T.B. 8 - Electrical Hazards: Saftey & Operations

Question 1

HIGH VOLTAGE is from _____ to _____ volts?

Answer 1

600 to 59,999 volts

Question 2

Extremely High Voltage is in excess of how many volts?

Answer 2

60,000 volts

Question 3

Streetlights can be fed by conductors carrying ____ to ____ volts.

Answer 3

120 to 6,150 volts

Question 4

LADWP considers Streetlights to be energized and _____ voltage at all times.

Answer 4

High

Question 5

Water is NOT a good conductor but there are TWO factors that can increase conductivity :

1. _______ ________
2. __________

Answer 5

Dissolved Minerals

Impurities

Question 6

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).

Answer 6

• 30 degrees
• 33 ft.
• 100 psi

Question 7

What is the 30/33/100 Rule consist of?

Answer 7

30 degrees, 33 ft. away, 100 psi for hose streams

Question 8

LADWP recommends not approaching a HIGH VOLTAGE source closer than one’s _____ ______.

Answer 8

body length

*so that a fall forward will not cause direct body contact

Question 9

A minimum of how many horizontal strands of barrier tape should be used for Life Hazard Zones?

Answer 9

3 strands

Question 10

Firefighters responding to incidents in which individuals are trapped by DOWNED Wires must be extremely aware of _______ Potential.

Answer 10

Touch Potential

Question 11

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?

Answer 11

35 ft.

Question 12

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 _____ _______.

Answer 12

self extricate

Question 13

The TWO methods for removing oneself from an energized vehicle are:

1. Jump or leap without touching the vehicle keeping both feet together and taking small ____ from the car.
2. Jump from the vehicle without touching it and _________ your feet together.

Answer 13

1. hops

2. shuffling

Question 14

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.

Answer 14

loudspeaker

5 to 10 min.

Question 15

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.

Answer 15

2 or 3 in.

Question 16

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.

Answer 16

35 ft.

100 ft.

Question 17

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.

Answer 17

• height

- 100 ft.

Question 18

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.

Answer 18

toxic

explosive

Question 19

What is the EXPLOSIVE RANGE for Carbon Monoxide (CO)?

___ to ___ %

Answer 19

12.5 to 74 %

Question 20

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.

Answer 20

upwind

Question 21

Manhole Covers:

• Weight: ____ lbs
• Have been blown ____ ft. into the air.
• Distance of ____ ft.

Answer 21

• 300 lbs
• 75 ft. into air
• 125 ft.

Question 22

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.

Answer 22

four

Question 23

Who shall insure all occupancies adjacent to the involved Vault are inspected for hazards?

Answer 23

I.C.

Question 24

When members are conducting searches of adjacent structures on VAULT Fires, all _____ shall be worn and utilized.

Answer 24

PPE

Question 25

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.

Answer 25

Carbon Monoxide (CO)

Question 26

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.

Answer 26

life Low

Question 27

LADWP tests Rubber Gauntlet Gloves to _____ volts every ___ days.

Answer 27

10,000 volts 60 days

Question 28

When cutting the LOOPS at the Service Head. Cut the _______ conductor first. (Do Not reach over charged wires).

Answer 28

Closest

Question 29

If an apparatus contacts a Live Conductor and it is necessary to jump. Get ______ the Running Board Cable and jump off.

Answer 29

above

Question 30

Gas may be formed in the MANHOLE as a result of burning ________ or ____ . (which may be toxic or explosive).

Answer 30

insulation or oil

Question 31

Tell Tale Signs of an ELECTRICAL ROOM of VAULT: 1. Heavy ______ Doors 2. ________ Locks 3. Heavy ______ Locks 4. __________ form the building supervisors or engineers.

Answer 31

1. Heavy Steel Doors 2. Multiple Locks 3. Heavy Duty Locks 4. Information

Question 32

Never put ______ into a VAULT. Use only non-conducting __________ and only when requested to do so by a qualified DWP representative.

Answer 32

water extinguishers

Question 33

A SQUARE manhole indicates what kind of Vault?

Answer 33

Transformer

Question 34

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).

Answer 34

Oil Fuse Cutout

Question 35

The main Fire Hazard within electrical Vaults is the _______ oil used in transformers which has a FLASHPOINT of ____ degrees.

Answer 35

cooling 300 deg.

Question 36

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.

Answer 36

230,000 volts 200 psi