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4th Year Electrical > Workplace > Flashcards

Workplace Flashcards

1
Q

When does an arc fault occur?

A

When the air gap ionizes and becomes conductive

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2
Q

When do Arc flashes commonly occur

A

Well workers are working on the equipment.

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3
Q

Which is riskier: removing a door that is hinged or door that is bolted?

A

Bolted

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4
Q

What elements in the operating environment can negatively impact the electrical equipments integrity?

A

Condensation, material failure, corrosion, dust

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5
Q

What are the specific potential effects of exposure resulting from arc flash?

A 
20000 °C Burns
Shrapnel
Arc blast pressures (100's of lbs/ft²)
Noise (165dB)
Infrared and ultraviolet radiation
Toxic vapours
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6
Q

What are three factors that determine the severity of an injury due to arc flash?

A

Working distance
Amount of heat
Time it takes the circuit breaker or fuse to open

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7
Q

What are the two primary hazards involved in working on energized electrical equipment?

A

Electric shock and arc flash

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8
Q

What is the distribution of fatalities between electrical shock and arc flash incidents?

A

1% due to arc flash, 99% due to electrocution

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9
Q

Who responsible for identifying hazards in the workplace and implementing preventative and protective control measures?

A

Occupational health and safety act and regulations

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10
Q

Which legal obligations does the Alberta OH&S specify for employers and employees?

A

2) Hazard assessment elimination and controls
15) Manage and control of hazardous energy (lockout tag out)
18) Personal protective equipment

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11
Q

What should be worn underneath Arc rated clothing, if anything?

A

100% natural fibre

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12
Q

Which document specifies when an energized electrical work permit may be required?

A

CSA Z462 workplace electrical safety standard

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13
Q

Which document describes how to identify an arc flash boundary?

A

CSA Z462 workplace electrical safety standard

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14
Q

What is the risk assessment procedure as outlined by the CSA Z462 used to determine?

A 
Risk level
Arc flash boundary distance
Ark rated protective clothing required
Limited and restricted approach boundaries
Required shock related PPE
Safe work practices
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15
Q

What is the Canadian standard that addresses electrical safety requirements for workers?

A

CSA Z462 workplace electrical safety standard

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16
Q

What are the three main Clauses of the CSA Z462 workplace electrical safety standard?

A

4) safety-related work practices
5) safety-related maintenance requirements
6) safety-related requirements for special equipment

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17
Q

Who is responsible to implement and document and electrical safety program?

A

Employers

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18
Q

What are two primary conditions regarding energized electrical conductors that are addressed in the CSA Z462?

A

1) electrical equipment conductors must be D energized unless energized work can be justified
2) only qualified persons may work on energized equipment

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19
Q

At what voltage level does energize work need to be justified?

A

50 volts

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20
Q

What are the three sections of the energized electrical work permit (EEWP)?

A

1) work to be done
2) shock assessment
3) signatures

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21
Q

What is a limited approach boundary?

A

Shock hazard exists
No shock related PPE required
Can be crossed only by a qualified person or an unqualified person escorted by a qualified person

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22
Q

What is a restricted approach boundary?

A

Inadvertent-movement-risk of shock exists
Use of shock PPE required
Qualified person only

Assumption that a qualified person may make contact with energized conductors and circuit parts with approved tools and equipment

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23
Q

What is the arc flash boundary?

A

Distance at which a person may be exposed to an incident energy of 1.2 calories/cm²

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24
Q

Is a worker who is standing at the arc flash boundary required to be wearing any arc related clothing?

A

No

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25
Q

What are the two methods used for completing the arc flash risk assessment?

A

1 arc flash incident energy calculations using formulas

2 arc flash Hazard identification/PPE category table method

26
Q

What special labels would you expect to find on Arc rated clothing?

A

Arc thermal performance value (ATPV) or an energy break open threshold (EBT)

27
Q

What do you have to determine before starting an arc flash risk assessment, using method 2?

A

1 Max short circuit current

2 Assumed max fault clearing time of upstream protective device.

28
Q

What is bolted fault current?

A

Another word for the calculated short circuit current value

29
Q

When using method 2: arc flash ppe category tables, how do you determine arc flash ppe category number?

A

Using:
Available short circuit current
Arc fault current
Arc duration

To find appropriate value in CSA Z462 Table 4B or 4C

30
Q

Define working distance

A

Distance from potential arcing fault Source inside the equipment to the workers face and torso

31
Q

What is the typical working distance for high voltage switchgear

A

910mm or 36”

32
Q

What is the typical working distance for low voltage switchgear

A

610mm (24”)

33
Q

What is the typical working distance for low voltage motor control centre and panel boards?

A

455mm (18”)

34
Q

What are the two grounding classes?

A

Ungrounded and solidly grounded

35
Q

Who’s responsible to ensure that workers have adequate understanding and training on the care use and maintenance of PPE

A

Employers

36
Q

What’s the probability of protection of a worker from second-degree burns well using Arc rated clothing?

A

50%

37
Q

What’s the difference between class 1a and class 1B spectacles?

A

1 A is for impact protection with side protection

1 B’s for impact and radiation protection with side protection

38
Q

What are the three subclasses of goggles?

A

2A for impact protection
2B for impact dust and splash protection
2C are 2A or 2B with added radiation protection

39
Q

What is incident energy exposure?

A

The amount of thermal energy the workers face and chest could be exposed to at the stipulated working distances

40
Q

How is incident energy measured?

A

J/cm² or

Cal/cm²

41
Q

How does weight affect arc flash protection level of clothing?

A

Higher weights provide more thermal insulation

g/m²) or (oz/yd²

42
Q

How do layers affect arc flash protection level of clothing?

A

Multiple layers retain air space between layers providing greater thermal insulation

43
Q

What groups are responsible for making sure apprentices are trained?

A

Journeyman and supervisors
Employers
Apprentices

44
Q

What are the responsibilities of journeyman and supervisors?

A

1 acquire coaching skills
2 coach and mentor
3 supervise apprentices
4 make entries into record book as skills are acquired

45
Q

What are the responsibilities of employers?

A

1 Provide on-the-job training for the apprentices
2 ensure the apprentice is supervised.
3 ensure the apprentices direct supervising journeyman makes the appropriate entries in the apprentices record book

46
Q

What are the responsibilities of the apprentices?

A

1 Complete on the job training
2 Complete the number of apprenticeship training periods required under the contract
3 keep their record book up to date

47
Q

What is the objective of the first step of coaching (tell)?

A

For the journeyman supervisor and The Apprentice to understand the intended outcome of the session

48
Q

Describe the tell stage of a simplified coaching method

A

1 Explain a series of steps sequentially
2 Link learning to skills the learner already has
3 discuss benefits of the skill
4 talk safety concerns

49
Q

How does the tell step Aid learning?

A
  • Generate interest through interactive assessment
  • Describes benefits of the skill
  • Describes what, where, why, and how a task is accomplished
50
Q

Describe the show step

A 
Use same tools
Explain as you go
Go slow
If skill is complex consider repeating demo
Ask apprentice if they are ready to try
51
Q

What is an essential part of the “do” step?

A

Close supervision, step-by-step guidance.

52
Q

When is the first cycle of a simplified coaching method complete?

A

After The Apprentice finishes a task and the journeyman provides feedback

53
Q

What is the difference between positive and constructive feedback?

A

Positive focuses on results and describes what’s good

Constructive focuses on results and corrects a problem

54
Q

What is the plan stage of a simplified coaching lesson?

A

Defining the objective (including action word)

55
Q

What is the industry Network composed of?

A

Alberta apprenticeship and Industry training board

Local apprenticeship committees

Provincial apprenticeship committees

Occupational committees

56
Q

How much of an apprentices training takes place on the job?

A

80%

57
Q

How many designated trades and occupations are in Alberta

A

Over 50

58
Q

What are the responsibilities of the industry (employers and employees)?

A

Training and certification standards

Provide direction to the system through the industry committee Network and the alberta apprenticeship and Industry training board

59
Q

What is the responsibility of the Alberta Government in the industry training system?

A

Why legislative framework and administrative support

60
Q

What is the responsibilities of the technical Institutes?

A

Provide formal classroom training

61
Q

What are the responsibilities of individual employers?

A

Employee trained and provide apprentices and opportunity to develop their skills

62
Q

How many members are on the Alberta apprenticeship and Industry training board?

A

A chair and 12 members

4th Year Electrical (24 decks)

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