Electrical Fires TB 08

Question 1

Definition of AMPs -

Answer 1

Current flow, from high voltage to low voltage,

Compared to GPMs

Question 2

Definition of Volts

Answer 2

Difference in electrical potential between 2 points, pressure behind current flow, PSI

Question 3

Def of OHMs

Answer 3

Resistance determines how much current will flow through a component

Question 4

Extremely high voltage

Answer 4

60,000 volts

Question 5

High voltage

Answer 5

600-59,999v

Question 6

Low voltage

Answer 6

Below 600v

Question 7

Voltage on transmission lines range from

Most are ___v

Answer 7

69kv to 1000kv

Most are 230kv

Question 8

Strings of insulators how long

Answer 8

3-20ft long

Question 9

Receiving stations reduce transmission voltages down to how many kv?

Answer 9

34.5kv

Question 10

Distribution stations reduce 34.5kv to?

Answer 10

4.8kv (primary circuit voltage )

Question 11

Each primary circuit voltage (primary lines) serve how many customers?

Answer 11

750

Question 12

Dangers of capacitors?

Answer 12

Can hold a charge weeks after power has been removed

Question 13

Most effective methods to identify different voltages are:

Answer 13

1. High voltage sign in front of the cross arm
2. Size and shape of the insulator
3. Distance between the conductors

Question 14

How many amps can cause death?

Answer 14

1/10 of an amp for 2 seconds

Question 15

How many mA can control muscles in the arm?
How many mA can cause respiratory paralysis?
How many mA cause ventricular fibrillation?

Answer 15

10mA
30mA
75mA

Question 16

For voltage of 600 or more, OSHA states that aerial ladders be how fat away from power lines?

Answer 16

10ft

Question 17

Overhead communication wires can be energized up to how many volts?

Answer 17

50

Question 18

Streetlights can be fed from conductors carrying how many volts

Answer 18

120-6150

Question 19

What is the 30/33/100 rule?

Answer 19

30 degree fog
33 ft away
100 psi nozzle pressure

Question 20

Occupants trapped in a vehicle should attempt to drive the vehicle how far away from the power lines?

Answer 20

35ft

Question 21

Operations in brush fires near transmission lines:
How many ft away from transmission towers?
How many ft beyond the outermost wire of lines?
How many feet to keep hose streams away from high voltage wires?

Answer 21

35 ft away from towers
100 ft beyond outermost wire
100ft away with hose streams

Question 22

Explosive range for CO is?

Answer 22

12.5 to 74%

Question 23

Manhole covers weigh how many lbs?

Have been blown how hi and how far?

Answer 23

300lbs
75ft high
300ft far

Question 24

24 hour DWP patrolman can usually reach anywhere in the city in how many minutes?

Answer 24

10

Question 25

LADWP tests gauntlet gloves to how many volts and how often?

Answer 25

10,000v and 60 days