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Electrical > Chapter 2: Safety > Flashcards

Chapter 2: Safety Flashcards

1
Q

What is the difference between an electric shock and electrocution?

A

The length of exposure

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2
Q

NEC

A

National Electrical Code. A legal code published by the NFPA (National Fire Protection Agency).

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3
Q

AHJ

A

Authority Having Jurisdiction- An organization, office or individual responsible for enforcing requirements of a code or standard, or for approving equipment, materials, an installation or procedure.

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4
Q

OSHA

A

The Occupational Safety and Health Administration. Enforces code compliance & safety.

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5
Q

GFCI

A

Ground Fault Circuit Interrupter: trips the circuit when it detects over-current or a ground fault. It does this by measuring the voltage and current in the hot and neutral wires. Installed anywhere there is water or moisture (kitchen, bathroom, etc.).

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6
Q

Ground fault

A

An unwanted path to earth.

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7
Q

Grounding wire

A

Minimizes shock if you accidentally touch a live wire: the majority of the charge will go through the wire rather than your body, since positively charged electrons will always take the path of least resistance.

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8
Q

LOTO

A

Lock Out Tag Out (OSHA procedure)

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9
Q

AFCI

A

Arc-Fault Circuit Interrupter

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10
Q

NRTL

A

Nationally Recognized Testing Laboratory is an independent laboratory recognized by OSHA to test products to the specifications of applicable product safety standards

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11
Q

NFPA

A

National Fire Protection Association- publishes the NEC.

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12
Q

NIOSH

A

National Institute for Occupational Safety and Health

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13
Q

Class A fire

A

Common combustibles that burn to (A)sh - wood, paper, etc.

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14
Q

Class B fire

A

Flammable liquids - stored in a (B)arrel

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15
Q

Class C fire

A

(C)ircuit- energized electrical equipment

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16
Q

Class D fire

A

Flammable metals

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17
Q

Why do we handle wires with one hand when possible?

A

To prevent completing the circuit- the charge will go to the ground, decreasing risk of defibrillation.

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18
Q

What mainly determines the severity of a shock?

A

The amount of current.

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19
Q

What conditions affect the severity of a shock?

A

Body size, type of food you ate, humidity, clothing.

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20
Q

Electrical burn

A

A burn caused by contact with an electrical source, which allows an electrical current to pass through the body. The body heats up, causing internal burns.

21
Q

Arc Flash

A

When electricity short-circuits through the air or across inadequate insulation

22
Q

Arc blast

A

The explosion caused by an arc flash

23
Q

What is the first rule of safety?

A

Think first.

24
Q

PPE

A

Personal protective equipment

25
Q

How do you safely use a straight ladder?

A

The distance from the base to the structure should be 1/4 of the height where the ladder touches the structure. If the top of the ladder is taller than the structure, there should be at least 3 feet/rungs extending beyond the point where the ladder touches the structure.

26
Q

Scaffolds higher than — must have a guardrail.

A

10 feet.

27
Q

Effects of 1 mA

A

Felt slightly as a tingle.

28
Q

Effect of 1 mA to 10 mA

A

Muscles contract and prevent victim from releasing charged object.

29
Q

Effect of 10 mA to 100 mA

A

Fatal after several seconds.

30
Q

Effect of 100 mA or more

A

Almost always fatal

31
Q

How do you ground a metal scaffold?

A

Connect a 2 AWG copper conductor between the scaffold and a ground-connecting fixture (such as a ground plate or ground rod).

32
Q

What must you do before excavation?

A

Call 811 to have the underground utility lines marked.

33
Q

Do not used powered excavating equipment within — of utility markings.

A

24 inches.

34
Q

Trenches more than — deep must be reinforced to prevent the walls from caving in.

A

5 feet.

35
Q

Lockout device

A

A safety device that prevents the energizing of a circuit by locking switches, breakers, valves, or enclosures

36
Q

Tagout

A

The identification procedure that is used to let other workers know who applied a lockout.

37
Q

Blockout device

A

Prevents a machine or appliance from automatically turning back on when power is restored.

38
Q

Never — – — — unless absolutely necessary. Always – – – –!

A

Work on energized equipment. Turn the power off.

39
Q

What is the procedure for helping a victim of electric shock?

A

(1) Call for help. (2) Turn off the power source. (3) If you can’t turn off the power immediately, remove the source of electric shock without touching the conductor or the victim. Use a wood stick or other nonconductive or insulated material to separate the conductor from the victim. (4) Talk to the victim in a loud and clear voice to see if they are conscious. (5) If the victim is not breathing, initiate CPR.

40
Q

If you must work in wet conditions, how do you keep yourself safe?

A

(1) Use proper equipment, including insulated tools, PPE, and GFCI protection. (2) Turn the power off.

41
Q

What kind of fumes are hazardous on a job site?

A

Flammable and non-flammable.

42
Q

CPR

A

cardiopulmonary resuscitation

43
Q

When you ground, you ground both the ____ and the _____.

A

Device; box

44
Q

OCPD

A

Over current protective device (circuit breaker)

45
Q

Branch circuit wires

A

Wires running between the circuit breaker and last connected device or receptacle

46
Q

Feeder wires

A

Wires running from the service equipment or other power source (eg solar panel) to the main branch circuit over current device

47
Q

Main breaker

A

Can cut off power to all other breakers

48
Q

Transmission voltage

A

7200V

49
Q

Residential voltage

A

120/240V

Electrical (10 decks)

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