NESC- 2012 – PART 4 WORK RULES CHANGES Objectives
2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update NESC- 2012 – PART 4 WORK RULES CHANGES Pam Tompkins, CSP, CUSP, CUSA President, SET Solutions, LLC Lexington, SC Objectives Consensus standards NESC scope Review how consensus standards are used Review state adoptions of the NESC-2012 Review the NESC update cycle NESC purpose Basic provisions 2012 changes NESC What is a consensus standard? SET Solutions, LLC www.setsolutionsllc.com 1 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Consensus Standards NESC NFPA 70E ANSI ASTM IEEE Others National Electric Safety Code National Fire Prevention Association American National Standards Institute American Society for Testing and Materials Institute of Electrical and Electronic Engineers Is the NESC a Legal Document? The NESC is a voluntary standard. Some editions and some parts of the Code have been adopted, with and without changes, by some states and local jurisdictional authorities. NESC OSHA Interpretation November 22, 2005 Please note that while OSHA does not enforce national consensus or industry standards directly, OSHA may consider such standards, including the National Electrical Safety Code (NESC), published by the Institute of Electrical and Electronic Engineers, Inc., when determining whether a hazard is "recognized" and whether there is a feasible means of abating such a hazard. SET Solutions, LLC www.setsolutionsllc.com 2 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Scope NESC (National Electric Safety Code) NESC covers: Supply and communication facilities including metering and associated work practices employed by: Public or private electric supply Communications Railway Trolley Street and area lighting Traffic signal or other signal Scope The generation, transmission, and distribution of electricity, lumens, communication signals and communication data through public and private utility systems that are installed and maintained under the exclusive control of utilities or their authorized representative. Scope Utility owned premises covered by NEC Office buildings Warehouses Garages Any facilities that are not an integral part of a generating plant, substation, or control center. SET Solutions, LLC www.setsolutionsllc.com 3 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update NESC vs NEC NEC- National Electric Code Covers facilities that do not generate, transmit or distribute electric power Typically facility wiring systems. NESC Revision Cycle The NESC is revised every 5 years NESC-2017 schedule July 15, 2013- Final date to receive change proposals September- October 2013- Committees meet and consider change proposals September 2014- Proposed amendments printed. Comment period opens. May 2015- Committee study period and comments- Comments due October 2015- Committees prepare final report January 2016- Proposed revision of NESC to NESC committee for letter ballot. May 2016- Committee approved revisions submitted to ANSI for recognition as an ANSI standard August 2016- Publication of the 2017 Edition of the NESC SET Solutions, LLC www.setsolutionsllc.com 4 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update NESC 2012 2012 CODE PUBLISHED AUG 1, 2011 EACH STATE RESPONSIBLE FOR ADOPTING NEW CODE MOST SOME STATES DO – IN SOME FASHION STATES DO NOT State Adoption NESC 2012 New edition of the code automatically adopted State Code State Code State Code AL 2012 ID 2012 MS 2012 AK AZ AR 2012 IL MO IN MT IA NE CA KS CO KY NV 2012 NH CT 2012 LA DE 2012 ME 2012 NJ NM DC MD 2012 NY 2012 FL MA NC 2012 GA MI ND HI MN 2012 OH State Adoption NESC 2012 New edition of the code automatically adopted State Code OR State UT PA 2012 VT RI 2012 VA SC 2012 WA SD WV TN WI TX Code 2012 WY 2012 2012 2012 Note: The information from the survey was complied and distributed for informational purposes only. This information is not i ntended to provide an interpretation of the data received. IEEE is not responsible for verifying the accuracy of information provided by the Commissions. SET Solutions, LLC www.setsolutionsllc.com 5 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Purpose Better clarification for 2012 Purpose Practical safeguarding during installation, operation and maintenance of electric supply and communication facilities for: Persons Utility facilities Affected property Basic Provisions Necessary for the safeguarding of: The public Utility workers (employee and contractors) Utility facilities Electric supply and communication equipment connected to utility facilities, and Other facilities or premises adjacent to or containing utility facilities. SET Solutions, LLC www.setsolutionsllc.com 6 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update NESC Divided into one section and four (4) parts: Section 9- Grounding methods for electric supply and communication facilities Part 1- Electric supply stations Part 2- Safety rules for overhead lines Part 3- Safety rules for underground lines Part 4- Work rules NESC Part 4 Additional rules for supply employees General Energized conductors or parts Switching control procedures Work on energized lines and equipment De-energizing equipment or lines to protect employees Protective grounds Live work Protection against arcing and other damage while installing and maintaining insulators and conductors 410. General Requirements A. General 2. Changes the word facilities to lines and parts. The employer shall provide training to all employees who work in the vicinity of exposed energized lines and parts. SET Solutions, LLC www.setsolutionsllc.com 7 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update 410 General Requirements A. General 3. Requires each employer to perform an arc hazard assessment for employees who work on or near energized lines, parts or equipment at 50V to 800 kV. Picture used by courtesy of Westex, Inc. 410. A. General 3a. Requires employers to determine the effective arc rating of clothing or clothing systems to be worn by employees working on or near energized lines, parts, or equipment at voltages 50V-800 kV by one of the following methods: Perform a detailed arc hazard analysis. Use tabulated values in tables provided. Table 410-1 (50V-1000V) 410-2 (1.1kV-46kV) Table 410-3 (46.1kV-800kV) Table Table 410-1 Clothing and clothing systems for voltages 50-1000V Nominal voltage range and cal/cm2 Equipment type 50-250 V 251-500 V 501-1000 V •Self–contained meters/cabinets 4 20 30 •Pad-mounted transformers 4 4 6 •CT meters and control wiring 4 4 6 •Metal-clad switchgear/motor control centers 8 40 60 •Pedestals/pull boxes/hand holes 4 8 12 •Open air (includes lines) 4 4 6 SET Solutions, LLC www.setsolutionsllc.com 8 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Table 410-1 (continued) Clothing and clothing systems for voltages 50-1000V Nominal voltage range and cal/cm2 Equipment type •Network protectors 50-250 V 251-500 V 501-1000 V 4 Footnote 11 Footnote 11 Footnote 10 •Panel boards-single phase (all)/three phase (<100A) 4 8 12 •Panel boards-three phase (>100A) 4 Footnote 13 Footnote 13 Footnote 11- Industry testing on 480V network protectors indicates arcs will not selfextinguish and heat flux rates will exceed 60 cal/cm2/s at 24 in working distance. Perform arc hazard analysis. (See Eblen and Short [B31].) Footnote 13- Industry testing on panelboards with edge-mounted, parallel bus bars indicate arcs will not self-extinguish and heat flux rates will exceed 60 cal/cm2/s at 18 in working distance. Perform arc hazard analysis. (See Eblen and Short [B31].) Other Footnotes- Many that relate to testing criteria Updated Tables Table 410-2- Clothing and clothing systemsvoltage, fault current and maximum clearing times for voltages 1.1 kV to 46 kV ac Table 410-3- Live-line tool work clothing and clothing systems- voltage, fault current and maximum clearing time for voltages 46.1 kV to 800 kV ac Major changes throughout the table 410. A. General 3b. Wording changeEnsure acetate, nylon, polyester or polypropylene is not worn unless the material is flame resistant. SET Solutions, LLC www.setsolutionsllc.com 9 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update 410. A. General 3b. Added Note 1: Assessments performed to determine potential exposure to an electric arc consider the affected employee’s assigned tasks and/or work activities. 410. A. General 3b. Changed original Note 1 to Note 2Added natural fiber to non-flame resistant material. Committee discussion concerning clothing systems. Note- This is a major difference between NESC and NFPA-70E 410. A. General 3b. Changed original Note 2 to Note 3Added Utilizing engineering controls to reduce arc energy levels and work practices to reduce exposure levels. SET Solutions, LLC www.setsolutionsllc.com 10 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Supporting Comments Subcommittee 8 Established a low-voltage arc flash work group (WG). Evaluate minimum clothing or clothing system requirements for employees working on voltages less than 1000 volts. PG&E completed tests during 2008 to determine the arc flash characteristics of 480 V selfcontained metering equipment by creating fault conditions at various kA levels. WG collaborated with PE&G on tests. Application of an accepted industry standard (IEEE-1584IEEE Guide for Performing Arc Flash Hazard Calculations2002) Supporting Comments Subcommittee 8 The new table (410-1) uses an 18 inch worker separation. Unlike the existing higher voltage tables which uses a 15 inch worker separation. The WG committee based the change on the application of IEEE 1584 test methodologies and typical working distances for low-voltage motor control centers and panel boards. The employee working distance is based on the incident energy on the worker’s face and body not on the hands and arms. Clause 9 (Change Proposals) Flame-resistant protective clothing and personal protective equipment Gives good methodology for arc flash risk factors to consider such as: Equipment condition Work methods Task elements Incident energy specifics Flash hazard analysis Introduces arc flash protection boundary. SET Solutions, LLC www.setsolutionsllc.com 11 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Arc Flash Protection Boundary A calculated distance away from the potential arc source at which an employee would not be expected to receive more than a secondary degree burn. The arc flash protection boundary is located at a distance where the incident energy is measured at 1.2 cal/cm2 Incident Energy Measured from the arc potential to the employees face and/or torso Arc flash protection boundary 1.2 cal/cm2 Possible Risk Factors Equipment condition Equipment failure record Equipment showing visible signs of distress Work methods Task requires exposing energized part. Opening door Removing access panel Ease of movement Open area Confined space Working position SET Solutions, LLC www.setsolutionsllc.com 12 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Possible Risk Factors Work methods Access methods Ladder Structure steel Aerial lift Climbing Helicopter Level of training to perform job Definition of working “near” energized parts. Definition of working “on” energized parts Possible Risk Factors Work methods Work method used De-energized Rubber gloves line tools Live line barehand Live Status of LOTO/switchingtagging Possible Risk Factors Task Elements Task requires a circuit transitional change. Opening a breaker a disconnect switch Lifting a jumper Replacing a fuse Opening Working on exposed energized parts. SET Solutions, LLC www.setsolutionsllc.com 13 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Possible Risk Factors Crew has the enough employees to complete the work safely. Task history? Other Environment Weather Lighting Cleanliness of area Possible Risk Factors Incident energy specifics Level of possible incident energy Distance from possible source Voltage involved Arcing fault current Flash hazard analysis Clause 9- Change Proposals Flame-resistant protective clothing and personal protective equipment Give methodology for calculations for incident energy levels on low voltage systems. Examples include: Single phase, overhead or pad-mounted 120/240V transformers. Three phase, overhead or pad-mounted 120/208V and 277/480V transformers. Three phase spot network, 277/480V 500, 1000, 2000 kVA transformers in various banks. Three phase network, 120/208V 500 kVA transformers in 3 and 6 feeders. SET Solutions, LLC www.setsolutionsllc.com 14 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update 410. General Requirements B. Emergency procedures and first aid rules procedures Change in wordingEnsures copies of emergency and first aid procedures are accessible to employees where they work. 410. General Requirements C. Responsibility A designated person shall be in charge of the operation of the equipment and lines and shall be responsible for their safe operation. 411. Protective Methods and Devices A. Diagrams Diagrams, showing the arrangement and location of the electric equipment and lines shall be maintained and shall be readily available to employees. SET Solutions, LLC www.setsolutionsllc.com 15 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update 411. Methods C. Inspection and testing of protective devices Changed terms line worker's body belts, lanyards and positioning straps and other personal equipment to: Climbing and fall protection equipment. Requires an inspection before use to ensure the climbing and fall protection equipment are in safe working condition. 411. Protective Methods and Devices D. Safety Signs and Tags Safety signs and tags shall comply with the provisions of ANSI Z535.1-2006 through ANSI Z535.5-2007. Safety Signs and Tags The grouped safety messages appear with the words: “Danger”- Red- Hazard will cause injury “Warning” – Orange- Hazard could cause injury “Caution”- Yellow- Hazard may cause injury “Notice”- Blue- Notice information SET Solutions, LLC www.setsolutionsllc.com 16 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Safety Signs and Tags 411 Fall Protection F. Fall Protection Non- locking snap hooks shall not be permitted. SECTION 42 GENERAL RULES FOR EMPLOYEES SET Solutions, LLC www.setsolutionsllc.com 17 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update 420. Personal General Precautions A. Rules and emergency methods Employees shall study and know safety rules pertaining to their jobs. B. Qualification of employees Employees shall perform only tasks for which they are trained. 420. General C. Safeguarding oneself and others Employees shall report any of the following to the proper authority: Line or equipment defects to include abnormally sagging wires, broken insulators, broken poles or lamp supports. Accidently energized objects such as conduits, light fixtures or guys. Other defects that may cause a dangerous condition. 421. General Operating Routines A. Duties of first-level supervisor or person in charge Have the authority to prevent accidents. Ensure safety rules and procedures are followed. Keep necessary records and reports. Prevent unauthorized persons from approaching work sites. Prohibit the use of unsuitable tools and equipment and tools and equipment that has not been tested or inspected. Conduct a Job Briefing SET Solutions, LLC www.setsolutionsllc.com 18 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update 421. Job Briefing Job briefing requirement Employees shall be required to conduct a job briefing before beginning work....... NESC-2007does not contain a specific requirement to conduct a job briefing. The job briefing shall cover at the least the following: Hazards associated with the job. Work procedures involved Special precautions Energy source controls PPE requirements. 422 A. Setting moving or removing poles in or near energized electric supply lines NESC-2007 words “not bonded to an effective ground” was removed. States: Contact with trucks, or other equipment that is being used to set, move, or remove poles………shall be avoided by employees standing on the ground or in contact with grounded objects unless employees are wearing suitable protective equipment. SECTION 44. ADDITIONAL RULES FOR SUPPLY EMPLOYEES SET Solutions, LLC www.setsolutionsllc.com 19 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Section 44 Additional rules for supply employees 441. Energized conductors or parts (MAD tables) Table 441-1 AC Table DC Table live work minimum approach distance 441-2 live work minimum approach distance 441-3 Altitude correction Table factor 441-4 Maximum use voltage for rubber insulting equipment Minimum Approach Distances Problem IEEE 516-2009 has been approved and is available for purchase. Major changes were made in regards to MAD distances in IEEE 516-2009. OSHA reopened the comment period two times to ensure time for IEEE 516-2009 to be approved. Will OSHA use IEEE 516-2009 and not NESC which is an IEEE approved standard! Minimum Approach Distances 441A Note 3Methodology for calculating minimum approach distances (MAD) were taken from IEEE std 516-2009 Table 441-1 AC live work minimum approach distance Changes to voltages (301V- 800 kV) Added distance to employee from energized part (transmission voltages 72.6-800 kV) Without tools phase-to-ground With tools phase-to-ground Without tools phase-to-phase SET Solutions, LLC www.setsolutionsllc.com 20 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update Table 441-1 AC Live-Work MAD Voltage in kV phase to phase Distance to employee Phase to ground (m) 0 to .050 (ft-in) Not specified 0.051 to 0.300 Phase to phase (m) (ft-in) Not specified Avoid contact Avoid contact 0.301 to 0.750 0.32 1-1 0.32 .751 to 15 0.64 2-2 0.67 1-1 2-3 15.1 to 36 0.73 2-5 0.84 2-10 36.1 to 46.0 0.79 2-7 0.94 3-1 46.1 to 72.5 0.89 2-11 1.15 3-9 Table 441-1 AC Live-Work MAD Voltage in kV phase to phase Distance to employee from energized part Without tools With tools Without tools phase to ground phase to ground phase to phase (m) (ft-in) (m) (ft-in) (m) (ft-in) 72.6 to 121 .94 3-1 1.01 3-4 1.37 4-7 121.1 to 145 1.07 3-7 1.115 3-10 1.62 5-4 145.1 to 169 1.20 4-0 1.29 4-3 1.88 6-3 169.1 to 242 1.58 5-3 1.71 5-8 2.77 9-2 242.1 to 362 2.56 8-5 2.75 9-1 4.32 14-3 362.1 to 550 3.38 11-1 3.61 11-11 6.01 19-9 550.1 to 800 4.54 14-11 4.82 15-10 8.87 29-2 Minimum Approach Distances Table 441-2 DC live work minimum approach distance Added distance to employee from energized part (transmission voltages 72.6-750 kV) Without tools With tools pole-to-ground pole-to-ground SET Solutions, LLC www.setsolutionsllc.com 21 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update 444 D. Employee’s Protective Grounds Remove- Grounds shall be placed at each side of the work location and as close as practical to the work location……… Add- Temporary protective grounds shall be placed at such locations and arranged in such a manner that affected employees are protected from hazardous differences in electrical potential. 444 D. Employee’s Protective Grounds Note addedTouch and step potentials. Additional measures may include barriers, insulation, isolation or grounding mats. Picture courtesy of AB Chance Company 444 D. Employee’s Protective Grounds Exception added: Alternative work methods such as isolation of equipment, lines and conductors from all sources including induced voltages may be employed when the employer has assured worker protection from hazardous differences in electrical potential. SET Solutions, LLC www.setsolutionsllc.com 22 2011 ES&H EFCOG National Electric Safety Code- 2012 Part 4- Work Rules Update 445. B.3. Removing Grounds Note 1- added Hazards due to electric and magnetic field induction may exist when conductors, cables and equipment are parallel or cross other energized circuits. References OSHA, Line Contractors strategic Partnership- IEEE report Hugh Hoagland- Arc Wear OSHA NFPA 70e Salisbury Protective Products Testing update on protective clothing and equipment for electric arc exposure, IEEE HD Electric Arc Flash Phenomena- Collaborative Research Project- IEEE Synergetic Design OSHA Brent McKinney- NESC- APPA Subcommittee member Arcing Flash/blast review with safety suggestions for design and maintenance Tim Crnko, Steve Dyrnes Pamela (Pam) T. Tompkins, CSP, CUSA President 710 East Main Street Lexington, SC 29072 (803) 407-4707 Mobile (803) 917-1537 [email protected] www.setsolutionsllc.com SET Solutions, LLC www.setsolutionsllc.com 23
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