T.B. 8 - Electrical Hazards: Saftey & Operations Flashcards
HIGH VOLTAGE is from _____ to _____ volts?
600 to 59,999 volts
Extremely High Voltage is in excess of how many volts?
60,000 volts
Streetlights can be fed by conductors carrying ____ to ____ volts.
120 to 6,150 volts
LADWP considers Streetlights to be energized and _____ voltage at all times.
High
Water is NOT a good conductor but there are TWO factors that can increase conductivity :
- _______ ________
- __________
Dissolved Minerals
Impurities
Utilize the 30/33/100 Rule for using hose streams around High Voltage:
- The Fog Spray should be set to a ___ degree fog pattern. (straight streams or foam should not be used on high voltage sources).
- Maintain a distance of at least ___ ft. from an energized source.
- Ensure a minimum of ___ psi is pumped to the nozzle. (a strong stream will reduce conductivity).
- 30 degrees
- 33 ft.
- 100 psi
What is the 30/33/100 Rule consist of?
30 degrees, 33 ft. away, 100 psi for hose streams
LADWP recommends not approaching a HIGH VOLTAGE source closer than one’s _____ ______.
body length
*so that a fall forward will not cause direct body contact
A minimum of how many horizontal strands of barrier tape should be used for Life Hazard Zones?
3 strands
Firefighters responding to incidents in which individuals are trapped by DOWNED Wires must be extremely aware of _______ Potential.
Touch Potential
Occupants trapped in a vehicle by energized wires may be able to drive the vehicle clear away from the wires. The vehicle should be driven how many feet clear of the wires?
35 ft.
If a vehicle is on fire or is in a position where an exigent life threatening situation exists (such as dangling off a freeway overpass) the people inside should attempt to _____ _______.
self extricate
The TWO methods for removing oneself from an energized vehicle are:
- Jump or leap without touching the vehicle keeping both feet together and taking small ____ from the car.
- Jump from the vehicle without touching it and _________ your feet together.
- hops
2. shuffling
Rescues from Power Poles / Transmission Lines:
If the victim is alive, use a _________ to instruct him not to move since it is safest for him to remain in place. The power company can usually de-energize power lines in ___ to ____ minutes.
loudspeaker
5 to 10 min.
While climbing a Tower: A charge of static electricity may build up in a person’s body and this charge is capable of jumping up to ___ or ___ inches.
2 or 3 in.
Wildland Fires:
Maintain a minimum safe distance of ___ ft. away from Transmission TOWERS.
Maintain a minimum clearance of ___ ft. beyond the outermost wire of Trasmission LINES.
35 ft.
100 ft.
Wildland Fires:
- Never direct hose streams at high voltage wires.
- Keep hose streams below the ______ of the individual operating it.
- Never direct hose streams into Heavy Plumes of Smoke within ____ ft. of high voltage wires.
- height
- 100 ft.
Smoke from an Electrical VAULT or MANHOLE fire is both ______ and potentially _________ because the fire is most likely burning conduit and is oxygen starved. Any spark from power tools can cause serious or deadly hazards to rescuers.
toxic
explosive
What is the EXPLOSIVE RANGE for Carbon Monoxide (CO)?
___ to ___ %
12.5 to 74 %
Upon arrival at an Electrical VAULT or MANHOLE fire, care must be taken on where the apparatus is placed. No emergency vehicle should stop OVER or within CLOSE PROXIMITY to Manholes. Consider spotting ________ of the incident to remain clear of hazardous gasses.
upwind
Manhole Covers:
- Weight: ____ lbs
- Have been blown ____ ft. into the air.
- Distance of ____ ft.
- 300 lbs
- 75 ft. into air
- 125 ft.
Always locate the nearest Manhole Covers in all ____ directions from the involved vault or manhole because there is a strong possibility of nearby manhole covers “blowing” if they are connected to the same shaft.
four
Who shall insure all occupancies adjacent to the involved Vault are inspected for hazards?
I.C.
When members are conducting searches of adjacent structures on VAULT Fires, all _____ shall be worn and utilized.
PPE
MANHOLE / VAULT Fires:
Because the ___ may disperse via conduit, it can find its way into nearby void spaces and buildings causing health and explosion hazards to anyone within the building or room.
Carbon Monoxide (CO)
Wires on POLES shall NOT be cut by firefighters unless there is an immediate _____ hazard. In that event, cutting must be confined to ____ voltage wires.
life
Low
LADWP tests Rubber Gauntlet Gloves to _____ volts every ___ days.
10,000 volts
60 days
When cutting the LOOPS at the Service Head. Cut the _______ conductor first. (Do Not reach over charged wires).
Closest
If an apparatus contacts a Live Conductor and it is necessary to jump. Get ______ the Running Board Cable and jump off.
above
Gas may be formed in the MANHOLE as a result of burning ________ or ____ . (which may be toxic or explosive).
insulation or oil
Tell Tale Signs of an ELECTRICAL ROOM of VAULT:
- Heavy ______ Doors
- ________ Locks
- Heavy ______ Locks
- __________ form the building supervisors or engineers.
- Heavy Steel Doors
- Multiple Locks
- Heavy Duty Locks
- Information
Never put ______ into a VAULT. Use only non-conducting __________ and only when requested to do so by a qualified DWP representative.
water
extinguishers
A SQUARE manhole indicates what kind of Vault?
Transformer
This is the fuse between the main line and transformer. If the transformer “shorts out” this fuse should cut off the electrical current (similar to a switch panel).
Oil Fuse Cutout
The main Fire Hazard within electrical Vaults is the _______ oil used in transformers which has a FLASHPOINT of ____ degrees.
cooling
300 deg.
Location of the cables in a VAULT is no longer an indication of voltage. High Voltage cables up to ________ volts may be located close to the floor inside conduit containing ____ psi oil pressure.
230,000 volts
200 psi
