A701 Electrical emergencies Flashcards
____ is the flow of current through an object, such as wiring in an electrical distribution system.
Amperage
As current as little as ___ can cause death.
50 milliamperes
electric shock occurs when the body becomes part of the circuit. what are the 3 ways this normally happens?
- contact with both wires of power source
- contact with one live wire and the electrical ground
- ungrounded metallic object that becomes energized while person is in contact with ground
At no time shall AFD attempt to extinguish a fire involving energized electrical poles or wires unless…
an authorized rep of the Electric Utility is onscene and verifies the power has been de-energized
How far should the apparatus be from a downed wire or pole?
full span of wires (two pole distance)
What information should you give dispatch when requesting notification of utility company for a wires arcing or downed power line incident?
an address and/or pole number
If a power line is found down at a multi-company incident, notify ___ immediately.
Command
What should be the size of the Hot Zone for a pole on fire?
equal to area that line may fall if pole burns through
What information should you give dispatch when requesting that AE remotely de-energize equipment for a person in contact with energized high-voltage wire?
exact location (house #, side of street, etc)
In what situations should remote de-energization of equipment be used?
buildings where breakers are accessible
With a person in contact with energized high-voltage lines, do not proceed with rescue and/or CPR until ___.
an electric utility rep has verified the line is dead and grounded
What the first step at a motor vehicle involving wires down with an occupant in the vehicle?
size-up before approach to determine is wires are in contact with vehicle
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?
good address and/or pole #
What is the only reason occupants should leave an energized vehicle?
if it is on fire
Rescuers should not approach an energized vehicle until
the electric utility verifies the line is dead and grounded. *does not say they have to be onscene
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?
transformer number or exact address
Why should you not attempt to use a dry chem (ABC) or CO2 (BC) extinguisher on a pad-mounted transformer involved in fire?
because the ground might be energized and the possibility of touch potential could be there.
T/F A damaged transformer may not spark or make noise like a downed wire.
True. Assume it’s energized.
T/F Burning transformers and other electric equipment are ruined and will be replaced anyway. permit them to burn.
True.
____ near high-voltage wires can result in shock without even touching a conductor connected to power.
electro-magnetic fields
Do not attempt to fight a fire at a substations without
an electric rep ONSCENE to verify that power is off and equipment is grounded.
In underground vaults a fault may cause the main power supply to be interrupted, but ___ could still be energized and deadly.
secondaries
When is it safe to enter an Austin Energy underground vault involved in fire?
when they are ONSCENE and can assure it is safe
___ in vaults are capable of exploding with deadly force, shrapnel, and super-heated oil.
transformers
