WHAT IS THE N.F.P.A. 70E

Transcription

1 WHAT IS THE N.F.P.A. 70E

2 N.F.P.A. 70E Standard for Electrical Safety in the Workplaces

3 HAZARDS of ELECTRICITY FIRE-Faulty wiring-building fires. Clothing fires(arc flash). SHOCK-When electrical current enters and exits the body creating a path. FLASH-A dangerous condition associated with the release of energy caused by an electric arc. This explosive condition includes a broad spectrum of electromagnetic energy, plasma, fragments and a spray of molten materials. (As much as 80% of all electrical injuries are burns resulting from an arc-flash and ignition of flammable clothing) BURN / BLAST-Pressure wave caused by the expansion of gases and conducting materials with flying molten materials.(arc temperature can reach 35,000 F - this is four times hotter than the surface of the sun. Fatal burns can occur at distances over 10 ft.)

4 Electrical Hazards - Shock ANY VOLTAGE OVER 50 VOLTS (AC or DC) CAN BE A POTENTIAL SHOCK HAZARDS

5 Electrical Hazards - Shock SHOCK INJURIES: SHOCK REACTION ELECTROCUTION BODY TISSUE DAMAGE BODY ORGAN DAMAGE SUFFOCATION

6 SHOCK POTENTIAL SEC. FIBRILLATION Milli-amps PAINFUL SHOCK (Let Go Threshold) Milliampere Affect on Person Tingling sensations 3+ Shock 10+ Muscle contractions and pain 30+ Respiratory paralysis 60+ Heart Paralysis (may be fatal) 100+ Ventricular fibrillation (usually fatal) 4+ Amps Heart Paralysis 5+ Amps Tissue and Organs start to burn 0.3 SEC. FIBRILLATION MUSCULAR CONTRACTION SLIGHT SENSATION Volts

7 Electrical Hazards - Shock EVERY ELECTICAL SHOCK HAS THE POTENTIAL OF FATALITY

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9 Shock Hazards-----Electrocution

10 Electrical Hazards - ARC FLASH An arc flash is the energy released as a result of an arcing. ARC FLASH INJURIES: FLASH BURNS BURNS from CLOTHING BLAST SHRAPNEL BLAST PRESSURE HEARING LOSS

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14 PPE Clothing, but no Arc Shield

15 HISTORY of ELECTRICAL SAFETY 1897 FIRST ELECTRIC CODE 1911 NFPA TAKE OVER N.E.C 1930 FIRST STUDIES of ELEC SHOCK AS A HAZARD 1950 s ELECTRICAL SHOCK TAKEN SERIOUSLY

16 HISTORY of ELECTRICAL SAFETY 1968 FIRST GFIC REQ in NEC 1970 OSHA LAWS PASSED 1979 NFPA PUB. 1ST 70E 1981 OSHA ADDS 1910 SUB-S 1982 FIRST PUB STUDIES of ELEC ARC FLASH HAZARDS

17 HISTORY of ELECTRICAL SAFETY 1994 NAT L ELECTRICAL SAFETY FOUNDATION ORGANIZED (NESF) 1995 NFPA 70E ADDS ARC FLASH & BOUNDARIES 1998 AFCI ADDED to NEC

18 HISTORY of ELECTRICAL SAFETY 2002 FLASH PROTECTION LABELING add to NEC 2003 OSHA, NECA, & IBEW SETTING UP MODEL PROGRAMS USING NFPA-70E 2004 ENERGIZED WORK PERMIT added to NFPA-70E-Guidelines for Training, Outside Contractor Communication, Electrical Hazard Analysis, and simplified format.

19 What is the NFPA 70E-2004 NFPA 70E is: National consensus standard and a Standard for Electrical Safety in the Workplace and is a part of the National Electrical Code and has been adopted by OSHA as an enforcement standard.

20 Safety Overview--Today Electrical safety is the most over-looked employee work hazard OSHA Published top 10 most violated standards. Electrical violations is fourth. Electrocution is fourth in work related fatalities with a majority of these incidents occurring at 600 volts or less. 277 work related deaths last year Source: Bureau Labor Statistics ,600 disabling and non-disabling electrical injuries occur in the US each year. Currently there is confusion industry wide concerning electrical safety procedures and electrical safety products. Prevailing mindset of the electrical industry with management and labor is It won t happen to me - Famous last words.

21 ELECTRICAL SAFETY CHART GENERAL EMPLOYEE SAFETY FIRE SHOCK FLASH BURN / BLAST NFPA NEC 70 NFPA 70E O.S.H.A SUBPART S PROPERTY PROTECTION PEOPLE PROTECTION BUSINESS LOSS $$$

22 HISTORY of N.F.P.A. 70E 1975 STD CONCEPT & SCOPE STARTED to assist OSHA 1979 FIRST EDITION of 70E nd EDITION of 70E rd EDITION of 70E th EDITION of 70E

23 HISTORY of N.F.P.A. 70E th EDITION of 70E introduced the Arc Flash Concept th EDITION of 70E Adds Additional Arc Flash Information 2002 FLASH PROTECTION LABELING added to NEC th Edition of 70E Adds Hot Work Permit, simplified format. Training, Communication, Planning, and Documentation guidelines.

24 What's in NFPA 70E-2004 PART-I Safety-Related Work Practices. PART-II Safety-Related Maintenance Req. PART-III Safety Requirements for Special Equipment. PART-IV Installation Safety Requirements. Equipment APPENDIX: C - Limits of Approach D Sample Calculation Arc Flash Flash Boundary E - Electrical Safety Program F - Hazard / Risk Evaluation G - Lockout / Tag out Procedures H - Flame-Resistant Clothing 2004 I Job Briefing and Planning Checklist 2004 J Energized Electrical Work Permit

25 NFPA-70E 2004 Article Scope. What s covered. This standard address those electrical safety requirements for employee workplaces that are necessary for the practical safeguarding of employees in their pursuit of gainful employment. This standard covers the installation of electric conductors, electric equipment, signaling and communication conductors and equipment, and raceways for the following: 1. Public and Premises, including buildings, structures, mobile homes, recreational vehicles and floating buildings. 2. continued---

26 NFPA-70E 2004 Article Scope. What s covered. 2. Yards, lots, parking lots, carnivals, and industrial substations. 3. Installation of conductors and equipment and connect to the supply of electricity. 4. Installation used by the electric utility, such as office buildings, warehouses, garages, machine shops and recreational buildings, that are not an integral part of a generating plant, substation, or control center.

27 NFPA-70E 2004 Article Scope. Chapter 1 covers electrical safety-related work practices and procedures for employees who work on or near exposed energized electrical conductors or circuits parts in workplaces that are included in the scope of this standard. Electrical circuits and equipment not included in the scope of this standard might present a hazard to employees not qualified to work near such facilities. Requirements have been included in Chapter 1 to protect unqualified employees from such hazards.

28 NFPA-70E 2004 Article Responsibility. The Safety-related work practices contained in chapter 1 shall be implemented by employees. The employer shall provide the safety-related work practices and shall train the employee who shall then implement them.

29 NFPA-70E 2004 Article Outside Personnel. (Contractors, etc.) Whenever outside servicing personnel are to be engaged in activities covered by the scope and application of this standard, the onsite employer and the outside employer(s) shall inform each other of existing hazards, personal protective equipment/clothing requirements, safe work practice procedures, and emergency /evacuation procedures applicable to the work to be preformed. This coordination shall include a meeting and documentation.

30 NFPA-70E 2004 Article (A) Safety Training. The training requirements contained in this section shall apply to the employees who face a risk of electrical hazard that is not reduced to a safe level by the electrical installation requirements of chapter 4. Such employees shall be trained to understand the specific hazards associated with electrical energy. They shall be trained in safety-related work practices and procedural requirements as necessary to provide protection from electrical hazards associated with their respective job or task assignments. Employees shall be trained to identify and understand the relationship between electrical hazards and possible injury.

31 NFPA-70E 2004 Article Electrical Safety Program. (A) General. The employer shall implement an overall electrical safety program that directs activity appropriate for the voltage, energy level, and circuit condition. (B) Awareness and Self-Discipline. (C) Electrical Safety Program Principles. (D) Electrical Safety Program Controls. (E) Electrical Safety Program Procedures. (F) Hazard/Risk Evaluation Procedures. (G) Job Briefing. 1 General. Before starting each job, the employee in charge shall conduct a job briefing with the employees involved.

32 NFPA-70E 2004 Article Justification for Work. Live parts to which an employee might be exposed shall put into an electrically safe work condition before an employee works on or near them, unless the employer can demonstrate that deenergizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations. Energized parts that are operated at less than 50 volts to ground shall not be required to be deenergized if there will be no increased exposure to electrical burns or to explosion due to electric arcs.

33 NFPA-70E 2004 Article (A) Energized Electrical Work Permit. Where Required. If live parts are not placed in an electrically safe work condition (I, e., for the reason of increased or additional hazards or infeasibility per 130.1), work to be performed shall be considered energized electrical work and shall be performed by written permit only Exemption to work Permit. Testing and trouble shooting---not Required. PPE is Required for testing and trouble shooting.

34 Flash Protection(2002 NEC) Switch boards, panel boards, industrial control panels and motor control centers that are other than dwelling occupancies and are likely to require examination, adjustment, servicing, or maintenance while energized shall be field marked to warn qualified person of potential electric arc hazards. The marking shall be located so to be clearly visible to the qualified person before examination, adjustments, servicing, or maintenance of the equipment.(nfpa 70E )

35 Minimum Warning

36 Advanced Warning

37 Limits of Approach Two type of persons (definition 110.6(D)2) Unqualified Persons must not cross the limited approach boundary not cross the flash protection boundary unless wearing PPE and be closely supervised by qualified person.

38 Limits of Approach

39 Limits of Approach Qualified Persons must (definition 110.6(D)1) be qualified to perform the task/job in order to cross the limited approach boundary and must be Trained. determine the flash protection boundary and hazard level not cross the flash protection boundary unless wearing PPE...

40 110 Flash Hazard Analysis (b) Flash hazard analysis shall be done before a person approaches any exposed electrical conductor or circuit part that has not been placed in electrical safe work condition. This qualifies for the above--most testing and troubleshooting is done on live circuits(fr clothing and gloves are required).

41 130 Flash-Limits of Approach Flash Protection Boundary 130.3(A) For systems which are 600 volts and below, the flash protection boundary shall be 4 feet based on clearing time of 6 cycles). This can extend out to 10 feet or till the the incident energy level equals 1.5 cal/cm 2. Boundary should be setup to keep others out.

42 130 Limits of Approach Flash approach boundary NFPA (A) 130.3(A) calculation formula. Duke Energy FREEWARE program available on: Certified Insulated Products websiteinsulatedtools.com-download- flux.exe Freeware need to know» fault current, arc gap, supply voltage, distance to person and number of cycles.» 3 phases times 3/Box factor times 2 Others are commercially available.

43 Limits of Approach Flash approach boundary Rule of thumb for 600 volts or less is 4 ft when; fault current is 50kA or less clearing time 6 cycles (0.1 seconds) breakers est. 6 cycles current limiting fuse 1/4 cycle

44 Calculating Arc Flash NFPA 130.3(A) Protective Clothing and PPE Equipment for applications with a Flash Hazard Analysis. employer shall document the incident energy exposure of the worker in cal/cm2 (Flash Hazard Analysis) For information on estimating Incident Energy. See Annex D NFPA 70E 2004

45 130 - Calculating Arc Flash NFPA (con t) as an alternative, the PPE requirement of 130.3(A)(calucalation method)--- A Hazard/Risk Category Chart System (C)(9))(a) shall be permitted to be used in lieu of the detailed flash hazard analysis using the calculation approach.

46 Clothing Not Permitted-PPE 130.7(C) (14). Clothing made from Synthetic materials such as acetate, nylon, polyester, rayon, either alone or in blends with cotton, shall not be worn. The most severe burns are caused by ignited clothing, not by the original Flash Fire or Electrical Arc Exposure. Clothed areas can be burned more severely than exposed skin.

47 Personal Protective Equipment Table 130-7(c)(9)(a) Hazard Risk Category Classifications pages 70E thru 31 Based on task, voltage, type of equipment and notes (fault current and clearing time) the table shows: hazard / risk category if V-rated gloves are required if V-rated tools are required For any task, voltage, fault current or clearing times not listed in the table do the calculation outlined in 130.3(a) page 70E-25

48 Personal Protective Equipment Protective Clothing (non melting) hazard / risk category to PPE page 70E-34 0 untreated cotton ATPV n/a 1 FR shirt and FR pants ATPV 4 cal/cm2 2 cotton underwear plus FR shirt and FR pants ATPV 8 cal/cm2 3 cotton underwear plus FR shirt and FR pants plus FR coverall ATPV 25 cal/cm2 4 cotton underwear plus FR shirt and FR pants plus double layer switching coat and pants ATPV 40 cal/cm2.» ATPV=arc thermal performance value» Cal/cm2. (Calories per Sq. Centimeter)

49 NFPA 70E Hazard Risk 0 0-untreated cotton ATPV n/a This hazard risk category poses minimal risk. Some examples of tasks in this category are tasks that involve: Circuit breaker or fused switch operation with covers on when working with Panel boards rated 240 V and below. Contactor operation with enclosure doors closed when working with NEMA E2 (fused contactor) Motor Starters, 2.3 kv through 7.2 kv.

50 NFPA 70E Hazard Risk 1 1-FR shirt and FR pants ATPV 4 cal/cm2 This hazard risk category poses some risk. Some examples of tasks in this category are tasks that involve: Circuit breaker or fused switch operation with covers off when working with Panel boards rated 240 V and below. Opening hinged covers (to expose bare, energized parts) when working with "Other 600 V Class (277 V through 600 V, nominal) Equipment.

51 NFPA 70E Hazard Risk 2 2-cotton underwear plus FR shirt and FR pants ATPV 8 cal/cm2 This hazard risk category involves tasks that pose a moderate risk. Some examples of tasks in this category are tasks that involve: Circuit breaker or fused switch operation with enclosure doors closed when working with 600 V Class Motor Control Centers (MCCs). Work on control circuits with energized parts 120 V or below, exposed when working on Metal Clad Switchgear, 1 kv and above.

52 NFPA 70E Hazard Risk 3 3-cotton underwear plus FR shirt and FR pants plus FR coverall ATPV 25 cal/cm2 This hazard risk category involves tasks that pose a high risk. Some examples of tasks in this category are tasks that involve: Insertion or removal of circuit breakers from cubicles, doors open, when working with 600 V Class Switchgear (with power circuit breakers or fused switches). Opening hinged covers (to expose bare, energized parts) when working with "Metal Clad Switchgear, 1 kv and above.

53 NFPA 70E Hazard Risk 4 4-cotton underwear plus FR shirt and FR pants plus double layer switching coat and pants ATPV 40 cal/cm2 This hazard risk category represents tasks that pose the greatest risk. Some examples of tasks in this category are tasks that involve: Removal of bolted covers (to expose bare, energized parts) when working with NEMA E2 (fused contactor) Motor Starters, 2.3 kv through 7.2 kv. Opening voltage transformer or control power transformer compartments when working with Metal Clad Switchgear, 1kV and above.

54 Personal Protective Equipment Face shields are available that are listed with ATPV ratings from many manufactures... Do not use general duty face shield. always wear safety glasses under face shields always wear a hard hat hearing protection is recommended protective hoods or parkas should be worn in conjunction with shields and hard hats

55 Personal Protective Equipment Voltage rated gloves gloves rated for the proper voltage shall be worn when called for leather protectors shall be worn over gloves gloves must be inspected every 6 month by qualified lab

56 Personal Protective Equipment Gloves rated by voltage» Class 00 = 500 volts max» Class 0 = 1000 volts max» Class 1 = 10 kv max» Class 2 = 20 kv max Shoes Heavy-duty leather work shoes shall be used for all tasks when ATPV is 5 cal/cm2 and above. insulating soles are recommended overshoes or dielectric boots are recommended.

57 Personal Protective Equipment Voltage rated tools shall be rated for the voltage on which they are used shall be double insulated built to ATSM F1505 standards(double triangle marking) many tool are available in composite construction rated at 1000 volts, tested to 10,000 volts» 3M 33+ wrapped tool is not an insulated tool tool must be inspected before each use

58 Creating an Electrical Safety Program-OSHA 29CFR (a) General. Safety-related work practices shall be employed to prevent electric shock or other injuries resulting from either direct or interact contacts, when work is performed near or on equipment or circuits which are or may be energized. The specific safety-related work practices shall be consistent with the nature and extent of the associated electrical hazards.

59 Personal Protective Equipment NFPA 70E 130-7(a) General (who s responsible) Employees working is areas where there are electrical hazards shall be provided with, and shall use, protective equipment that is designed and constructed for the specific part of the body to be protected and for the work to be performed OSHA Safeguards for personal protection: (a)use of protective equipment. (1) Personal protective equipment. Employees working in areas where there are potential electrical hazards shall be provided with, and shall use, electrical protective equipment that is appropriate for the specific parts of the body to be protected and for the work to be performed.

60 Warning Signage (C) Warning Signs Entrances to rooms and other guarded locations that contain exposed live parts operating at 50 volts shall be marked with conspicuous warning signs marked to warn of potential electric arc flash hazard (NEC /2004 NFPA 70E ) more detailed information is recommended, see Lock/Tag out Procedures Article E

61 Why Do I Need Electrical Safety PPE? OSHA/NFPA 70E regulations - For energized circuits over 50 volts or more, safety tools and protective equipment must be used. Safe work environment. Reduced insurance rates. Improved worker morale. It s the law!

62 Who s Responsible for Safety? The Employer is responsible for complying with OSHA requirements, electrical safety program, safety policies, procedures and Safety Training. The Employee is responsible for implementing procedures. The Plant/Jobsite Owner is inherently responsible for Contractors on site.

63 Summary Electricity is dangerous. Any contact with electricity can be fatal. OSHA is using the NFPA 70E PPE is required over 50volts when working hot when troubleshooting and testing for de-energized circuit Do not work it hot every day in the USA at least one professional electrician is killed by electricity

64 Statistics on Electrical Injuries 2/3 of all injuries are from Electric Shock 1/3 are from Arc Flash Burns

65 Chance of Survival % % Body Burn 50% Body Burn 75% Body Burn Age Group

66 Injury costs can last a lifetime A study of one utility revealed these costs of a survivable serious electrical injury Immediate direct costs $250,000 Direct costs after year 1.. Indirect costs Total.. $1.3 million $11.24 million $12.8 million* *1991 dollars. Equivalent in 2003 dollars is $17.4 million

67 Products for Life Composite Tools Leading Edge Technology Inherent safety the insulating properties are built into the tool, not coat into it. Lightweight. Better Balanced. Exceeds ASME torque standards. Exceeds the strength of the proper fastener. One year warranty.

68 Products for Life Insulated tool kits that meet the ASTM F1505 Standard. The tools are tested at 10KV and rated at 1000V and are to be used when working with energized equipment.

69 Products for Life Electricians Belt Pouch & 7.5KV PVC Insulating Roll

70 Products for Life Socket Set/New 10 cal Arc Shield/Class 00 Gloves

71 Products for Life CIP offers the most complete line of Flash Protection available. Protection from 5 cal to 100 cal ATPV. Available in complete kits-ready to go.

72 Products for Life Over 600 tools in our catalog!

73 Products for Life Insulating Shielding Sleeves Switchboard matting Grounding Sets Safety Rescue hook

74 SHOCK HAZARD / RISK ANALYSIS VOLTAGE LEVEL APPROACH BOUNDARIES PROHIBITED RESTRICTED LIMITED SELECT PPE JOB TASK JOB PLAN ARC FLASH ENERGY LEVEL PROTECTION BOUNDARIY SELECT PPE JOB TASK

75 N.F.P.A. 70E WILL BE THE Standard for Electrical Safety in the Workplaces.

76 REFERENCES: NFPA 70E Standard for Elec. Safety in the Workplace Elec. Safety in the Workplace by J. G. & R. A.Jones Electrical Safety Handbook by J. Cadick IEEE STD-1998 (Yellow Book) Guide for Maint., Oper.,& Safety.