TB # 8 ELECTRICAL HAZARDS Flashcards
A COMPARISON OF ELECTRICITY AND THE EQUIVALENT IN FIREGROUND HYDRAULIC TERMS:
AMPERES = ________
GALLONS PER MINUTE
A COMPARISON OF ELECTRICITY AND THE EQUIVALENT IN FIREGROUND HYDRAULIC TERMS:
VOLTS = _______
POUNDS PER SQUARE INCH (PSI)
A COMPARISON OF ELECTRICITY AND THE EQUIVALENT IN FIREGROUND HYDRAULIC TERMS:
OHMS = ______
FRICTION LOSS
A COMPARISON OF ELECTRICITY AND THE EQUIVALENT IN FIREGROUND HYDRAULIC TERMS:
CURRENT = _______
WATER
A COMPARISON OF ELECTRICITY AND THE EQUIVALENT IN FIREGROUND HYDRAULIC TERMS:
CONDUCTOR = _______
HOSE
LOW VOLTAGE
USUALLY BELOW 600 VOLTS
HIGH VOLTAGE
600 VOLTS UP TO 59,999 VOLTS
EXTREMELY HIGH VOLTAGE
EXCESS OF 60,000 VOLTS
GETTING ELECTRICITY TO THE CONSUMER CAN BE BROKEN DOWN INTO 3 SYSTEMS:
GENERATION, TRANSMISSION & DISTRIBUTION
LADWP SYSTEM IS COMPRISED OF OVER __,____ TRANSFORMERS, OVER ___,____ POLES AND ____’S OF SUBSTRUCTURES AND SWITCHES INSTALLED OVER THE LAST __ YEARS.
-50,000 TRANSFORMERS
-250,000 POLES
-1000’S OF SUBSTRUCTURES AND SWITCHES
-70 YEARS
GENERATION FACILITIES GENERATE ELECTRICITY BETWEEN _____ & _____ VOLTS
4,000 & 20,000 VOLTS
TRANSMISSION LINES RANGE FROM ___KV TO OVER ____KV
69KV TO OVER 1000KV
MOST OF THE TRANSMISSION LINES COMING INTO LOS ANGELES ARE ___KV
230KV
ALL VOLTAGES ABOVE __KV ARE REFERRED TO AS TRANSMISSION VOLTAGES
69KV
STRINGS OF INSULATORS ON TRANSMISSION TOWERS CAN RANGE FROM __ FEET TO __ FEET LONG DEPENDING ON THE VOLTAGE
3FT - 20 FT
THE LADWP HAS A NUMBER OF TRANSMISSON LINES WITH VOLTAGES OF ___KV OR ___KV
138KV OR 230KV
LADWP HAS __ RECEIVING STATIONS
21
LADWP RECEIVING STATION RECEIVES THE ELECTRICITY AT TRANSMISSION VOLTAGES AND STEP THE VOLTAGE DOWN TO ____KV
34.5KV
LADWP HAS OVER ___ DISTRIBUTION STATIONS
150
DISTRIBUTION STATIONS STEP DOWN ELECTRICITY TO ___KV
4.8KV
4.8KV IS KNOWN AS A PRIMARY CIRCUIT VOLTAGE. EACH PRIMARY HAS AN AVERAGE OF ___ CONSUMERS
750
LADWP HAS OVER ____ PRIMARY CIRCUITS
1500
OVERHEAD TRANSFORMERS ARE INSTALLED ON THE 4.8KV CIRCUITS TO STEP THE VOLTAGE DOWN TO _____
120/240 VOLTS
CONDUCTORS ARE MATERIALS THAT…
ALLOW AN ELECTRIC CURRENT TO FLOW THROUGH THEM EASILY
INSULATORS ARE APPLIANCES WHICH WILL…
PREVENT FLOW OF ELECTRICITY (GLASS OR PORCELAIN)
SERVICE CONNECTION ARE WIRES THAT CONNECT THE CONSUMER OR HOME TO THE SECONDARY TRANSFORMER. THE MOST COMMON IS THREE-WIRE METHOD, WHERE THREE WIRES ARE TWISTED AROUND EACH OTHER, KNOWN AS ______.
TRIPLEX
FIREFIGHTERS RESPONDING TO EMERGENCIES INVOLVING ELECTRICAL EQUIPMENT MUST WEAR…
FULL TURNOUTS
THERE ARE 2 MAIN METHODS FOR DE ENERGIZING A BUILDING…
1: OPENING THE MAIN SWITCH OR BREAKER SWITCHES AT ELECTRICAL PANEL
#2: CUTTING WIRES UTILIZING LAFD EQUIPMENT
THE CUTTING OF WIRES BY FIREFIGHTERS MUST BE CONFINED TO ____ VOLTAGE WIRES
LOW VOLTAGE
WHEN CUTTING LOW VOLTAGE WIRES AT THE DRIP LOOP USING MECHANICAL AXE AND GAUNTLET GLOVES, CUT THE ________ CONDUCTOR FIRST.
CLOSEST (TO PREVENT REACHING OVER CHARGED WIRES)
THE LOOPS SHOULD BE CUT AT THE SERVICE HEAD. IF IT IS NECESSARY TO CUT AT THE POLE, CUT ____ WIRE AT A TIME BEFORE IT GOES INTO THE TRIPLEX
ONE
PIKE POLES, RUBBISH HOOKS, OR OTHER TOOLS SHOULD NOT BE USED TO CONTACT ENERGIZED EQUIPMENT
TRUE/FALSE
TRUE
FOR VOLTAGES OF 600 OR MORE, CAL/OSHA & NFPA STANDARDS REQUIRE THAT AERIAL LADDERS BE OPERATED AT A MINIMUM CLEARANCE OF __ FT OF POWER LINES AND ELECTRICAL DEVICES
10 FT
OVERHEAD COMMUNICATION CABLE NORMALLY FOUND ON THE LOWEST LEVEL OF A POWER POLE CAN BE ENERGIZED WITH UP TO __ VOLTS
50 VOLTS
WHEN RESPONDING TO DOWNED OVERHEAD WIRES, HAVE RESPONDING PERSONNEL MAINTAIN THE DISTANCE BETWEEN 2 UNDAMAGED POLES FROM THE AFFECTED WIRE OR POLE
TRUE/FALSE
TRUE
ACCORDING TO TRAINING BULLETIN #8, STREETLIGHTS CAN BE FED FROM CONDUCTORS CARRYING ____-____ VOLTS OR MORE
120 - 6150 VOLTS
30/33/100 RULE
30-DEGREE FOG PATTERN
33FT FROM ENERGIZED SOURCE
100PSI MINIMUM
THE CLEARLY IDENTIFIED METHOD TO ASSURE THAT FIRE PERSONNEL AND OTHER RESPONDERS DO NOT ENTER LIFE HAZARD ZONES INCLUDES THE USE OF A MINIMUM OF __ HORIZONTAL STRANDS OF BARRIER TAPE THAT STATE “DO NOT ENTER” OR “DO NOT CROSS”
3 HORIZONTAL STRANDS
OCCUPANTS TRAPPED IN A VEHICLE BY ENERGIZED WIRES SHOULD REMAIN IN THEIR VEHICLE UNTIL THE POWER IS DE ENERGIZED. HOWEVER, THEY MAY BE ABLE TO DRIVE THE VEHICLE CLEAR OF WIRES. THE VEHICLE SHOULD BE DRIVEN CLEAR OF THE WIRES BY AT LEAST ___ FT.
35 FT
INSTRUCTING VICTIMS TO EXIT A CHARGED VEHICLE IS VERY DANGEROUS AND SHOULD BE DONE ONLY WHEN A LIFE-THREATENING EMERGENCY EXISTS
TRUE/FALSE
TRUE
FIREFIGHTERS AND FIRST RESPONDERS MUST REMAIN AWAY FROM A CHARGED VEHICLE AND RESIST THE URGE TO APPROACH OR GRAB THE VICTIM
TRUE/FALSE
TRUE
MANHOLE COVERS OFTEN WEIGH ___LBS AND HAVE BEEN BLOWN ___FT INTO THE AIR AND A DISTANCE OF ___FT.
300LBS
75FT INTO THE AIR
125FT OUT
THE LADWP TESTS GLOVES TO ______ VOLTS EVERY ___ DAYS
10,000 VOLTS EVERY 60 DAYS
A SQUARE MANHOLE INDICATES A…
TRANSFORMER VAULT
THE MAIN FIRE HAZARD WITHIN ELECTRICAL VAULTS LIES IN THE COOLING OIL USED IN THE TRANSFORMERS, WHICH HAS A FLASHPOINT BELOW ___°F
300°F
