Electrical Safety-Related WP, Level II - 2021

NFPA 70E, Standard for Electrical Safety in the Workplace, consists of ? chapters; 18 informative annexes; the Foreword to NFPA 70E; and Article 90, Introduction. Chapter 1 is divided into ? articles.

A. 3/5

The appointment of the NFPA 70E Committee was announced on January 7, ? , and was formed to assist ? in preparing electrical safety standards that would serve its requirements.

B. 1976/OSHA

Test instruments, equipment, and their accessories are required to be rated for circuits and equipment where they are utilized. UL 61010-1, 1, Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use - Part 1: General Requirements, addresses rating and design requirements for voltage measurement and test instruments intended for use on electrical systems ? and below.

C. 1,000V

Electrical conductors and circuit parts shall not be considered to be in an electrically safe work condition until all of the requirements of Article ? have been met.

C. 120

NFPA 70E Informative Annex H is titled Requirements for the Selection of Protective Clothing and Other Personal Protective Equipment.

False

An electrical safety program in compliance with NFPA 70E must include a risk assessment procedure that addresses the potential for human error and its negative consequences on people, processes, the work environment, and equipment.

True

Explanatory material is included in the form of informational notes, which are not enforceable as requirements. Brackets containing section references to another NFPA document are for informational purposes only and are provided as a guide to indicate the source of the extracted text.

True

The employer shall implement and document an overall electrical safety program that directs activity appropriate to the risk associated with electrical hazards.

True

An unqualified person is defined as a person who is not a qualified person.

True.

The Informational Note to the definition of arc flash boundary (Boundary, Arc Flash) states that, according to the Stoll skin burn injury model, the onset of a second degree burn on unprotected skin is likely to occur at an exposure of ? for ? second(s).

a. 1.2 cal/cm2 / 1

Determine which of the following are among the NFPA 70E requirements related to qualified person training, either generally or when such persons are permitted to work within the limited approach boundary. I. The employee must be familiar with the proper use of the special precautionary techniques, applicable electrical policies and procedures, PPE, insulating and shielding materials, and insulated tools and test equipment. II. The employee must be trained in the decision-making process necessary to be able to select the appropriate risk control methods from the hierarchy of controls identified in 110.5(H)(3), including PPE. III. The employee must be trained in the skills and techniques necessary to determine the nominal voltage of exposed energized electrical conductors and circuit parts. IV. The employee must be trained to select an appropriate test instrument and demonstrate how to use the correct device to verify the absence of voltage. V. The employer must determine that each employee is complying with the safety-related work practices required by NFPA 70E through regular supervision or inspections conducted on at least an annual basis.

a. I., II., III., 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 limitation. IV. Where the employer can demonstrate that the task would take longer to perform in a deenergized state.

a. I., II., and III.

The employer must document that each employee has received the training required by 110.6(A). This documentation of training must satisfy which of the following criteria? I. It must be made when the employee demonstrates proficiency in the work practices involved. II. It must be maintained for the duration of the employee's employment. III. It must contain the content of the training, each employee's name, and dates of training. IV. It must contain the identity of the person conducting the training and a copy of his or her training credentials.

a. I., II., and III.

Identify which of the following statement(s) is/are true as they relate to unqualified persons. I. An unqualified person is defined as a person who is not a qualified person. II. Unqualified persons are not required to be trained. III. Unqualified persons must be familiar with any electrical safety-related practices necessary for their safety. IV. Unqualified persons must be trained in any electrical safety-related practices necessary for their safety.

a. I., III., and IV.

A. An approach limit at a distance from an exposed energized electrical conductor or circuit part within which a shock hazard exists. B. An approach limit at a distance from an exposed energized electrical conductor or circuit part within which there is an increased likelihood of electric shock, due to electrical arc-over combined with inadvertent movement. C. When an arc flash hazard exists, an approach limit from an arc source at which incident energy equals 1.2 cal/cm2 (5 J/cm2)

a. limited Approach Boundary b. Restricted Approach Boundary c. Arc Flash Boundary

Incident energy is defined as the amount of thermal energy impressed on a surface, a certain distance from the source, generated during an electrical arc event. Incident energy is typically expressed in ? .

b. calories per centimeter squared (cal/cm2)

The job safety planning and job briefing requirements mandate that before starting each job that involves exposure to electrical hazards the ? must complete a job safety plan and conduct a job briefing with the employees involved.

b. employee in charge

An electrical hazard is defined as a dangerous condition such that contact or ? can result in electric shock, arc flash burn, thermal burn, or ? .

b. equipment failure / arc blast injury

Portable electric equipment used in highly conductive work locations shall be approved for those locations. In job locations where employees are likely to contact or be drenched with water or conductive liquids, ? shall also be used.

b. ground-fault circuit-interrupter protection for personnel

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 where the employee is within the ? boundary.

b. limited approach

NFPA 70E Chapter 1 applies generally to electrical safety in the workplace. Chapter 2 addresses safety-related ? requirements. Chapter 3 ? Chapter 1 with safety requirements for special equipment.

b. maintenance / supplements or modifies

ATPV is defined in ASTM F1959/F1959M as the incident energy (cal/cm2) on a material or a multilayer system of materials that results in a ? probability that sufficient heat transfer through the tested specimen is predicted to cause the onset of a second degree skin burn injury based on the Stoll curve. EBT is defined in ASTM F1959/F1959M as the incident energy (cal/cm2) on a material or a material system that results in a ? probability of break open.

c. 50% / 50%

The electrical safety training requirements in 110.6(A) state that employees are required to be trained in a number of topics. Which of the following are among those employee training topics? I. In safety-related work practices and procedural requirements, as necessary, to provide protection from the electrical hazards associated with their respective job or task assignments II. To develop and implement a safety program and related training appropriate for the anticipated hazards III. To identify and understand the relationship between electrical hazards and possible injury IV. To understand the specific hazards associated with electrical energy

c. I., III., and IV.

Determine which of the following are required to meet the NFPA 70E requirements related to emergency response training. I. A second person shall be required for all energized work above 50 volts and shall be trained to avoid the anticipated hazards and in selection of the equipment necessary to safely perform the assigned task. II. Employees exposed to shock hazards and those responsible for the safe release of victims from contact with exposed energized electrical conductors or circuit parts shall be trained in methods of safe release. III. Employees responsible for responding to medical emergencies shall be trained in first aid and emergency procedures. IV. Employers shall verify at least annually that employee emergency response training is current. V. The employer shall document that emergency response training has occurred.

c. II., III., IV., and V.

NFPA 70E Informative Annex M is titled ? Protective Clothing and Total System Arc Rating.

c. Layering of

NFPA 70E Article 205 addresses General ? Requirements.

c. Maintenance

NFPA 70E Chapter 2 addresses Safety-Related ? Requirements, and Chapter 3 addresses Safety Requirements for ? Equipment.

c. Maintenance / Special

GFCI protection devices shall be tested ? .

c. in accordance with the manufacturer's instructions

Arc rating is defined in Article 100, in part, as the value attributed to materials that describes their performance with exposure to an electrical arc discharge and is expressed ? . Informational Note No. 1 states, in part, that arc-rated clothing or equipment has been tested for exposure to an electric arc and that flame-resistant (FR) clothing without an arc rating ? been tested for exposure to an electric arc.

c. in cal/cm2 / has not

The 1995 edition of NFPA 70E included the concepts of ? and the establishment of an arc. The 2000 edition continued to focus on establishment of flash protection boundaries, the use of personal protective equipment, and ? to assist the user in applying appropriate protective clothing and personal protective equipment for common tasks.

c. limits of approach / charts

The electrical safety program must identify the ? upon which it is based, the ? by which it is measured and monitored, and the ? to be utilized before work is started by employees exposed to an electrical hazard.

c. principles / controls / procedures

The requirements that address host and contract employer's responsibilities require a number of things. Which of the following are among those requirements? I. The contract employer must ensure that each employee follows the work practices required by NFPA 70E in addition to any safety-related work rules of the host employer. II. The contract employer must provide a list of personnel that are qualified to perform CPR to the host employer. III. The contract employer must provide a list of personnel that are qualified to perform energized work to the host employer. IV. The host employer must inform the contract employer with the information about the employer's installation that the contract employer needs to make the assessments required by Chapter 1 of NFPA 70E. V. There must be a documented meeting between the host employer and the contract employer where the host employer has knowledge of hazards covered by NFPA 70E that are related to the contract employer's work.

d. I., IV., and V.

NFPA 70E Article 250 addresses ? and Protective Equipment.

d. Personal Safety

NFPA 70E Article 245 addresses ? Electric Tools and Equipment.

d. Portable

An arc flash hazard is defined in Article 100 as a source of possible injury or damage to health associated with the release of energy caused by an electric arc. Informational Note No. 1 indicates that the likelihood of occurrence of an arc flash incident increases when energized electrical conductors or circuit parts are exposed or when they are within equipment in a(n) ? condition, provided a person is interacting with the equipment in such a manner that could cause an electric arc. An arc flash incident is not likely to occur under normal operating conditions when enclosed energized equipment has been properly installed and ? .

d. guarded or enclosed / maintained

A qualified person is defined as one who has demonstrated skills and knowledge related to the construction and ? of electrical equipment and installations and has received safety training to ? the hazards and reduce the associated risk.

d. operation / identify

The 2004 edition of NFPA 70E introduced the requirements of ? . The 2021 edition ? all previous editions.

d. the energized electrical work permit / supersedes

Only qualified persons are permitted to perform tasks such as testing, troubleshooting, and voltage measuring on electrical equipment ? .

d. where an electrical hazard exists