Lesson 2: Justification, Assessment, and Implementation of Energized Work
The limited approach boundary distance for a task involving a fixed circuit part operating at 480 volts, nominal, is ___. a. 1'0" b. 3'6" c. 10' d. None of the above
3'6"
The distance associated with each shock protection approach boundary to exposed energized electrical conductors or circuit parts is determined by the nominal phase-to-phase system voltage range for ___ systems and the nominal potential difference for ___ voltage systems. a. AC / DC b. DC / AC c. denergized / energized d. energized / deenergized
AC / DC
Article 130 begins with the general requirement stating, in part, that all requirements of Article 130 apply if a(n) ___ analysis is completed or if Table 130.7(C)(15)(a), Table 130.7(C)(15)(b), and Table 130.7(C)(15)(c) are used in lieu of an incident energy analysis. a. arc flash energy b. electrical hazard c. incident energy d. shock hazard
incident energy
One of the conditions where energized electrical conductors and circuit parts operating at voltages equal to or greater than 50 volts shall be put into an electrically safe work condition before an employee performs work is where the employee is within the ___ boundary. a. arc blast approach b. limited approach c. prohibited approach d. shock hazard approach
limited approach
An energized electrical work permit is generally required and documented when working within the limited approach boundary or the arc flash boundary of exposed energized electrical conductors or circuit parts that are not placed in an electrically safe work condition. True False
False
Article 130, Work Involving Electrical Hazards, by definition, covers work involving four hazards caused by either proximity or equipment failure. True False
False
Determination of an arc flash PPE category for a task performed on DC systems is determined from Table 130.7(C)(15)(a). True False
False
Table 130.7(C)(15)(a) is used to determine whether arc flash PPE is required. True False
False
The arc flash PPE category can be determined through an incident energy analysis. True False
False
A qualified person is never permitted to cross the restricted approach boundary. True False
False
When an employee works in a confined or enclosed space that contains exposed energized electrical conductors or circuit parts operating at voltages equal to or greater than 50 volts or where an electrical hazard exists, protective shields, protective barriers, or insulating materials must be ___ as necessary to avoid inadvertent contact with these parts and the effects of the electrical hazards. a. determined and put in place b. provided by the employer c. provided by the employer and used by the employee d. used by the employee
provided by the employer and used by the employee
Only ___ persons shall be permitted to work on electrical conductors or circuit parts that have not been put into an electrically safe work condition. a. authorized b. certified c. documented d. qualified
qualified
The informational note to 130.7(A) informs that, even when protection is selected in accordance with the PPE requirements of 130.7, some situations could result in burns to the skin, although burn injury should be ___. a. eliminated as far as practicable b. negligible c. reduced and survivable d. reduced to a reasonable level
reduced and survivable
The arc flash boundary shall be the distance at which the incident energy equals ___. a. 1.2 cal/cm2 b. 2 cal/cm2 c. 5.3 cal/cm2 d. 7.5 cal/cm2
1.2 cal/cm2
The limited approach boundary distance for an overhead line conductor operating at 480 volts, nominal, is ___. a. 1'0" b. 3'6" c. 10' d. None of the above
10'
The requirements of ___ shall apply when the arc flash PPE category method is used for the selection of arc flash PPE. a. 90.2(B)(4) b. 105.2 c. 120.5 d. 130.7(C)(15)
130.7(C)(15)
Table ___ is used to determine protective clothing and PPE to be used when working within the arc flash boundary based on the determined arc flash PPE category. Arc-rated clothing with a minimum arc rating of ___ is required for arc flash PPE Category 2. a. 130.7(C)(15)(a) / 8 cal/cm2 b. 130.7(C)(15)(b) / 4 cal/cm2 c. 130.7(C)(15)(c) / 4 cal/cm2 d. 130.7(C)(15)(c) / 8 cal/cm2
130.7(C)(15)(c) / 8 cal/cm2
___ parts of the body inside the arc flash boundary shall be protected. When arc-rated clothing is worn to protect an employee, it shall cover all ___ clothing. a. All / ignitible b. Exposed / cotton c. Specifically identified / polyester blend d. Vulnerable / nylon
All / ignitible
The following items would meet the protective clothing and personal protective equipment (PPE) requirements for arc flash PPE Category 2, where there is not a need for an arc-rated jacket, parka, rainwear, or hard hat liner: Arc-rated long-sleeve shirt and pants with a minimum arc rating of 8 cal/cm2 Arc-rated faceshield with a minimum arc rating of 8 cal/cm2 Hard hat Safety glasses Hearing protection (ear canal inserts) Heavy duty leather gloves Leather footwear True False
False
In addition to meeting other requirements, such as those in 130.7(C)(7) and 130.7(C)(14), which of the following are accurate statements related to the requirements for hand protection used as arc flash protective equipment? I. Heavy-duty leather gloves or arc-rated gloves must be worn where required for arc flash protection. II. Heavy-duty leather gloves and arc-rated gloves worn without insulating rubber gloves provide both shock and arc flash protection. III. Where insulating rubber gloves are used for shock protection, arc-rated gloves must be worn over the rubber gloves. IV. Where insulating rubber gloves are used for shock protection, leather protectors must be worn over the rubber gloves. a. I. and II. b. I. and IV. c. II. and III. d. II. and IV.
I. and IV.
Which of the following statements are true for tasks performed on energized equipment in panelboards or other equipment rated greater than 240 volts and up to 600 volts within the parameters of Table 130.7(C)(15)(a) when arc flash PPE is required? I. Parameters include a maximum of 25 kA available fault current and a maximum of a two-cycle fault clearing time. II. The incident energy, based on the maximum available fault current and the maximum fault clearing time provided as the parameters for this equipment, is 8 cal/cm2. III. The potential arc flash boundary, based on the maximum available fault current and the maximum fault clearing time provided for this equipment, is 48 inches. IV. Voltage testing would constitute an arc flash PPE category 2, when arc flash PPE is required. a. I., II., and III. b. I., II., III., and IV. c. I., II., and III. d. I. and IV.
I. and IV.
Electrical equipment such as switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers that are in other than dwelling units, and that are likely to require examination, adjustment, servicing, or maintenance while energized, must generally be field marked with a label. Which of the following information must be contained on the label where a label is required? I. The arc flash boundary II. The available incident energy and the corresponding working distance III. The minimum arc rating of clothing IV. The arc flash PPE category for the equipment V. The nominal system voltage VI. The site-specific level of PPE a. I., II., and IV. b. I. and V. c. II., III., IV., and VI. d. III. and IV.
I. and V.
In accordance with the requirements in 130.7(C)(15)(a), Table 130.7(C)(15)(a) is to be used to determine which of the following for AC equipment? I. The arc flash PPE category II. The incident energy III. The need for the use of insulated and insulating hand tools for a task IV. The need for the use of rubber insulating gloves a. I. only b. I., II., III., and IV. c. II., III., and IV. d. III. and IV.
I. only
Section 130.8 deals with the requirements for work within the limited approach boundary or arc flash boundary of overhead lines. Which of the following are categories of requirements related to this work? I. Approach Distances for Unqualified Persons II. De-energizing or Guarding III. Determination of Insulation Rating IV. Employer and Employee Responsibility V. Uninsulated and Energized VI. Vehicular and Mechanical Equipment VII. Working on or Near VIII. Work Practices a. I., II., III., and IV. b. I., II., III., IV., V., and VI. c. I., II., III., IV., V., VI., VII., and VIII. d. I., III., IV., VII., and VIII.
I., II., III., IV., V., and VI.
Several requirements cover the care and maintenance of arc-rated clothing and arc flash suits. Identify which of the following statements are true as they relate to these requirements. I. Apparel must be inspected before each use. II. ASTM F 1506 is an example of a standard that contains information on PPE, but it is not a standard that is required to be followed. III. Garments cannot be used where contaminated or damaged to the extent that their protective qualities are impaired. IV. Guidance is provided in ASTM F 1506 when trim, name tags, or logos are affixed to arc-rated garments. V. Manufacturer's instructions for care, maintenance, and cleaning must be followed. VI. The same arc-rated materials used to manufacture the clothing must be used for repair. a. I., II., III., IV., V., and VI. b. I. and IV. c. II., III., IV., V., and VI. d. IV., V., and VI.
I., II., III., IV., V., and VI.
Which of the following are identified as categories of requirements related to precautions for personnel activities? I. Alertness II. Anticipating Failure III. Blind Reaching IV. Conductive Articles Being Worn V. Duties of Electrically Qualified Personnel VI. Estimation of Heat Energy VII. Illumination VIII. Reclosing Circuits After Protective Device Operation IX. Routine Opening and Closing of Circuits a. I., II., III., IV., V., VI., VII., VIII., and IX. b. I., II., III., IV., VII., VIII., and IX. c. I., V., VI., VII., VIII., and IX. d. I., VI., VII., VIII., and IX.
I., II., III., IV., VII., VIII., and IX.
Several factors must be considered in the selection of protective clothing. Coverage is one of these factors, and includes which of the following? I. Jackets must be closed at the neck. II. Shirts must be closed at the neck. III. Shirt sleeves must be fastened at the wrists. IV. Shirts must be tucked into pants. a. I., II., III., and IV. b. II., III., and IV. c. II. and IV. d. III. and IV.
I., II., III., and IV.
Which of the following are considerations related to the incident energy analysis method? I. Arc-rated clothing and other PPE shall be used by the employee based on the incident energy exposure associated with the specific task. II. The incident energy analysis shall take into consideration the characteristics of the overcurrent protective device and its fault clearing time, including its condition of maintenance. III. The incident energy analysis shall be updated when changes occur in the electrical distribution system that could affect the results of the analysis. IV. The incident energy exposure level must be based on the working distance of the employee's face and chest areas from a prospective arc source for the specific task to be performed. a. I. and II. b. I., II., III., and IV. c. II. and III. d. III. and IV.
I., II., III., and IV.
Which of the following are required to be included on an energized electrical work permit? I. Arc flash boundary II. Available incident energy at the working distance or arc flash PPE category III. Name(s) of person(s) performing the arc flash risk assessment IV. Personal and other protective equipment required by NFPA 70E to protect against the arc flash hazard V. Results of the shock risk assessment a. I., II. III., and IV. b. I., II., III., IV., and V. c. I., II., IV., and V. d. I., III., and V.
I., II., IV., and V.
Energized work is generally prohibited. Such work is permitted under which of the following conditions? I. For energized electrical conductors and circuit parts that operate at less than 50 volts, where the capacity of the source and any overcurrent protection between the energy source and the worker are considered and it is determined that there will be no increased exposure to electrical burns or to explosion due to electric arcs. II. Where the employer can demonstrate that deenergizing introduces additional hazards or increased risk. III. Where the employer can demonstrate that the task to be performed is infeasible in a deenergized state due to equipment design or operational limitations. IV. Where the employer can demonstrate that the task would take longer to perform in a deenergized state. a. I., II., and III. b. I., II., III., and IV. c. II. and III. d. III. and IV.
I., II., and III.
Alerting techniques are located in 130.7 and are therefore a form of protective equipment. Which of the following is/are categories of requirements of alerting techniques? I. Attendants II. Barricades III. Look-Alike Equipment IV. Safety Signs and Tags a. I., II., III., and IV. b. I., II., and IV. c. III. and IV. d. IV. only
I., II., and IV.
Which of the following are required by the 130.7(B) provisions addressing the care of protective equipment? I. The protective equipment must be maintained in a safe, clean, and reliable condition and in accordance with manufacturer's instructions. II. The protective equipment must be stored in a manner to prevent damage from physically damaging conditions and from moisture, dust, or other deteriorating agents. III. The protective equipment must be visually inspected after each use. IV. The protective equipment must be visually inspected before each use. a. I., II., III, and IV. b. I., II., and IV. c. II. and III d. III. and IV.
I., II., and IV.
A shock risk assessment is required to be performed for which of the following reasons? I. To determine if additional protective measures are required, including the use of PPE II. To estimate the incident energy III. To estimate the likelihood of occurrence of injury or damage to health and the potential severity of injury or damage to health IV. To identify shock hazards a. I., II., III., and IV. b. I., III., and IV. c. II. and IV. d. III. and IV.
I., III., and IV.
NFPA 70E requires protective equipment as necessary. It also requires that much of this protective equipment conform to applicable state, federal, or local codes and standards. Identify which of the following statements are true as they relate to standards that protective equipment must meet. I. Mandatory other protective equipment standards are identified in Table 130.7(G) Informational Note: Standards on Other Protective Equipment. II. Other protective equipment standards are identified in Table 130.7(G) Informational Note: Standards on Other Protective Equipment. III. Personal protective equipment standards are identified in Table 130.7(C)(14) Informational Note: Standards for Personal Protective Equipment. IV. Personal protective equipment must conform to the standards specified in Table 130.7(C)(14) Informational Note: Standards for Personal Protective Equipment. a. I. and III. b. I. and IV. c. II. and III. d. II. and IV.
II. and III.
In addition to meeting other requirements, such as those in 130.7(C)(3) and 130.7(C)(14), head protection must also meet which of the following arc flash protective head protection requirements? I. An arc-rated balaclava with an arc-rated faceshield shall not be permitted when the back of the head is within the arc flash boundary. II. An arc-rated balaclava with an arc-rated faceshield is an option when the back of the head is within the arc flash boundary and the anticipated incident energy exposure is 12 cal/cm2 or less.III. An arc-rated hood shall be permitted to be used instead of an arc-rated faceshield and balaclava combination unless the anticipated incident energy exposure exceeds 8 cal/cm2.IV. An arc-rated hood shall be permitted to be used instead of an arc-rated faceshield and balaclava combination unless the anticipated incident energy exposure exceeds 12 cal/cm2. a. I. and III. b. I. and IV. c. II. and III. d. II. and IV.
II. and IV.
Which of the following are required to be included on an energized electrical work permit? I. Date and duration of the permit II. Energized work approval signature(s) III. Evidence of completion of a job briefing, including a discussion of any job-specific hazards IV. Means employed to restrict the access of unqualified persons from the work area V. Name(s) of person(s) qualified to perform the task energized a. I., II., III., and IV. b. I., II., III., IV., and V. c. II., III., and IV. d. IV. and V.
II., III., and IV.
Which of the following is/are the recognized methods for the selection of protective clothing and other PPE where work will be performed within the arc flash boundary? I. Arc flash hazard analysis method II. Arc flash incident energy III. Arc flash PPE category IV. Incident energy analysis a. I. only b. I. and II. c. II. and III. d. III. and IV.
III. and IV.
Which of the following are required to be included on an energized electrical work permit? I. Date of the most recent calibration of the upstream overcurrent protective device protecting the circuit II. Documentation of the arc flash risk assessment method used III. Justification for why the work must be performed in an energized condition IV. Personal and other protective equipment required by NFPA 70E to safely perform the assigned task and to protect against the shock hazard V. Results of the arc flash risk assessment a. I., II., III., IV., and V. b. I., III., and V. c. II., III., and IV. d. III., IV., and V.
III., IV., and V.
___ is a component of an arc flash risk assessment used to predict the incident energy of an arc flash for a specified set of conditions. a. Arc blast energy analysis b. Electrical hazard analysis c. Incident energy analysis d. Shock hazard analysis
Incident energy analysis
Personal protective equipment (PPE), such as arc flash protective equipment, shock protection, and head, face, eye, and hearing protection, is covered in 130.7(C). ___ protective equipment, such as insulated tools, protective shields, and rubber insulating equipment used for protection from unintentional contact, is covered in ___. a. Additional / 120.2 b. Identified / 130.7(E)(4) c. Other / 130.7(D) d. Requisite / 110.1(H)(3)
Other / 130.7(D)
An unqualified person is never permitted to cross the restricted approach boundary. True False
True
Appropriate safety-related work practices shall be determined before any person is exposed to the electrical hazards involved by using both shock risk assessment and arc flash risk assessment. True False
True
Garments worn as outer layers over arc-rated clothing, such as jackets or rainwear, shall also be made from arc-rated material. True False
True
The shock protection approach boundary distances are the distances from exposed energized electrical conductors or circuit parts to the employee. True False
True
The term exposed movable conductor is normally applied to overhead line conductors supported by poles. True False
True
Working within the limited approach boundary at voltages equal to or greater than 50 volts is generally prohibited while alertness is recognizably impaired. True False
True
