NFPA 70e Arc Flash

nfpa 70e regulations

Electrical Safety Procedures

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Here is a detailed breakdown of how the NFPA 70e Arc Flash regulations are organized:


Chapter 1 - Safety–Related Work Practices - is the central part of the NFPA 70e regulations. It covers electrical safety training requirements for Qualified and Unqualified electrical personnel and determines who is permitted to work on or near exposed energized parts. It also requires an Electrical Safety Program and specifies what that electrical safety program should include. Requirements for Lockout/Tagout are also covered, as well as the procedures for the three levels of Lockout/Tagout control: individual, simple, and complex.

NFPA 70e regulations have been developed by the National Fire Protection Association as a standard for Electrical Safety in the Workplace. It is one of the foremost consensus standards for electrical safety. It covers employee protection from the electrical hazards of shock, arc flash and arc blasts.

Chapter One is also the home of the “hot topics”: Electrical Hazard Analysis for Shock and Flash, Energized Electrical Work Permits, Approach Boundaries for Shock, Arc-Flash Boundaries, and selection of PPE (Personal Protective Equipment) for electrical safety.

Chapter 2 - Safety-Related Maintenance Requirements - is a chapter that basically requires that electrical components, wiring, and equipment be maintained in a safe condition. Most electricians will find that this chapter only documents what they already know as good electrical maintenance practice.

Chapter 3 - Safety Requirements for Special Equipment - covers batteries, lasers and power electronic equipment. This chapter addresses a few very specific types of electrical equipment that may have hazards different than the common shock and flash hazards. Many facilities now use lasers in laboratories and in workshops, and batteries are common for many uses including in UPS (Uninterruptible Power Supply) systems. Included in chapter 3 is a section on Safety-Related Work Practices for Power Electronic Equipment which specifically includes such things as electric arc welding equipment, and process equipment that have rectifiers and inverters such as: motor drives, UPS systems, and lighting controllers.

Chapter 4 - Installation Safety Requirements; is a very truncated version of the NEC®. This chapter is based on applicable sections of the NEC®, but is not intended to be used in lieu of the NEC®.

Annexes A through M include very useful information such as defining approach boundaries, how to calculate flash protection boundaries, a sample LOTO procedure, a simplified method for selecting flame-resistant clothing, and a sample Energized Electrical Work Permit.

 

Chapter 1 Safety-Related Work Practices

  • 100 Definitions
  • 105 Application of Safety-Related Work Practices
  • 110 General Requirements for Electrical Safety-Related Work Practices
  • 120 Establishing an Electrically Safe Work Condition
  • 130 Work Involving Electrical Hazards

Chapter 2 Safety-Related Maintenance Requirements

  • 200 Introduction
  • 205 General Maintenance Requirements
  • 210 Substations, Switchgear Assemblies, Switchboards, Panelboards, Motor Control Centers, and Disconnect Switches
  • 215 Premises Wiring
  • 220 Controller Equipment
  • 225 Fuses and Circuit Breakers
  • 230 Rotating Equipment
  • 235 Hazardous (Classified) Locations
  • 240 Batteries and Battery Rooms
  • 245 Portable Electric Tools and Equipment
  • 250 Personal Safety and Protective Equipment

Chapter 3 Safety Requirements for Special Equipment

  • 300 Introduction
  • 310 Safety-Related Work Practices for Electrolytic Cells
  • 320 Safety Requirements Related to Batteries and Battery Rooms
  • 330 Safety-Related Work Practices for Use of Lasers
  • 340 Safety-Related Work Practices: Power Electronic Equipment
  • 350 Safety-Related Work Requirements: Research and Development Laboratories

Annex A Referenced Publications

  • Informative Annex B Informational References
  • Informative Annex C Limits of Approach
  • Informative Annex D Incident Energy and Arc Flash Boundary Calculation Methods
  • Informative Annex E Electrical Safety Program
  • Informative Annex F Hazard Analysis, Risk Estimation, and Risk Evaluation Procedure
  • Informative Annex G Sample Lockout/Tagout Procedure
  • Informative Annex H Guidance on Selection of Protective Clothing and Other Personal Protective Equipment
  • Informative Annex I Job Briefing and Planning Checklist
  • Informative Annex J Energized Electrical Work Permit
  • Informative Annex K General Categories of Electrical Hazards
  • Informative Annex L Typical Application of Safeguards in the Cell Line Working Zone
  • Informative Annex M Layering of Protective Clothing and Total System Arc Rating
  • Informative Annex N Example Industrial Procedures and Policies for Working Near Overhead Electrical Lines and Equipment
  • Informative Annex O Safety-Related Design Requirements
  • Informative Annex P Aligning Implementation of This Standard with Occupational Health and Safety Management Standards
  • Index

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