Training Bulletin 8

Question 1

How many electrical deaths in the US each year?

Answer 1

700

Question 2

What percent of worker deaths are by electricution?

Answer 2

12%

Question 3

How many deaths in the fire service from electrocution?

Answer 3

25

Question 4

How many electrical emergencies does the LAFD respond to annually?

Answer 4

3000

Question 5

Does voltage flow from high to low or low to high?

Answer 5

High to low

Question 6

What is extremely high voltage?

Answer 6

Voltages in excess of 60,000 volts. Usually transmission voltage

Question 7

What is high voltage?

Answer 7

From 600 volts up to 59,999. Usually distribution system. Referred to as the primaries. Usually 4.8kv

Question 8

What is low voltage?

Answer 8

Usually below 600 volts. Usually called secondary circuit voltage. Referred to as secondary.

Question 9

How many transformers in the ladwp system?

Answer 9

Over 50,000

Question 10

How many poles in the ladwp system?

Answer 10

over 250,000

Question 11

How many substructures and switches?

Answer 11

Over 1000

Question 12

How many volts do generation facilities generate?

Answer 12

Between 4000 and 20,000

Question 13

How many volts can step up transformers produce?

Answer 13

Over 1,000,000 volts

Question 14

What is the voltage range for transmission lines?

Answer 14

69kv to 1000kv

Question 15

What voltages come into la?

Answer 15

230kv

Question 16

How long are insulators on transmission lines?

Answer 16

3-20’

Question 17

How many times is the voltage stepped down before getting sent to consumers?

Answer 17

3 Times

Question 18

Distribution lines

Answer 18

Carry electricity from the distribution system to homes, offices etc.

Question 19

Overhead distribution system

Answer 19

Consists of wires mounted on steel or wood poles.

Question 20

Underground lines

Answer 20

Lines inserted in conduits or ducts and buried in ground

Question 21

How many receiving stations does the LADWP have?

Answer 21

21 stations

Question 22

What is sub-transmission voltage?

Answer 22

34.5kv

Question 23

How many distribution stations are there?

Answer 23

150

Question 24

What does the distribution station step it down to?

Answer 24

34.5kv to 4.8kv.

Question 25

How many consumers does a primary have?

Answer 25

750 consumers

Question 26

How many primary circuits does the LADWP have?

Answer 26

Over 1500 Primaries.

Question 27

How many amps does it take to kill a human?

Answer 27

1/10 of an amp for 2 seconds

Question 28

How many amps before you loose control of your muscles?

Answer 28

10 milliamps mA

Question 29

How many amps before respiratory paralysis?

Answer 29

30 miliamps

Question 30

How many amps before vfib?

Answer 30

75 miliamps

Question 31

How many amps before Heart paralysis?

Answer 31

4 amps

Question 32

How many amps before tissue is burned?

Answer 32

5 amps

Question 33

How far must aerial ladders and equipment be kept from power lines?

Answer 33

10 Feet

Question 34

How many volts can communication wires have

Answer 34

Up to 50 volts

Question 35

How many volts can street lights contain?

Answer 35

120-6150 volts

Question 36

What is the rule when using water on or around high voltage?

Answer 36

30/33/100. 30 degree fog, 33 feet away and 100 psi

Question 37

How do you identify a life hazard zone?

Answer 37

3 horizontal strands of barrier tape that state do not enter or do not cross

Question 38

If a vehicle that is touching can be moved, how far should it be moved?

Answer 38

35 feet

Question 39

How quickly can the power company de-energize transmission line towers?

Answer 39

5-10 minutes

Question 40

How far should you keep from transmission towers?

Answer 40

35 feet

Question 41

How much clearance from wires?

Answer 41

100 feet from farthest out wire

Question 42

How far should you stay from downed wires?

Answer 42

The span between two poles

Question 43

What is the explosive range for co?

Answer 43

12.5% to 74%

Question 44

How far can manhole covers fly?

Answer 44

They weigh 300 pounds and have been blown 75 feet into the air and a distance of 125 feet

Question 45

If high voltage wires are down, who do you request?

Answer 45

Water and power line patrolman. Can usually reach any area of the City within 10 minutes

Question 46

How and when are Gauntlet gloves tested?

Answer 46

10,000 volts every 60 days

Question 47

What does a square manhole indicate?

Answer 47

A transformer vault

Question 48

What is an oil fuse cutout?

Answer 48

The fuse between main line and transformer.

Question 49

What is the flash point of the cooling oil in transformers?

Answer 49

300 F

Question 50

Where can you find high voltage cables in a vault?

Answer 50

May be close to the floor in a conduit containing 200 psi oil pressure with 230,000 volts.