Electrical Safety-Related WP, Level II - Flashcards
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Electrical Safety-Related WP, Level II - Flashcards

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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.

3 / 5

The appointment of the NFPA 70E Committee was announced on January 7, __, and was formed to assist __ in preparing electrical safety standards.

1976 / OSHA

The 1995 edition of NFPA 70E included the concepts of __ and the establishment of an arc. The 2000 edition focused on the establishment of flash protection boundaries, personal protective equipment, and __.

limits of approach / charts

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

<p>the energized electrical work permit / supersedes</p> Signup and view all the answers

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.

<p>maintenance / supplements or modifies</p> Signup and view all the answers

Explanatory material is included in the form of informational notes, which are not enforceable as requirements.

<p>True</p> Signup and view all the answers

What condition increases the likelihood of an arc flash incident?

<p>When energized electrical conductors or circuit parts are exposed or within equipment in an unguarded or unenclosed condition.</p> Signup and view all the answers

Arc rating is defined as the value attributed to materials that describes their performance with exposure to an electrical arc discharge and expressed __. Arc-rated clothing or equipment has been tested for exposure to an electric arc, while flame-resistant clothing without an arc rating __.

<p>in cal/cm2 / has not</p> Signup and view all the answers

ATPV is defined as the incident energy (cal/cm2) that results in a __ probability of a second degree skin burn. EBT results in a __ probability of break open.

<p>50% / 50%</p> Signup and view all the answers

The arc flash boundary model indicates that a second degree burn on unprotected skin is likely to occur at an exposure of __ for __ second(s).

<p>1.2 cal/cm2 / 1</p> Signup and view all the answers

Match the following definitions with their boundaries:

<p>limited Approach Boundary = An approach limit where a shock hazard exists. Restricted Approach Boundary = An approach limit with an increased likelihood of electric shock due to electrical arc-over. Arc Flash Boundary = An approach limit from an arc source where incident energy equals 1.2 cal/cm2.</p> Signup and view all the answers

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

<p>equipment failure / arc blast injury</p> Signup and view all the answers

How is incident energy typically expressed?

<p>calories per centimeter squared (cal/cm2)</p> Signup and view all the answers

What does a qualified person demonstrate?

<p>Skills and knowledge related to the construction and operation of electrical equipment and installations.</p> Signup and view all the answers

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

<p>True</p> Signup and view all the answers

Which of the following are requirements for contract employers according to NFPA 70E?

<p>Inform contract employer about the installation hazards.</p> Signup and view all the answers

Which employee training topics are required according to 110.6(A)?

<p>Understanding specific hazards associated with electrical energy.</p> Signup and view all the answers

Which of the following are required to meet NFPA 70E emergency response training?

<p>Annual verification of training.</p> Signup and view all the answers

What documentation criteria must be met for employee training according to 110.6(A)?

<p>Duration of employment maintenance.</p> Signup and view all the answers

Which statements related to unqualified persons are true?

<p>Unqualified persons must be trained in safety practices.</p> Signup and view all the answers

What are NFPA 70E requirements related to qualified person training?

<p>Familiarity with special precautionary techniques.</p> Signup and view all the answers

The employer shall implement and document an overall electrical safety program.

<p>True</p> Signup and view all the answers

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

<p>principles / controls / procedures</p> Signup and view all the answers

An electrical safety program must include a risk assessment procedure addressing human error.

<p>True</p> Signup and view all the answers

The job safety planning requirements mandate that before starting a job involving electrical hazards, the __ must complete a job safety plan.

<p>employee in charge</p> Signup and view all the answers

Test instruments, equipment, and their accessories must be rated for circuits and equipment where they are utilized. UL 61010-1 addresses requirements for voltage measurement and test instruments intended for use on electrical systems __ and below.

<p>1,000V</p> Signup and view all the answers

Only qualified persons are permitted to perform testing on electrical equipment where there is a hazard.

<p>True</p> Signup and view all the answers

NFPA 70E Chapter 2 addresses Safety-Related __ Requirements, while Chapter 3 addresses Safety Requirements for __ Equipment.

<p>Maintenance / Special</p> Signup and view all the answers

NFPA 70E Article 205 addresses General __ Requirements.

<p>Maintenance</p> Signup and view all the answers

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

<p>False</p> Signup and view all the answers

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

<p>Layering of</p> Signup and view all the answers

NFPA 70E Article 250 addresses __ and Protective Equipment.

<p>Personal Safety</p> Signup and view all the answers

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

<p>Portable</p> Signup and view all the answers

Portable electric equipment in highly conductive work locations must be approved for those locations. In job locations, ground-fault circuit-interrupter protection must also be used.

<p>for personnel</p> Signup and view all the answers

GFCI protection devices shall be tested __.

<p>in accordance with the manufacturer's instructions</p> Signup and view all the answers

Electrical conductors and circuit parts are not in an electrically safe work condition until all requirements of Article __ have been met.

<p>120</p> Signup and view all the answers

Energized electrical conductors and circuit parts operating at voltages equal to or greater than 50 volts must be put into an electrically safe work condition before an employee performs work within the __ boundary.

<p>limited approach</p> Signup and view all the answers

Under what conditions is energized work permitted?

<p>When the task is infeasible in a deenergized state.</p> Signup and view all the answers

Study Notes

NFPA 70E Overview

  • NFPA 70E is the Standard for Electrical Safety in the Workplace, consisting of various chapters, annexes, and an introductory article.
  • The standard contains specific articles in Chapter 1, addressing fundamental electrical safety practices.

Historical Context

  • The NFPA 70E Committee was announced on January 7, 1976, to develop electrical safety standards aligned with OSHA requirements.
  • The 1995 edition introduced key concepts including limits of approach and established arc protection.

Editions and Advancements

  • The 2000 edition emphasized flash protection boundaries and personal protective equipment (PPE).
  • The 2004 edition brought forward the energized electrical work permit, which is a critical component of ensuring safety.
  • The 2021 edition supersedes all previous editions, indicating ongoing evolution in electrical safety standards.

Electrical Safety in Chapters

  • Chapter 1 addresses general electrical safety.
  • Chapter 2 focuses on safety-related maintenance requirements.
  • Chapter 3 supplements Chapter 1 with specific safety needs for special equipment.

Key Definitions

  • An arc flash hazard releases energy that can cause injury when conductors or circuit parts are exposed and not properly safeguarded.
  • Arc rating is a measure of materials' performance in the event of an electric arc, expressed in cal/cm².
  • ATPV (Arc Thermal Performance Value) and EBT (Energy Breakopen Threshold) are critical metrics for assessing fabric safety under electrical fire exposure.

Training and Competency

  • Qualified persons possess skills related to electrical equipment and can identify hazards, significantly reducing risks.
  • Unqualified persons must understand basic safety practices and are not trained in specific electrical tasks but should still be aware of potential hazards.

Emergency Response Training

  • Requirements for emergency response include CPR training, victim release training, and a structured verification process of training effectiveness annually.

Documenting Training

  • Employers must maintain proof of training completion including names, training content, instructor credentials, and duration of contexts related to electrical safety.

Safety Programs and Procedures

  • A robust electrical safety program must incorporate a risk assessment to address human error and consequences.
  • Job safety plans are mandatory prior to engagements involving electrical hazards, ensuring that employee preparedness is prioritized.

Testing Instruments and Equipment

  • All test instruments must conform to safety standards, specifically rated for the circuits in which they are used, notably at voltages below 1,000V.

Working Around Electrical Hazards

  • Only qualified individuals may work with energized electrical equipment, particularly in environments posing electrical hazards.
  • There are specific conditions under which energized work is permitted, including scenarios where de-energizing introduces additional risks or operational challenges.

Personal Protective Equipment (PPE)

  • NFPA 70E emphasizes appropriate PPE selection and layering to provide necessary safety measures under electrical hazard conditions.
  • Ground-fault circuit-interrupter (GFCI) protection is mandated in conductive environments to prevent electrical shock.

Additional NFPA 70E Annexes

  • Informative Annex H outlines requirements for protective clothing and equipment selection.
  • Annex M addresses the layering of protective clothing to enhance arc rating and overall safety during electrical work.

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Test your knowledge of the NFPA 70E Standard for Electrical Safety in the Workplace with these flashcards. Covering key chapters, articles, and definitions, this quiz is essential for understanding electrical safety standards. Perfect for professionals and students alike!

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