TB 008- Electrical Hazards

Question 1

NIOSH Reports- Electrical incidents account for _____ deaths a year

Answer 1

700+

Question 2

Electrical accidents account for ____% of worker deaths annually

Answer 2

12%

Question 3

LAFD responds to ______ electrocutions, wires down, and other electrical emergencies annually

Answer 3

3000+

Question 4

What is the current flow of electricity?

Answer 4

Amps— GPMs

Question 5

_____ is the Difference of electrical potential between two points in a circuit

Answer 5

Volts (PSI)

Question 6

The _____ determines how much current will flow through a component

Answer 6

OHMs- resistance or friction loss

Question 7

The amount of current the voltage level at any given point

Answer 7

Watts

Question 8

Transmission voltage or “extremely high”

Answer 8

60,000+ volts

Question 9

Primaries or “High Voltage”

Answer 9

600-59,999 volts

Question 10

LADWP primary distribution voltage

Answer 10

4.8kV

Question 11

Secondaries or low voltage

Answer 11

<600 volts

Question 12

Generation systems (hydro, mechanical, nuclear) create _____ volts

Answer 12

4000- 20,000 volts

Question 13

“______ “ are used to take electricity from generation plants over long distances, sometimes “_______” voltage to ______ in order to deliver flow where it needs to go

Answer 13

“Switchyards”, “Stepping up”, 1 million+ volts

Question 14

_______ lines carry electricity from generation stations through wires to the grid and range from _____-_____ volts. LAADWP common= _______ volts

Answer 14

Transmission lines, 69kV- 1000kV. LADWP common= 69kV

Question 15

Insulators range from ____-____ feet

Answer 15

3-20 feet

Question 16

What happens at distribution system/ station?

Answer 16

Electricity is stepped down from 138kV-500kV to34.5kV for consumer distribution. Then at sub- station again from 34.5kV- 4.8kV

Question 17

How many consumers does each “primary circuit” average?

Answer 17

750 consumers

Question 18

Overhead/ pole mounted transformers do what?

Answer 18

Step- down voltage from 4.8kv- 120/240 volts for most residential consumers

Question 19

What are the 4 types of electrical injuries?

Answer 19

1) electrocution (death)
2) shock
3) Burns
4) falls

Question 20

________ of an AMP of electricity to the body for ______ seconds is enough to cause death

Answer 20

1/10, 2 seconds

Question 21

Currents above _______ milliAmps can paralyze or “_____” muscles

Answer 21

10 milliAmps, “freeze”

Question 22

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

Answer 22

49 volts
30 MilliAMPs
75 MilliAMPs

Question 23

What is the most important factor in resuscitation of pt’s in cardiac arrest from electricity?

Answer 23

Early defibrillation

Question 24

Voltage of street lights

Answer 24

120- 6150 volts

Question 25

What is the 30/33/100 rule?

Answer 25

Fog stream set to 30 degrees 33 feet away Minimum 100 psi to nozzle

Question 26

What is the flashpoint for the cooling oils which are the main fire hazard within electrical vaults?

Answer 26

Below 300 degrees