TB 008- Electrical Hazards Flashcards
NIOSH Reports- Electrical incidents account for _____ deaths a year
700+
Electrical accidents account for ____% of worker deaths annually
12%
LAFD responds to ______ electrocutions, wires down, and other electrical emergencies annually
3000+
What is the current flow of electricity?
Amps— GPMs
_____ is the Difference of electrical potential between two points in a circuit
Volts (PSI)
The _____ determines how much current will flow through a component
OHMs- resistance or friction loss
The amount of current the voltage level at any given point
Watts
Transmission voltage or “extremely high”
60,000+ volts
Primaries or “High Voltage”
600-59,999 volts
LADWP primary distribution voltage
4.8kV
Secondaries or low voltage
<600 volts
Generation systems (hydro, mechanical, nuclear) create _____ volts
4000- 20,000 volts
“______ “ are used to take electricity from generation plants over long distances, sometimes “_______” voltage to ______ in order to deliver flow where it needs to go
“Switchyards”, “Stepping up”, 1 million+ volts
_______ lines carry electricity from generation stations through wires to the grid and range from _____-_____ volts. LAADWP common= _______ volts
Transmission lines, 69kV- 1000kV. LADWP common= 69kV
Insulators range from ____-____ feet
3-20 feet
What happens at distribution system/ station?
Electricity is stepped down from 138kV-500kV to34.5kV for consumer distribution. Then at sub- station again from 34.5kV- 4.8kV
How many consumers does each “primary circuit” average?
750 consumers
Overhead/ pole mounted transformers do what?
Step- down voltage from 4.8kv- 120/240 volts for most residential consumers
What are the 4 types of electrical injuries?
1) electrocution (death)
2) shock
3) Burns
4) falls
________ of an AMP of electricity to the body for ______ seconds is enough to cause death
1/10, 2 seconds
Currents above _______ milliAmps can paralyze or “_____” muscles
10 milliAmps, “freeze”
People have stopped breathing from currents as low as ____ Volts
Usually about _____ AMPs can cause respiratory paralysis
Currents greater than _____ milliAMPs may cause V-Fib
49 volts
30 MilliAMPs
75 MilliAMPs
What is the most important factor in resuscitation of pt’s in cardiac arrest from electricity?
Early defibrillation
Voltage of street lights
120- 6150 volts
What is the 30/33/100 rule?
Fog stream set to 30 degrees
33 feet away
Minimum 100 psi to nozzle
What is the flashpoint for the cooling oils which are the main fire hazard within electrical vaults?
Below 300 degrees
