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NCCER ELECTRICAL LEVEL 1 > Safety For Electricians > Flashcards

Safety For Electricians Flashcards

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1
Q

OSHA name for the most Dangerous things on Job sites.

A

Focus Four or Fatal Four
Page 28

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2
Q

What percent age of Deaths are caused by the Fatal Four

A

90%
Page 28

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3
Q

Fatal Four and include the following

A

Page 28
• Fall hazards - Falling from heights
• Electrical hazards — Electric shock and burns from touching energized electrical conductors
• Caught-in or -between hazards - Being crushed by falling materials or equipment
• Struck-by hazards - Being hit by flying objects or moving equipment, such as trucks, forklifts, and other construction equipment

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4
Q

What is electric current

A

Page 28

Electricity is something that causes electrons to move in a conductor. This
aluminum are good conductors.
movement is called electric current. Metals such as silver, copper, steel, and

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5
Q

Is a human body a conductor

A

Yes

Page 29

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6
Q

What is a mA

A

The unit of measure represented by mA is a milliampere (or milliamp). One milliampere is equal to one thousandth of an ampere.

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7
Q

Who does the current of 1 mA (0.001A) affect the human body?

A

Page 29
Shock that can be felt, like a little tingling

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8
Q

How does the current of 5 mA (0.005A) affect the human body?

A

Page 29
Slight shock that may cause you to react by jumping or falling, which may result in injury

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9
Q

Hire does the current of 6-30 mA (0.006-0.030A) affect the human body?

A

Page 29
Painful shock which causes you to lose control of your muscles

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10
Q

How does the current of 50-150 mA (0.050-0.150A) affect the human body?

A

Page 29
Extreme pain and severe muscle contractions which may cause you to stop breathing and possibly die

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11
Q

How does the current of 1,000-4,300 mA (1-4.3A) affect the u human body?

A

Page 29
Dangerous heartbeat pattern, severe muscle cramping, and nerve damage, from which you will likely die

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12
Q

What a Double-insulated/ungrounded tools?

A

Page 30
Double-insulated/ungrounded tools:
Electrical tools that are constructed so that the case is insulated from electrical energy. The case is made of a nonconductive material.

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13
Q

What’s a Ground Fault Circuit Interrupter
(GFCI)?

A

Page is 30
Ground Fault Circuit Interrupter
(GFCI): A device that protects people and equipment by de-energizing a circuit within an established period of time when a ground fault current exceeds the values established for a Class A device (4-6 mA).

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14
Q

What High Voltage??

A

More the 1,000V
Page 30

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15
Q

What’s this symbol

A

Ohms

Page 31

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16
Q

What is a shock

A

When a human body become part of an electrical current..

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17
Q

what is the Hand to hand resistance?

A

1000 ohms

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18
Q

when a current enter the body how does it leave?

A

it enter in one place and leaves out another

page 31

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19
Q

what level of voltage is the number you should start using protection?

A

50 volt of higher

page 31

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20
Q

what 3 parts of the body do electrical currents effect ??

A

Skin, heart, body

page 31

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21
Q

what protein in the body provide the body with electrical resistance?

A

keratin
page32

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22
Q

what can happen when the heart receives out side electrical shock

A

page32
the heart can stop beating and quiver instead in a process called fibrillation.

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23
Q

what can happens to the muscle when shocked

A

page32
the could lose control of there muscle because of shock to the nervous system. and this is why some people cant let go of the things that is shocking them sometime.

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24
Q

what is the most common injury people get when the get shocked

A

BURNS
Page 33

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25
what are the types of Burn
Page 33 * electrical Burns * Arc Burn * thermal contact Burns
26
what is a electrical burn
Page33 the heat from the electical current burns you from the inside out.
27
what is a Arc
Page 33 when a electrical current jumps through the air from one part of the circuit to another. (When you touch that its call ARC BURN)
28
how hot can metal from a arc get
page 33 35000f (4 times hotter then the sun
29
how can electric arcs happen
Page 33 because of bad Electrical contact or poor insulation/ or when a current flow through a vaporized terminal material like carbon of metal
30
what's is OHM's law?
page 33 a way to figure out one of 3 thing in a Electrical system. Voltage, Current, and resistance.
31
what is (E)?
page 33 Voltage (E) - A measure of difference of electric potential.
32
what is (I)
Page 33 Current (I) — A movement of electrons.
33
Whats is (R)
Page 33 Resistance (R) - A material's opposition to the flow of electric current.
34
how do you find the VOLTAGE?
Page 33 To find the voltage, multiply the current by the resistance using the following formula: Ix R= E
35
how do you find the Current?
Page 33 To find the current, divide the voltage by the resistance using the following formula: E/R=I
36
how do you find the Resistance?
To find the resistance, divide the voltage by the current using the following formula: E/I=R
37
what is a thermal Contact Burn?
Page 34 Thermal contact burns can happen when someone touches a hot object thrown during a blast from an electric arc. If you are in the way of a flying piece of molten metal, you may get a thermal contact burn.
38
what are the primary Hazard Associated with blast from an Electric Arc.
Page 34 1. Sound and Pressure Waves (hearing) 2. Intense Light 3. Shrapnel (impaled 4. vaporized copper (inhaled) 5. molten metal 6. out air,
39
when must a person when must a something be be marked quality person only?
Page 34 NEC Section 110.16 requires that all switchboards, switchgear, panelboards, industrial control panels, meter socket enclosures, and motor control centers be clearly marked to warn qualified persons of potential electric arc flash hazards.
40
what is NEC SECTION 110.16(b)
NEC Section 110.16(B) requires a permanent arc flash label be field or factory supplied to service or feeder-supplied equipment rated 1,000A or more.
41
When should you test before touching a electrical conductor
Page 36 Always
42
How do you determine if a circuit is energized?
Live - dead- live test
43
What are the 3 primary causes of Electrical incidents
• Unsafe conditions • Unsafe equipment • Unsafe actions
44
What is Cfr
When you see the letters CFR, then you know you are looking at OSHA regulations.
45
List some of the most common safety equipment
• V-rated tools • Tested rubber protective equipment, including gloves, sleeves, and blankets • Arc-rated apparel • Natural fiber clothing for underlayers • Electrical hot sticks • Fuse pullers • Footwear designed to protect against electrical hazards • Safety glasses • Face shields and switching hoods • Hard hats • Hearing protection
46
What kind of hard hat do you use for High Voltage Hazard.
Class E hard hats have the highest rating and are tested to withstand 20,000VAC for a period of three minutes.
47
What is an Ozone?
Ozone (O3) is a form of oxygen produced from an electrical field. It is in the air surrounding a conductor with high voltages. Normally, you find ozone at voltages of 10 kV and higher. Voltages that high are in electric utility transmission and distribution systems.
48
How many types of Rubber Protective equipment is there?
TYPE 1 VULCANIZED NATURAL AND SYNTHETIC RUBBER TYPE 2 OZONE RESISTANT (MUCH STIFFER NOT EASLIY WORN
49
What are the rubber protective equipment Classifacation For ANSI and (Astm)
Page Class 00 (beige tag) 500VAC/750VDC Class 0 (red tag) 1,000VAC/1,500VDC Class 1 (white tag) 7,500VAC/11,250VDC Class 2 (yellow tag) 17,000VAC/25,500VDC Class 3 (green tag) 26,500VAC/39,750VDC Class 4 (orange tag) 36,000VAC/54,000VDC
50
what is the leather protector of the rubbergloves for
Page 43 Burn protection
51
how do you know your gloves are not inside out
Page 43 serial number and size on the out side
52
how often do rubber gloves have to be checked?
every 6 months
53
wha must you do before wear rubbergloves
Page 44-45 Inspect and Check air check or glove inflator
54
what do Maintenance tech you use to cover equiptment
Page 45 insulated blankets
55
what do maintenance techs use to cove the floors
Page 45 Switchboard matting
56
what type of clothing should you never wear when doing electric work?
Synthetic fibers: acrylic, polster, nylon
57
what is a hot stick?
Page 46 a insulated tool designed for disconnecting switched and removing and inserting switch and applying temp ground and testing. made to provide distance between me and energiezd parts
58
how you de-energies circuit with a capacitors installed?
page 45 with a Discharge probe
59
what are the osha Standard for Employers
Page 48 * OSHA Standard 29 CFR 1910.331 through 1910.335 covers electrical safety-related work practices. * OSHA Standard 29 CFR 1910.332 requires training for all employees exposed to electrical shock.
60
what are the OSHA standard for emplyees
* CFR 1926 — standard for the construction industry * CFR 1910 - standard for general industry
61
CODE: Ground-Fault Protection for Personnel
Page 50 NEC Section 590.6
62
CODE:Splices
Page 50:NEC Section 400.13
63
Code:Flexible Cords and Flexible Cables
page 50 NEC Table 400.4
64
Code:GFCI Protection
page 50 NEC Section 590.6(B)(1)
65
Code:Assured Equipment Grounding Conductor Program
Page 51 NEC Section 590.6(8/(2)
66
How many Chapters are there in NFPA 70E ?
Three * Chapter 1, Safety-Related Work Practices * Chapter 2, Safety-Related Maintenance Requirements * Chapter 3, Safety Requirements for Special Equipment
67
what is Napa 70E specific approach distance limits to exposed eneregized parts called?
Page 58 Approach boundaries
68
An approach distance limit from exposed energized electrical conductors or circuit parts within which a person could receive a second-degree burn if an electric arc flash were to occur.
Arc flash boundary (AFB): page 58
69
: An approach distance limit from an exposed energized electrical conductor or circuit part within which a shock hazard exists.
Limited approach boundary Page 58
70
Restricted approach boundary:
An approach distance limit from an exposed energized electrical conductor or circuit part within which there is an increased likelihood of electric shock.
71
A study investigating a worker's potential exposure to arc flash energy conducted by a qualified worker for injury prevention, determination of safe work practices, and appropriate levels of PPE.
Arc flash risk assessment:
72
how many electrical shock Protection boundaries/ limits of approach are there?
* Limited approach Boundary (for qualified Person only) * Resistricted Approach boundary (for qualified person only and they must have on proper PPE) page 60
73

NCCER ELECTRICAL LEVEL 1 (7 decks)

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