) on distribution poles?

a. Insulators.
b. Transformers.
c. Crossarms.
d. Conductor coating.

A

B

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13
Q

Where are the high voltage primary lines (2,400 to 27,600 volts) typically located on a distribution pole?

a. Above the transformer.
b. Below the transformer.
c. On the side of the pole.
d. Inside the transformer.

A

A

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14
Q

What is used to attach power lines to distribution poles and prevent the flow of electricity to the ground?

a. Weather coating.
b. Crossarms.
c. Pin type insulators.
d. Steel structures.

A

C

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15
Q

What type of insulators carry the conductor on top and are used for 44,000 volts or less?

a. Bell-type insulators.
b. Disk-type insulators.
c. Pin-type insulators.
d. Screw-type insulators.

A

C

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16
Q

In case of a vehicle accident involving a distribution pole, what hazard can be created if the conductors are knocked off the insulators?

a. Fire hazard.
b. Explosion hazard.
c. Electric shock hazard.
d. Chemical hazard.

A

C

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17
Q

What information can be found on Hydro One Networks’ pole number plate?

a. Voltage of the power lines.
b. Pole’s age.
c. Six-character alphanumeric code.
d. Location of the nearest fire hydrant.

A

C

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18
Q

What is the purpose of a fuse cutout in a distribution system?

a. To store electrical energy.
b. To protect transformers and customers’ equipment from damage.
c. To regulate the flow of electricity.
d. To generate lethal amounts of current.

A

B

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19
Q

What caution should be taken if a capacitor has fallen to the ground?

a. Touch it to check for damage.
b. Move it to a safer location.
c. Do not touch it or attempt to move it.
d. Discharge it using a metal tool.

A

C

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20
Q

How are both transmission and distribution power lines protected from faults in the system?

a. Fuse cutouts.
b. Capacitors.
c. Reclosers.
d. Switches.

A

C

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21
Q

What action does an automatic recloser take after a power line is tripped out due to a fault?

a. Stay open indefinitely.
b. Close and re-energize the power line after a short period.
c. Switch to an alternative power source.
d. Deactivate all nearby power lines.

A

B

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22
Q

Why should all downed power lines be treated as live?

a. They are always live.
b. It is an industry standard.
c. They may become live unexpectedly.
d. Emergency responders prefer it that way.

A

C

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23
Q

What is the role of the Utility Control Room in the operation of reclosers?

a. Physically operate reclosers.
b. Monitor the distribution system.
c. Repair reclosers.
d. Deactivate reclosers.

A

B

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24
Q

What may happen to power lines during storms, vehicle accidents, or other abnormal situations?

a. They become less hazardous.
b. They are disconnected from the system.
c. They may break or fall.
d. They generate less current.

A

C

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25
Q

Why could power lines not connected to the system still be energized?

a. They are malfunctioning.
b. Backfeed from electrical generators, solar panels, or wind turbines.
c. They have capacitor backups.
d. They draw energy from nearby transformers.

A

B

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26
Q

How should emergency responders approach downed or low hanging lines?

a. Assume they are de-energized.
b. Use a metal tool to test for current.
c. Treat them as live and secure the area.
d. Move them away with insulated gloves.

A

C

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27
Q

In the context of electrical backfeed, what action should be taken if the situation is life-threatening?

a. Contact the owner or manager and ask them to turn off the backfeed source.
b. Evacuate the area immediately.
c. Wait for the electric utility to arrive.
d. Touch the backfeed source to assess its temperature.

A

A

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28
Q

What is the recommended distance for parking a vehicle when fallen wires are present?

a. 5 meters (16 feet)
b. 10 meters (33 feet) or more
c. 20 meters (66 feet)
d. Any distance is safe

A

B

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29
Q

Why is it important to use a flashlight when examining the surroundings at night?

a. To signal for help
b. To locate wire ends
c. To take clear photographs
d. To measure the distance from the fallen wires

A

B

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30
Q

What should you do if a live wire touches a conducive object like a car or metal fence?

a. Touch the object to check for current
b. Ensure all potentially electrified objects are inaccessible
c. Assume the object is safe
d. Inform emergency responders nearby

A

B

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31
Q

How far should bystanders be kept from fallen wires?

a. 2 meters (7 feet)
b. 5 meters (16 feet)
c. 10 meters (33 feet)
d. 15 meters (50 feet)

A

C

32
Q

What should you establish at least 10 meters away from fallen wires?

a. Emergency shelter
b. Safe zone
c. Trauma center
d. Parking area

A

B

33
Q

Why is it important to face oncoming pedestrians and traffic while securing the area?

a. To assess their intentions
b. To avoid eye contact
c. To keep people away from fallen wires
d. To guide them towards the fallen wires

A

C

34
Q

What should you do if a live wire has fallen into a pool of water?

a. Jump into the water and remove the wire
b. Use a non-conductive object to fish out the wire
c. Ignore it as water will neutralize the electricity
d. Inform electrical utility personnel and secure the area

A

D

35
Q

Why should you not attempt to move any fallen wires on your own?

a. They are usually not live
b. Only electrical utility personnel can safely determine if they are live
c. They are lightweight and easy to handle
d. Moving them is not necessary in an emergency

A

B

36
Q

What is the purpose of the statement “Stay in the vehicle, we are contacting the electrical utility”?

a. To ask for permission to approach
b. To reassure victims inside vehicles and inform them
c. To request help from bystanders
d. To inform about the presence of emergency responders

A

B

37
Q

Why should people be instructed to stay clear when the ground is electrified?

a. To avoid accidents
b. To prevent property damage
c. To protect themselves from electric shock
d. To give space for emergency responders

A

C

38
Q

What should an emergency responder do if a fallen wire lies on top of, or under a vehicle with people inside?

a. Approach immediately to assess the situation
b. Determine the safe zone and secure the area
c. Move the vehicle away from the fallen wire
d. Try to remove the fallen wire

A

B

39
Q

In the situation where the driver is able to move the vehicle, what precaution should be taken?

a. Instruct the driver to very slowly move the car away
b. Monitor for changes in the situation
c. Advise the driver to leave the vehicle immediately
d. Instruct the driver to approach the fallen wire

A

A

40
Q

If the vehicle cannot be moved and there is no fire, what action should be taken with the occupants inside?

a. Instruct occupants to jump out of the vehicle
b. Advise occupants to remain inside the vehicle
c. Ask occupants to push the vehicle away
d. Instruct occupants to extinguish the fire

A

B

41
Q

In case of unconscious victims with fallen wires near the vehicle, what instruction should be given?

a. Instruct them to move away immediately
b. Tell them to wait until the power line is de-energized
c. Advise them to extinguish any fires around
d. Instruct them to try to move the fallen wires

A

B

42
Q

What is the recommended distance for jumping clear of a vehicle in certain circumstances?

a. 5 meters (16 feet)
b. 10 meters (33 feet)
c. 15 meters (50 feet)
d. 20 meters (66 feet)

A

B

43
Q

What is the advised action in a worst-case scenario where occupants are injured, the vehicle is on fire, and it cannot be moved?

a. Use water to extinguish the fire
b. Instruct occupants to jump clear of the vehicle and avoid touching the car, take short shuffle steps
c. Seek assistance from trained electrical utility personnel
d. Attempt to move the vehicle to a safer location

A

B is most immediate

44
Q

What is a potential hazard associated with roadway stripping with metal backing in contact with downed power lines?
a. Increased road visibility
b. Electrical current traveling along the metal foil backing
c. Enhanced road safety
d. Improved road markings

A

B

45
Q

In a recorded incident, how far did the electrical current travel along the metal foil backing from a downed power line?
a. 10 meters (33 feet)
b. 20 meters (66 feet)
c. 33 meters (100 feet)
d. 50 meters (164 feet)

A

C

46
Q

What is the electrical contact hazard associated with electric and hybrid vehicles damaged in a motor vehicle accident?
a. Short circuits in the lighting system
b. Tire explosions
c. High voltage energy in batteries and wiring
d. Engine overheating

A

C

47
Q

What precaution should emergency responders take if damage to high voltage components or cables is suspected in an electric or hybrid vehicle?
a. Ignore the damage
b. Call for additional emergency personnel
c. Disconnect the high voltage circuit
d. Refer to the manufacturer’s emergency procedures manual

A

C and D

48
Q

What color is typically used to code the high voltage line running along the underside of an electric or hybrid vehicle chassis?
a. Blue
b. Red
c. Green
d. Orange

A

D

49
Q

When using “extricating” equipment to remove occupants from a damaged electric or hybrid vehicle, what precaution should be taken regarding the high voltage line?
a. Stay within the cut zone illustrated in blue
b. Cut through the high voltage line for easy access
c. Focus on the areas with visible damage
d. Ensure the vehicle is completely submerged in water

A

A

50
Q

What are some common causes of fires on wood poles carrying conductors and other electrical distribution equipment?
a. Excessive moisture
b. Lightning, defective or damaged equipment, broken wires, tree limbs, wind, or ice storms
c. Chemical reactions in the wood
d. Rodent activity

A

B

51
Q

Why is it essential to wear full turnout gear and SCBA when fighting fires on power line equipment?
a. To stay warm in cold weather
b. To look professional
c. To protect against potential chemical exposure
d. To prevent injuries from falling objects

A

C

52
Q

What should be done to water before applying it to electrical fires on wood poles and other distribution equipment?

a. Boil it to sterilize
b. Add soap for better adherence
c. Ensure it meets drinking water standards
d. Increase the pressure at the nozzle to 700kpa and use 30 degree Fog pattern

A

D

53
Q

What is the minimum safe distance when using water on live electrical equipment with a voltage of 15,001 to 500,000 volts?

a. 1.5 meters (5 feet)
b. 4 meters (13 feet)
c. 7 meters (23 feet)
d. 10 meters (33 feet)

A

C

54
Q

What is the critical precaution to observe when applying water directly to a fire on electrical equipment?
a. Use a straight water stream for better effectiveness
b. Apply foam before water
c. Keep a safe distance and use a fog spray
d. Direct water at the source of the fire

A

C

55
Q

Why should foam not be used on live electrical equipment?

a. Foam is flammable
b. Foam can damage the equipment
c. Foam is a good electrical conductor
d. Foam causes corrosion

A

C

56
Q

What is the first step to be taken when faced with a fire on power line equipment in a transmission right-of-way?
a. Attempt to extinguish the fire immediately
b. Assess the situation from at least 10 meters (33 feet) back
c. Call the local electrical utility
d. Evacuate the area without assessing the situation

A

B

57
Q

Why is it essential to determine the voltage involved in a transmission line fire?

a. To calculate the water pressure required
b. To estimate the intensity of the fire
c. To inform the local weather department
d. To ensure proper application of safety measures

A

D

58
Q

What should be the minimum safe zone distance when directing a fog stream at high voltage lines during a fire?

a. 5 meters (16 feet)
b. 10 meters (33 feet)
c. 15 meters (50 feet)
d. 20 meters (66 feet)

A

B

59
Q

What precaution should be taken when applying water to a transmission line fire producing significant flames and smoke?

a. Increase the water pressure to the maximum
b. Approach the fire closely to enhance efficiency
c. Use a straight water stream for better effectiveness
d. Increase the safe distance due to arc-over hazard

A

D

60
Q

What is the Arc-Over Hazardous Zone distance for a power line voltage of 500,000 volts?

a. 10 meters (33 feet)
b. 15 meters (50 feet)
c. 32 meters (100 feet)
d. 50 meters (165 feet)

A

C

61
Q

What additional hazard do wood pole structures pose during fires?

a. High voltage exposure
b. Increased air pollution
c. Combustibility
d. Strong electromagnetic fields

A

C

62
Q

In situations where the fire has not reached the right-of-way and wood poles are involved, what efforts should be made?

a. Ignite controlled backfires
b. Apply fire retardant directly to the pole
c. Soak down or apply fire retardant up to 3 meters from the base of the poles
d. Use foam to smother the flames

A

C

63
Q

What precaution must be observed when applying fire retardant to wood pole structures?

a. Apply directly to the pole for better protection
b. Ensure the pole is chemically treated before application
c. Avoid applying fire retardant to the pole
d. Use a higher concentration of fire retardant for better results

A

C

64
Q

In a situation where the right-of-way is fully involved with fire, but the fire only involves low-level vegetation, what action should be taken?

a. Apply a direct water stream to the fire
b. Assess the situation from a safe distance
c. Apply limits of approach for step potential and apply a fog stream at 10 meters
d. Evacuate the area without taking any action

A

C

65
Q

When the right-of-way is fully involved with fire, and the fire involves vegetation such as small trees and flames, or intense smoke is within 2 meters of high voltage power lines, what action should be taken?

a. Apply fire retardant directly to the power lines
b. Apply limits of approach for step potential and apply a fog stream at 10 meters
c. Use foam to suppress the flames
d. Evacuate the area and wait for natural extinguishment

A

B

66
Q

What precaution should be taken when using aerial tankers to drop water or fire retardant on rights-of-way?

a. Apply directly to insulators for better coverage
b. Request transmission line energization
c. Minimize coating of towers and insulators
d. Increase the concentration of retardant for better effectiveness

A

C

67
Q

Why is the retardant used in aerial tanker drops considered highly corrosive and a good conductor?

a. To enhance its firefighting capabilities
b. To minimize environmental impact
c. It is a byproduct of power line maintenance
d. It can cause arc-over if applied to insulators

A

D

68
Q

When conducting aerial tanker drops, what action should be taken regarding the transmission line?

a. Request energization for better safety
b. Drop retardant directly on the transmission line
c. Request de-energization of the transmission line
d. Avoid any communication with the electrical utility

A

C

69
Q

If fire retardant must be dropped across the right-of-way to stop a fire, how should the pilot apply it?
a. Directly on the towers for better protection
b. Parallel to the lines (optimum safe application)
c. Across the transmission lines at the midpoint
d. At the base of the towers for better coverage

A

B

70
Q

Why is it crucial for emergency responders to be aware of the potential dangers of trees contacting power lines?
a. Trees can steal electricity from power lines
b. Tree limbs can conduct electricity and pose a severe shock hazard
c. Trees enhance the conductivity of power lines
d. Trees have a natural repellent against electrical current

A

B

71
Q

What is the first recommended action when responding to a situation involving trees or objects in contact with a power line?

a. Attempt to remove the objects immediately
b. Call local electrical utility and inform them of the location
c. Assess the situation from the distances in Ground Step Potential Hazard Table 5
d. Secure the area and wait for emergency responders

A

C

72
Q

What is the purpose of determining the objects (tree branch, ladder, pole, etc.) in contact with or close to power lines?

a. To identify potential hazards
b. To assess the structural integrity of the objects
c. To gather information for a report
d. To remove the objects immediately

A

A

73
Q

If objects are in contact with power lines, what should be the next step according to the recommended actions?

a. Attempt to remove the objects
b. Determine the safe zone and secure the area
c. Call local electrical utility and request energization
d. Ignore the situation and proceed with other tasks

A

B

74
Q

Why is it important to call the local electrical utility when objects are in contact with power lines?

a. To report the incident for documentation
b. To request maintenance on the power line
c. To inquire about power outages
d. To inform them of the location and nature of the object contacting the power line

A

D

75
Q

What action should be taken while waiting for the local electrical utility personnel to arrive?

a. Attempt to isolate and de-energize the power line
b. Assess the situation from a closer distance
c. Secure the area and wait for the local electrical utility personnel
d. Remove the objects immediately to restore power

A

C

Electrical Safety Handbook (9 decks)

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