A701 Electrical emergencies

Question 1

____ is the flow of current through an object, such as wiring in an electrical distribution system.

Answer 1

Amperage

Question 2

As current as little as ___ can cause death.

Answer 2

50 milliamperes

Question 3

electric shock occurs when the body becomes part of the circuit. what are the 3 ways this normally happens?

Answer 3

1. contact with both wires of power source
2. contact with one live wire and the electrical ground
3. ungrounded metallic object that becomes energized while person is in contact with ground

Question 4

At no time shall AFD attempt to extinguish a fire involving energized electrical poles or wires unless…

Answer 4

an authorized rep of the Electric Utility is onscene and verifies the power has been de-energized

Question 5

How far should the apparatus be from a downed wire or pole?

Answer 5

full span of wires (two pole distance)

Question 6

What information should you give dispatch when requesting notification of utility company for a wires arcing or downed power line incident?

Answer 6

an address and/or pole number

Question 7

If a power line is found down at a multi-company incident, notify ___ immediately.

Answer 7

Command

Question 8

What should be the size of the Hot Zone for a pole on fire?

Answer 8

equal to area that line may fall if pole burns through

Question 9

What information should you give dispatch when requesting that AE remotely de-energize equipment for a person in contact with energized high-voltage wire?

Answer 9

exact location (house #, side of street, etc)

Question 10

In what situations should remote de-energization of equipment be used?

Answer 10

buildings where breakers are accessible

Question 11

With a person in contact with energized high-voltage lines, do not proceed with rescue and/or CPR until ___.

Answer 11

an electric utility rep has verified the line is dead and grounded

Question 12

What the first step at a motor vehicle involving wires down with an occupant in the vehicle?

Answer 12

size-up before approach to determine is wires are in contact with vehicle

Question 13

At a motor vehicle accident with wires in contact with the vehicle, and an occupant in the vehicle, what information should you give Dispatch when requesting that the Electric Utility Co cut the power?

Answer 13

good address and/or pole #

Question 14

What is the only reason occupants should leave an energized vehicle?

Answer 14

if it is on fire

Question 15

Rescuers should not approach an energized vehicle until

Answer 15

the electric utility verifies the line is dead and grounded. *does not say they have to be onscene

Question 16

What information should be given to Dispatch when requesting that the electric utility shut power to a circuit for emergency operations involving a pad-mounted transformer?

Answer 16

transformer number or exact address

Question 17

Why should you not attempt to use a dry chem (ABC) or CO2 (BC) extinguisher on a pad-mounted transformer involved in fire?

Answer 17

because the ground might be energized and the possibility of touch potential could be there.

Question 18

T/F A damaged transformer may not spark or make noise like a downed wire.

Answer 18

True. Assume it’s energized.

Question 19

T/F Burning transformers and other electric equipment are ruined and will be replaced anyway. permit them to burn.

Answer 19

True.

Question 20

____ near high-voltage wires can result in shock without even touching a conductor connected to power.

Answer 20

electro-magnetic fields

Question 21

Do not attempt to fight a fire at a substations without

Answer 21

an electric rep ONSCENE to verify that power is off and equipment is grounded.

Question 22

In underground vaults a fault may cause the main power supply to be interrupted, but ___ could still be energized and deadly.

Answer 22

secondaries

Question 23

When is it safe to enter an Austin Energy underground vault involved in fire?

Answer 23

when they are ONSCENE and can assure it is safe

Question 24

___ in vaults are capable of exploding with deadly force, shrapnel, and super-heated oil.

Answer 24

transformers

Question 25

What type of fire can be safely extinguished with CO2 and dry chem extinguishers?

Answer 25

small class C

Question 26

Aerial device overhead utility line clearances?

Answer 26

15’ unless utility verifies power is off, then 10’

Question 27

FFs should maintain ___ clearance from electrical lines or equipment at all times.

Answer 27

15’

Question 28

What type of structure could have a secondary power source?

Answer 28

any size

Question 29

What are possible secondary power sources to buildings?

Answer 29

generator, solar array, UPS

Question 30

what conditions may prevent complete shutdown of power to a building?

Answer 30

open neutrals and faulty grounds

Question 31

what type of extinguishing agents are very conductive?

Answer 31

foam

Question 32

What fires should be considered electrical until proven otherwise?

Answer 32

any in a concealed space (floor, wall, attic, ceiling, roof, soffit)

Question 33

what are good indications of an open neutral or faulty ground?

Answer 33

lights that flicker/dim or appliances/plumbing that give shocks

Question 34

when shutting down electical energy for overhaul, it is preferable to use ___.

Answer 34

main disconnects

Question 35

Plastic insulations materials, conduits, and raceways are coming into widespread use, especially in ____; there is concern about the contribution of the materials to ___ and ____.

Answer 35

large commercial buildings

fire growth and toxicity

Question 36

PPE provided limited protection from shock. Boots can be conductive if ___.

Answer 36

not pure rubber and don’t have dielectric properties, have steel arches/toe protection, or contain carbon substances