TB 8 Electrical Hazards at fire

Question 1

how many deaths per year from electrical hazards?

what % are workers?

Answer 1

700
25%

Question 2

Define AMPS

Answer 2

current flow
*Comparable GPM

Question 3

Define Volts

Answer 3

electric potential between two points
* Comparable PSI

Question 4

Define OHMS

Answer 4

relationship between (watts), voltage (volts), current (amps) and Resistance (ohms)
Watts = Amps x Volts
Amps = Watts / Volts
Volts = Watts / Amps

Question 5

define watts

Answer 5

amps x volts

Question 6

extremely high volts

Answer 6

excess of 60000 volts

Question 7

high volts

Answer 7

600 to 59,999 volts (usually found in customer distribution system = “primaries” typical 4,800

Question 8

Low voltage

Answer 8

below 600 volts

Question 9

what is generation system

Answer 9

where the power is made (4,000 – 20,000 volts)

Question 10

transmission insulators are how long?

Answer 10

3-20ft long

Question 11

how many receiving stations dose LADWP have?

Answer 11

21

Question 12

receiving stations take voltages from 138kv to 500kv and reduce it to?

Answer 12

34.5kv

Question 13

LADWP has 150 distribution stations that take the 34.5kv and reduces it to?

Answer 13

4.8kv

Question 14

how far should the aerial ladder be kept from power lines?

Answer 14

10 ft

Question 15

what can communication lines be charged to?

Answer 15

50volts

Question 16

how many volts are run to streetlights?

Answer 16

120-6150 volts

Question 17

how far away from affected pole should you spot apparatus?

Answer 17

1 span (which is distance of two poles)

Question 18

how long does it take LADWP to deenergize lines?

Answer 18

5-10 mins