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1-2 > Shock, Arc, and Blast > Flashcards

Shock, Arc, and Blast Flashcards

1
Q

Who work with electricity directly

A

Engineers and Qualified Electrical workers

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2
Q

who works with electricity indirectly

A

office workers and sales person

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3
Q

statistic of lineman incidents in 2004

A

number of incidents# 50

Fatalities # 40

Hospitalized # 16

non-hospitalized # 2

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4
Q

tostatistic of lineman incidents between 1995 to 2003

A

number of incidents# 552

Fatalities # 383

Hospitalized # 213

non-hospitalized # 26

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5
Q

Are all fatalities and injuries preventable

A

Yes

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6
Q

What are the hazards associated with electricity

A

Shock

Arc

Blast

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7
Q

Electricity flow of pressure

A

is measure in volts

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8
Q

Electricity flow of resistance

A

is measure in ohms

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9
Q

measure of ohm is dependent on 3 factors

A

the nature of the substance itself,

the length and cross-sectional area of the substance,

the temperature of the substance.

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10
Q

substance that offers resistance are

A

porcelain

polymers

plastics

bakelite,

dry wood

note these are insulator

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11
Q

the relationship between resistance current and voltage

A

Ohms law

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12
Q

What is the ohms law formula

A

Current = voltage divided by resistance (I = ER)

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13
Q

What is the human body resistance

A

1)Hand to hand: 1,000 ohms
2)120 volts
3)Formula I = ER
4)120/1,000 = 0.120 amperes or 120 mA

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14
Q

How does electivity travels

A

it travels in a close circuit.

note it takes any path available to complete a circuit

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15
Q

How does shock occurs

A

it happens when the body become part of the circuit that electricity travels through.

note it enter one part of the body and leaves in another

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16
Q

There 3 ways that shock normally occurs

A

the individual must come in contact with both wires of the electrical circuit

one wire of the electric circuit and the ground

a metallic part that has become “hot” by being in contact with an energized wire while the individual is also in contact with the ground

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17
Q

what is the body cover by

A

Skin is made up of 3 layer

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18
Q

What is the most important layer of the skin

A

The outer layer which is made up of dead skin is called the horny layer

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19
Q

What is the outer skin made up

A

Its made from a protein called keratin

20
Q

what can drop the resistance of the horny layer

A

when the skin is moist or when it has an abrasion such as a cut

20
Q

What provide the human body largest resistance from electricity

A

Keratin

21
Q

At what volts does the skin get punctured

A

600 Volts

22
Q

What are the volts of a Power distribution systems

A

They usually are 480 volts or higher

23
Q

what causes the blood to flow

A

The contraction of the blood muscles

24
Q

What makes muscles to contract

A

electrical impulses

25
Q

At what milliamperes can the rhythmic of the heart stops

A

75 milliamperes

26
Q

how do electric impulses travel

A

through the nerves

27
Q

What are the 3 things that affects the severity of the shock are

A

-The amount of current flowing through the body
(measured in amperes)

-The path that current flows through the body

-The length the body is in the circuit

28
Q

Apart of the main 3 what are other severity that affects the body

A

-The frequency of the current

-Phase of the heart when the shock happened

-General person health

29
Q

What is the common related injury

A

A Burn

30
Q

What are the 3 types of burn that happens in an electrical accident

A

-Electrical burns

-Arc Burns

Thermal Contact burns

31
Q

Metal arcing of metal can reach what temperature

A

Up to 35,000 Freiheit

note: Four times hotter than the sun

32
Q

What causes electric arc

A

It happens due to poor electrical contact or insulation by the passage of substantial amounts of current through the vaporized terminal material such as metal or carbon

33
Q

How does a blast happen

A

By the pressure made of the heating of air surrounding the arc and the expansion of the metals as its vaporized

34
Q

what the hazard associated with blast

A

It can hurl people, switch gear and cabinet with great distance

35
Q

What is a benefit of a blast

A

can hurl nearby personnel alway from the arc

36
Q

When a hazard cant be remove what do you need to work around it

A

You need Personal Protective equipment

37
Q

What you need to do in order to have the proper PPE for the job

A

Hazard assessment

38
Q

What is the NFPA 70E

A

Standards that specified the amount and type of PPE needed for an hazard

39
Q

In order for rubber material to be valid to use for hazard what it to pass through

A

ANSI standards in their manufacture and subsequent electrical testing

40
Q

1 milliampere

A

Perception level. Just a faint tingle.

41
Q

5 milliamperes

A

Slight shock felt; not painful but disturbing. Average individual can let go. However, strong involuntary reactions to shocks in this range can lead to injuries.

42
Q

6 to 25 milliamperes (women)

9 to 30 milliamperes (men)

A

Painful shock, muscular control is lost. This is called the freezing current or “let-go” range.

43
Q

50 to 150 milliamperes

A

Extreme pain, respiratory arrest, severe muscular contractions.* Individual cannot let go. Death is possible.

44
Q

1,000 to 4,300 milliamperes

A

Ventricular fibrillation. (The rhythmic pumping action of the heart ceases.) Muscular contraction and nerve damage occur. Death is most likely.

45
Q

10,000 milliamperes

A

Cardiac arrest, severe burns, and probable death.

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