TB 8 Flashcards
Electrical Accidents account for ___ deaths per year
700
Electrocution accounts for ____ percent of worker deaths annually
12
In the past ____ years electrocutions have accounted for more than ____ firefighter deaths
20
25
LAFD responds to over _____ electrical incidents annually
3000
Amps is the ______ and is equivalent to hydraulics_____
Current Flow
GPM
Volts is the currents ______ and equivalent to hydraulics _______
Pressure or push
PSI
OHMS is a measurement of ________
Equivalent to hydraulics _______
Resistance
Friction loss
Ohms Law Equations
Watt= amps x volts
Amps = watts + volts
Volts = watts + amps
Extremely High voltage is ______
Excess of 60,000 volts
Extremely High voltage is ______
Excess of 60,000 volts
High voltage is _______
600 - 59,999 volts
Low voltage is ______
Less than 600 volts
LADWP primaries are usually ________
4.8kvs
Transmission lines range from ______ volts to ________ volts. With most in LA being ______
69kv
1000kv
230kv or higher
Generation systems generate _______ to _______
4000 to 20000
High voltage capacitors can hold charge for
Weeks
Transmission insulator sizes
3-20 feet long
LADWP has some transmission lines at ______ kv to ______ kv
138
230
LADWP has _____ receiving stations
21
Receiving stations receive electricity at ____ to _____ and step down voltage to _____ kv which is known as sub transmission
138 to 500
34.5
Voltage is stepped down ____ times before reaching consumer
3
There are over _____ distribution stations where electricity is received at ______ and stepped down to ______ which is known as _______
150
34.5kv
4.8kv
Primary circuit voltage
LADWP has over ______ primary circuits each with an average of ______ consumers
1500
750
3 Ways of determining high voltage
- High voltage signs on cross arms
- Size and shape of insulators
- Distance between conductors
_____ amps of electricity for ____ seconds can cause death
1/10
2
_____ milliamperes can cause paralysis and muscles to freeze
10
Heart paralysis and damage to organs occurs at ____ amps
4
Tissue is burned at amps greater than
5
4 types of electrical injured
- Electrocution
- Electrical shock
- Burns
- Falls
2 ways to shutdown power
- Main breakers
- Cutting wires
Aerial Ladders are placed a minimum of ___ft from power lines
10
Comm lines can be charged up to
50 volts
Spot apparatus at least ____ away from incident
1 pole span
Streetlight voltage
120-6150
30/33/100 Rule
30 degree fog
33 feet away
100 psi minimum
During rescue vehicle should be driven minimum ____ ft away from source
35
Safe distance from transmission towers on wildland fires
Minimum 35 feet
Minimum 100 feet clearance beyond outermost wire
LADWP can deenergize lines for ____ minutes
5-10
LADWP patrolmen can are on call ____ hours and can reach any part of the city within ____ minutes
24 hours
10 minutes
Explosive range of carbon monoxide
12.5-74 percent
Manhole covers can weigh _____ lbs and can blow ____ feet in air and a distance of ______ feet.
300
75
125
Cooling oil flash point
300 degrees F
Underground high voltage cables up to _____ volts can be located inside conduit containing ____ psi oil pressure
230,000
200
