NFPA 70E. Electrical Safety in the Workplace. KTR Associates. Joseph Deane, PE. Engineering Solutions
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1 NFPA 70E Electrical Safety in the Workplace KTR Associates Engineering Solutions Joseph Deane, PE
2 Goal for Today Better understanding of NFPA 70E Raise the awareness of Electrical Hazards Why the sudden focus What one must do to become 70E compliant
3 Topics To Be Discussed Define Electrical Hazards Safety Numbers Industry Standards/Government Regulations What is an Arc Flash? Sample Arc Flash Study PPE Requirements
4 Why do we need Electrical Safety? Provide a safe work environment Reduce injuries Comply with regulations Reduce liability Reduce operating costs
5 What are the Electric Hazards? Shock Arc Flash Arc Blast
6 Terms and Definitions Electric Shock (Contact): Occurs when electricity (electric current) passes through the human body. Electric current passing through the chest area may result in death.
7 Terms and Definitions Arc Flash: Short circuit through air; defined as the rapid release of energy due to an arcing fault between two phase conductors (such as bus bar) or neutral or ground. Arc Blast: Heating of the air and vaporization of metal creates a pressure wave than can damage hearing and other injuries. Flying metal parts are a hazard.
8 Terms and Definitions Incident Energy: Energy dissipated during an arc fault, or arc flash event. Measured in cal/cm 2. Arc Thermal Performance Value (ATPV): Minimum energy causing the predicted onset of second degree burns. A second degree burn is 1.2 cal/cm 2.
9 Why the Recent Focus? NFPA 70E standard now recognizes Arc Flash as a serious consequence and requires a Flash Hazard analysis be performed on facilities. OSHA has updated its Electrical Safety Procedures for the first time in 25 years. Effective date of OSHA s updated regulations is August 13, 2007
10 Electrical Statistics At least one person a day is electrocuted in the workplace everyday Over half of the deaths are from working live electrical circuits less than 600 volts. Average of 4000 non-disabling and 3600 disabling electrical injuries occur in the US.
11 Electrocutions by Year (Construction Safety Council) # Electrocutions
12 Electrical Statistics Five to 10 arc flash explosions occur in electrical equipment every day in the US. Fourth leading cause of occupational fatalities. Over 2000 workers are admitted to burn centers each year.
13 Burn Costs Average burn case costs $12 to $20 Million Average hospital burn unit costs $400K per month Average hospital burn unit stay 3 months
14 Electrical Statistics General Industry One fatality per 300 recordable injuries. Electrical Industry One fatality per 10 recordable injuries.
15 Electrician Survey 97% had experienced an electrical shock. 26% had witnessed an injury. 58% were exposed to the possibility of an injury every day.
16 Facts on Electrical Incidents 80% of electrically related accidents and fatalities among Qualified Workers are caused by Arc Flash. 80% of electrically related accidents and fatalities among Unqualified Workers are caused by Electrocutions. Age 34 is the median age for someone killed working around electricity.
17 OSHA & NFPA 70E OSHA was created in It incorporated the National Electric Code (NFPA 70 standard 1971) into its electrical standard. NFPA 70E Standard was created at the request of OSHA in 1979 to recognize the difference between design and workplace safety. NFPA 70 (NEC) applies to installations (design). NFPA 70E addresses workplace safety.
18 OSHA Regulations OSHA bases its electrical safety mandates on: CFR 1910 Subpart S (General Industry) CFR 1926 Subpart K (Construction) OSHA recognizes NEC and NFPA 70E as an industry standards.
19 OSHA Regulations OSHA requires companies to follow its regulations and will cite companies for non-compliance under the General Duty Clause: which states, each employer shall furnish to each of its employees a place of employment that is free from recognized hazards that are likely to cause death or serious physical harm.
20 OSHA Regulations OSHA is also citing companies for the following: 29 CFR (a)(1)(i): requires the use of protective equipment when working where a potential electrical hazard exists. 29 CFR (d)(1): requires an employer assessment of all workplace hazards and the use of personal protective equipment.
21 Who is the NFPA? The National Fire Protection Association (NFPA) develops, publishes, and disseminates more than 300 consensus codes and standards intended to minimize the possibility and effects of fire and other risks. Virtually every building, process, service, design, and installation in society is affected by the NFPA documentation (Ex. the National Electric Code NFPA 70).
22 National Electric Code (NFPA 70) Utilized for design and installation of electric facilities Wiring and Protection Wiring Methods and Material Equipment for General Use Special Equipment and Conditions
23 Intent of NFPA 70E Objective is to minimize exposure to electrical hazards for personnel working around electricity. This includes: Electricians Mechanics HVAC technicians Painters Plumbers Carpenters Production Workers
24 Intent of NFPA 70E Define Safe Work Practices to avoid injury. Define the requirements for an Electrical Safety Program. Define the requirements for Training Define the requirements for PPE Applies to all types of employers and facilities, including employees, contractors, and construction workplaces.
25 NFPA 70E Electrical Safety Standard in the Workplace Chapter 1 Safety Related Work Practices Chapter 2 Safety Related Maintenance Requirements Chapter 3 Safety Requirements for Special Equipment Chapter 4 NEC Related Installation Material
26 NFPA 70E covers Public and private buildings Carnivals Industrial Substations Any installation of electrical equipment to the supply of electricity
27 NFPA 70E does not cover Utilities Ships Mines Railways Communication equipment under control of communication utilities
28 NFPA 70E Chapter 1 Article 110 Provides General Requirements Responsibility Electrical Hazard Analysis Training Requirements Electrical Safety Program Article 120 Emphasizes Working Deenergized & Describes the Work Practices Article 130 Provides Requirements for Working On or Near Electrical Components
29 Chapter 1 Responsibility Employers are responsible for providing work practices and procedures. Employees are responsible for implementing them.
30 Chapter 1 Multiemployer Relationship Recognizes that more than one employer may be responsible for hazardous conditions on a worksite. Outside contractors are contractually obligated to the onsite employer. Both employers must share their Electrical Safety Programs with each other.
31 Chapter 1 Multiemployer Relationship Onsite employers and outside contractors shall inform each other: Of existing hazards PPE requirements Safe work practice procedures Emergency procedures Coordination should include a meeting and documentation
32 Chapter 1 Electrical Safety Program What needs to be in it? Scope Philosophy Principles Responsibilities Safety Procedures
33 Chapter 1 Electrical Safety Program PPE Requirements Controls Training Requirements Auditing Other?
34 Chapter 1 Training Requirements Trained to understand the specific risks associated with electric energy. Trained on safe work practices and procedures. Trained on emergency procedures. Training may be both classroom and on the job.
35 Training Session Misc. Real World Examples Refeeding Panels (What needs to be checked?) Transformer Connections (Why they are important) Types of Grounding Systems Explain how voltage is a difference in potential
36 Chapter 1 Electrical Hazard Analysis Requires an electrical hazard analysis, which is a study of a worker s potential exposure to: Shock Arc Flash/Blast It determines the appropriate levels of Personal Protective Equipment (PPE) and work practices.
37 Electric Shock The original purpose of NFPA 70E Determine the voltage to which personnel will be exposed. Boundary Requirements PPE Requirements
38 Exposure to Shock Requires exposure to a difference of potential The National Electric Code reduces this risk under normal conditions. NFPA 70E reduces the risk under abnormal conditions
39 NEC Protects - Normal Conditions
40 70E Protects - Abnormal Condition
41 Effects of Electric Current on the Human Body Amps < 1 ma Barely perceptible 5-10 ma Tingling sensation (annoying) ma Let Go threshold (discomfort) ma Painful, cannot Let Go ma Ventricular fibrillation Amps > 100 ma Cardiac arrest
42 Effects of Electric Current on the Human Body Electric current greater than the Let Go threshold ( current > 20 ma) contracts the human body s muscles. Individuals unable to Let Go an energized line face life threatening damage to their bodies. If this current level continues for an extended period of time, respiratory paralysis is possible. Ventricular fibrillation (uneven pumping of the heart) causes death to lack of oxygen to the brain.
43 Arc Flash/Blast Electrical Arc between Conductors Intense Light Molten Metal Pressure Wave Sound Wave Shrapnel Hot Air Rapid Expansion
44 Dangers of Arc Flash Arcs in enclosures, such as MCCs and switchgear, magnify a blast outward as energy is transmitted to the open side of the enclosure. Fatal Burns (Molten metal at high speed pressure). Falls from ladders (Blast pressure waves). Hearing loss from sound blast.
45 Causes of Arc Flash Contamination Dust, Dirt or Vapor Corrosion Moisture Ingress Dropping tools or equipment Insulation Breakdown/Aging Narrow Gaps
46 NFPA 70E Arc Flash Hazard Analysis A flash hazard analysis shall be done for two purposes: Determine the arc flash protection boundary. Determine the proper PPE (rating of flame retardant clothing). The Flash Protection Boundary is the approach limit from which a person could receive a second degree burn if an arc flash occurs.
47 Sample Arc Flash Study How do you do an Arc Flash Study? Results of an Arc Flash Study
48 IEEE 1584 Standard Guide for Performing Arc Flash Hazard Calculations Performing the Arc Flash Study
49 IEEE 1584 Standard Guide for Performing Arc Flash Hazard Calculations Nine Step Process Collect system and installation data Determine system mode of operation Determine bolted fault currents Determine arc fault currents Find protective device characteristics and arc duration
50 IEEE 1584 Standard Guide for Performing Arc Flash Hazard Calculations Nine Step Process (continued) Document system voltages and equipment class Select working distances Calculate the incident energy Calculate the Flash Protection Boundary From this info, select the proper PPE
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52 KTR Associates
53 Purpose of Safety Related Work Practices (Article 120) A set of rules that ensure an Electrically Safe Work Condition. De-energizing is safest work condition. Protect employees from: Shock Arc Flash burns Arc Blast injuries
54 Steps to Create an Electrically Safe Work Condition (De-energized state) Check drawings and identify all possible sources Interrupt load current and open disconnects Visually verify opening of contacts where possible Apply lockout/tagout devices according to policy Test voltage and verify operation of tester Apply grounds where necessary
55 Working on or near energized circuits (Article 130) Why work on energized circuits?
56 Examples of working on energized equipment Startup or troubleshooting Life Support systems Emergency systems Ventilation systems for hazardous locations
57 Examples of working on energized equipment Infeasibility due to equipment design or operational limitations Circuits that are part of integral process.
58 NFPA 70E Requirements for Working on or Near Live Parts Complete Energized Electrical Work Permit Perform Hazard/Risk Analysis Select PPE Ensure task specific training Conduct a job briefing
59 Energized Electrical Work Permit Requires written authorization Requires the worker to: Identify and understand the hazards Be a qualified person Wear proper PPE Restrict access to unqualified persons Complete a job briefing
60 No Permit Required When Testing (voltage, current, phasing) Troubleshooting Circuit Identification
61 Approach Distances to Exposed Live Parts
62 PPE Requirements Protect against shock and burns Designed to protect specific areas of the body: Head, face, neck Ear protection Eye protection Body protection Hand and arm protection Foot and leg protection
63 Flash Protection Boundary & PPE When working within the flash protection boundary, PPE must be worn. PPE is determined by the level of incident energy exposure.
64 Personal Protective Equipment (PPE) Flash Hazard Risk Category Range of Calculated incident energy Min. PPE Rating Clothing Required 0 0 to 1.2 cal/cm 2 N/A Untreated cotton to 4 cal/cm 2 4 cal/cm 2 FR shirt and pants 2 4+ to 8 cal/cm 2 8 cal/cm 2 Cotton underwear plus FR shirt and pants 25 cal/cm 2 Cotton underwear plus 3 8+ to 25 cal/cm 2 FR shirt and pants plus FR coveralls 40 cal/cm 2 Cotton underwear plus FR shirt, to 40 cal/cm 2 pants, plus multilayer layer flash suit
65 Personal Protective Equipment (PPE) Category 0 (Min. PPE Arc Rating N/A) Untreated Cotton Safety Glasses Category 1 (Min. PPE Arc Rating 4) Long Sleeve FR Shirt & Pants Hard Hat Safety Glasses Leather Gloves & Shoes
66 Personal Protective Equipment (PPE) Category 2 (Min. PPE Arc Rating 8) Cotton Underwear FR Shirt & Pants Arc Rated Face Shield Safety Glasses Hearing Protection Leather Gloves & Shoes Category 3 (Min. PPE Arc Rating 25) Same as Cat 2 but include FR coveralls & Flash Suit Hood
67 Personal Protective Equipment (PPE) Category 4 (Min. PPE Arc Rating 40) Cotton Underwear FR Shirt & Pants Full Flash Suit & Hood Hearing Protection Leather Gloves & Shoes
68 Labeling NEC Article requires arc flash labeling in electrical enclosures that might be maintained and accessed while energized. Switchboards, panelboards, industrial control panels, MCCs, etc.
69 Arc Flash Labeling
70 Warning Label Examples
71 Recent Example of Arc Flash Incident Electrician using multimeter shorted out resulting in three phase arc flash. Gloves and radiological PPE were melted and he suffered minor burns. Test equipment defective (CEN-TECH Digital Multimeter). No certification from a national testing laboratory.
72 KTR Associates
73 KTR Associates
74 KTR Associates
75 KTR Associates
76 KTR Associates
77 Sample Electrical Power Design Maintenance Mode Switch (utilizing Microprocessorbased Protective Relays Alternate Settings) Control cabinet containing switches to close breakers
78 What must I do to become NFPA 70E compliant? Conduct an Arc Flash hazard analysis. Provide labeling on electrical equipment per NEC article Flash Protection. Document your Electrical Safety Program. Provide training to your employees. Provide the proper tools and PPE for job tasks employee would be performing.
79 Other Issues to Think About Determine Qualified vs Un-Qualified Who s permitted to reset CBs? Anyone? Which methodology should I use for calculating incident energy? NPFA 70E IEEE 1584 Energized Work Permit when do I need this? Circuit Breaker Interrupting Ratings When do I apply OSHA ?
80 Don t Learn Safety by Accident KTR Associates
81 Don t Learn Safety by Accident Stop! Think! Then Act! NFPA 70E is your guide for Electrical Safety in the Workplace
82 Questions Thank-you for your interest!
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