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Engineer Study Program Training Bulletins > Training Bulletin 8 > Flashcards

Training Bulletin 8 Flashcards

1
Q

How many electrical deaths in the US each year?

A

700

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2
Q

What percent of worker deaths are by electricution?

A

12%

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3
Q

How many deaths in the fire service from electrocution?

A

25

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4
Q

How many electrical emergencies does the LAFD respond to annually?

A

3000

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5
Q

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

A

High to low

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6
Q

What is extremely high voltage?

A

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

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7
Q

What is high voltage?

A

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

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8
Q

What is low voltage?

A

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

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9
Q

How many transformers in the ladwp system?

A

Over 50,000

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10
Q

How many poles in the ladwp system?

A

over 250,000

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11
Q

How many substructures and switches?

A

Over 1000

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12
Q

How many volts do generation facilities generate?

A

Between 4000 and 20,000

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13
Q

How many volts can step up transformers produce?

A

Over 1,000,000 volts

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14
Q

What is the voltage range for transmission lines?

A

69kv to 1000kv

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15
Q

What voltages come into la?

A

230kv

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16
Q

How long are insulators on transmission lines?

A

3-20’

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17
Q

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

A

3 Times

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18
Q

Distribution lines

A

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

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19
Q

Overhead distribution system

A

Consists of wires mounted on steel or wood poles.

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20
Q

Underground lines

A

Lines inserted in conduits or ducts and buried in ground

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21
Q

How many receiving stations does the LADWP have?

A

21 stations

22
Q

What is sub-transmission voltage?

A

34.5kv

23
Q

How many distribution stations are there?

A

150

24
Q

What does the distribution station step it down to?

A

34.5kv to 4.8kv.

25
Q

How many consumers does a primary have?

A

750 consumers

26
Q

How many primary circuits does the LADWP have?

A

Over 1500 Primaries.

27
Q

How many amps does it take to kill a human?

A

1/10 of an amp for 2 seconds

28
Q

How many amps before you loose control of your muscles?

A

10 milliamps mA

29
Q

How many amps before respiratory paralysis?

A

30 miliamps

30
Q

How many amps before vfib?

A

75 miliamps

31
Q

How many amps before Heart paralysis?

A

4 amps

32
Q

How many amps before tissue is burned?

A

5 amps

33
Q

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

A

10 Feet

34
Q

How many volts can communication wires have

A

Up to 50 volts

35
Q

How many volts can street lights contain?

A

120-6150 volts

36
Q

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

A

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

37
Q

How do you identify a life hazard zone?

A

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

38
Q

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

A

35 feet

39
Q

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

A

5-10 minutes

40
Q

How far should you keep from transmission towers?

A

35 feet

41
Q

How much clearance from wires?

A

100 feet from farthest out wire

42
Q

How far should you stay from downed wires?

A

The span between two poles

43
Q

What is the explosive range for co?

A

12.5% to 74%

44
Q

How far can manhole covers fly?

A

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

45
Q

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

A

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

46
Q

How and when are Gauntlet gloves tested?

A

10,000 volts every 60 days

47
Q

What does a square manhole indicate?

A

A transformer vault

48
Q

What is an oil fuse cutout?

A

The fuse between main line and transformer.

49
Q

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

A

300 F

50
Q

Where can you find high voltage cables in a vault?

A

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

Engineer Study Program Training Bulletins (22 decks)

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