The National Electrical Safety Code NESC Presented by

The National Electrical Safety Code ("NESC") Presented by Lauren E. Gaunt, P. E. Principal Engineer, Eversource Energy Senior Member, IEEE Mark A. Konz, P. E. Customer Service Organization Training Supervisor, Gulf Power Company U. S. -- Africa Clean Energy Standards Program Clean Energy and Electrical Safety Workshop May 16, 2016 Cape Town, South Africa

Introduction to the National Electrical Safety Code ("NESC") • The NESC is a consensus standard prepared by the National Electrical Safety Code Committee under procedures approved by ANSI. • NESC Committee membership includes national and international organizations. Is certified by ANSI as having an appropriate balance of the interests of members of the public, utility workers, regulatory agencies, and the various types of private and public utilities. • The NESC is used in whole or in part by statute, regulation, or consent as the standard (or basis of the standard) of safe practice for public and private utilities in the United States, as well various jurisdictions and industries in other countries. 3

Without a Set of Safety Rules… What Might Happen? . . . 4

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NESC: 100 Years of Safety • U. S. Congressional mandate — In 1913, the US Congress requested the National Bureau of Standards (“NBS”) to develop the NESC to bring consistency and safety to the design, construction, operation, maintenance and use of electric supply and communications throughout the United States • Industry consensus sought ― NBS brought together representatives from electric utilities, telephone utilities, railroads, and factory owners to identify and discuss commonalities between systems, common problems, and potential solutions • Standardization needed — Early electric supply and communication systems were isolated systems constructed without standardization of clearances, strengths of materials, construction methods or operation, causing problems for both public vehicles and electrical workers travelling from one area to another or working in different manufacturing facilities 6

NESC: The IEEE Role In 1972, IEEE was designated as the secretariat for the NESC. The IEEE performs all administrative functions for the NESC Committee. The IEEE is the publisher of the NESC and owns the copyright for NESC. • Permission must be obtained from IEEE to use portions of NESC • Permission not required to reference NESC The NESC continues to be a stronghold in the U. S. electrical industry and communications utility field, and serves as the authority on safety requirements for power, telephone, cable television, and railroad signal systems. 7

NESC Purpose The purpose of the NESC is the practical safeguarding of persons, and utility facilities during the installation, operation, and maintenance of electric supply and communication facilities, under specified conditions. NESC rules contain the basic provisions, under specified conditions, that are considered necessary for the safeguarding of: 1. The public, 2. Utility workers (employees and contractors), and 3. Utility facilities. NESC rules are intended to provide a standard of safe practices that can be adopted by public utilities, private utilities, state or local utility commissions or public service commissions, or other boards or bodies having control over safe practices employed in the design, installation, operation, and maintenance of electric supply, communication, street and area lighting, signal, or railroad utility facilities. The NESC is not intended as a design specification or as an instruction manual. 8

The NESC covers: (List Not Comprehensive) 1. Supply and communication facilities (including metering) and associated work practices employed by a public or private electric supply, communications, railway, trolley, street and area lighting, traffic signal (or other signal), irrigation district or other community owned utility, or a similar utility in the exercise of its function as a utility. 2. 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 representatives. 3. Utility facilities and functions of utilities that (a) either generate energy or signals or accept energy or signals from another entity and (b) provide that energy or signals through a delivery point to another entity. 9

The NESC does not cover: (List Not Comprehensive) 1. Utilization equipment or premises wiring located beyond utility service points to buildings or outdoor installations, or 2. Underground mine wiring or installations in ships, railway rolling equipment, aircraft, or automotive equipment, or 3. Luminaires not installed or maintained under exclusive control by utilities, or 4. Industrial complex or utility interactive systems that are not controlled exclusively under utilities or qualified persons or are located on the premises wiring side of the service point. 10

Scope: Figure 011 -1 11

NESC Committee Members • Edison Electric Institute Members of the Committee are organizations, associations, and government agencies which are national in scope, all having a direct and material interest in the activities of the Committee, for example: • International Brotherhood of Electrical Workers • American Public Power Association • Alliance for Telecommunication Industry Solutions • Solar Energy Industries Association • IEEE • National Association of Regulatory Commissioners • National Cable Television Association • Others 12

Committee Members Continued The NESC consists of: • The NESC Main Committee, • 7 technical Subcommittees, • The Executive Subcommittee, and • An Interpretations Subcommittee Over 150 participants 13

NESC Subcommittees and What They Cover SC 1 - Coordination - Sections 1, 2 and 3; Coordination between technical subcommittees SC 2 - Grounding Methods - Section 9 SC 3 - Electric Supply Stations - Sections 10 -19 SC 4 - Overhead Lines - Clearances - Section 2023 SC 5 - Overhead Lines - Strength and Loading - Sections 24 -27 SC 7 - Underground Lines - Sections 30 -39 SC 8 - Work Rules - Sections 40 -43 14

NESC Parts The NESC is comprised of 5 parts: • Section 9: Rules for Grounding Methods • Part 1. Rules for the Installation and Maintenance of Electric Supply Stations and Equipment • Part 2. Safety Rules for the Installation and Maintenance of Overhead Electric Supply and Communication Lines • Part 3. Safety Rules for the Installation and Maintenance of Underground Electric Supply and Communication Lines • Part 4. Work Rules for the Operation of Electric Supply and Communications Lines and Equipment 15

Part 1: Rules for the Installation and Maintenance of Electric Supply Stations and Equipment Purpose Scope • The purpose of Part 1 is the practical safeguarding of persons during the installation, operation, or maintenance of electric supply stations and their associated equipment. • Part 1 covers the electric supply conductors and equipment, along with the associated structural arrangements in electric supply stations, that are accessible only to qualified personnel. It also covers the conductors and equipment employed primarily for the utilization of electric power when such conductors and equipment are used by the utility in the exercise of its function as a utility. 16

Part 2: Safety Rules for the Installation and Maintenance of Overhead Electric Supply and Communication Lines Purpose Scope • The purpose of Part 2 is the practical safeguarding of persons during the installation, operation, or maintenance of overhead supply and communication lines and their associated equipment. • Part 2 covers supply and communication conductors and equipment in overhead lines. It covers the associated structural arrangements of such systems and the extension of such systems into buildings. The rules include requirements for spacing, clearances, and strength of construction. They do not cover installations in electric supply stations except as required by Rule 162 A. 17

Part 3: Safety Rules for the Installation and Maintenance of Underground Electric Supply and Communication Lines Purpose Scope • The purpose of Part 3 is the practical safeguarding of persons during the installation, operation, or maintenance of underground or buried supply and communication cables and associated equipment. • Part 3 covers supply and communication cables and equipment in underground or buried systems. The rules cover the associated structural arrangements and the extension of such systems into buildings. It also covers the cables and equipment employed primarily for the utilization of electric power when such cables and equipment are used by the utility in the exercise of its function as a utility. They do not cover installations in electric supply stations. 18

Part 4: Work Rules for the Operation of Electric Supply and Communications Lines and Equipment Purpose Scope • The purpose of Part 4 is to provide practical work rules as one of the means of safeguarding employees and the public from injury. It is not the intent of these rules to require unreasonable steps to comply; however, all reasonable steps shall be taken. • Part 4 covers work rules to be followed in the installation, operation, and maintenance of electric supply and communications systems. 19

Grounding Methods Overview • Section 9: Rules for Grounding Methods • Why are power systems grounded? • How does grounding power systems improve safety? • What are safe, effective, and practical methods to ground power systems? 20

Definition Effective Ground/Effectively Grounded: Bonded to an effectively grounded neutral conductor or to a grounding system designed to minimize hazard to personnel and having resistances to ground low enough to permit prompt operation of circuit protective devices. 21

Definition Effectively Grounded Neutral Conductor: A conductor that is intentionally connected to the source transformer neutral directly or through an impedance to limit phase-to-ground fault current and has not less than four grounds in each 1. 6 km (1. 0 mi) of line. The conductor shall be of sufficient size to carry the available fault current and permit prompt operation of circuit protective devices. 22

NESC Rule 96 A Grounding systems shall be designed to minimize hazard to personnel and shall have resistances to ground low enough to permit prompt operation of circuit protective devices. Grounding systems may consist of buried conductors and grounding electrodes. 23

90 Purpose • Practical methods for grounding to protect workers and the public from electrical injury 91 Scope • Not a requirement to ground. Those requirements are found in other Rules outside of Section 9. 24

92 B. Point of Connection Of Grounding Conductor • Alternating Current Systems • 750 V and below § Ground at the neutral if there is a neutral § Ground at source and at line side of all service equipment 25

92 E. Fences • Only applies where other parts of NESC require fences to be grounded • Designed to Limit: § Touch potential § Step potential § Transferred voltages • NOTE: See IEEE Std 80 for guidance 26

92 E. Fences • Ground fence at each side of gate or other opening • Bond gates to grounding conductor, jumper, or fence • Use buried jumper to bond across gate or other fence opening • Bond barbed wire to grounding conductor or fence: • If barbed wire remains tight, OK • Use suitable connections- Care about copper to steel • Ground at fence posts if posts are conductive 27

94. Grounding Electrodes • Two electrode types: • Existing – such as cold water pipes • Made – such as ground rods and other arrangements like buried wire, strips, or plates • Rules recognize different arrangements and materials (just no aluminum) • A qualified engineering study required to have electrodes not specified • Pole butt plates and wire wraps cannot be used for transformer grounds – Only count as ½ electrode 28

96 C. Ground Resistance for Multi-Grounded Systems • No actual resistance value required. • Neutral of sufficient capacity to be connected to a made or existing electrode at: • Each transformer location • And enough other connections to make at least four connections in EACH mile. Do not count grounds at individual services • Rule can be applied to shield wires grounded at the source 29

96 D. Single-Grounded (Unigrounded or Delta) Systems • Individual electrodes should not exceed 25 ohms resistance. If 1 st electrode > 25 ohms, use methods in Rule 094 B 30

97 C. Four Grounds in Each Mile • This means for every way a mile of line can be created in the circuit there must be at least four grounds. • Cannot use the grounds at meter bases (i. e. , customer service equipment) in this number of grounds in each mile. 31

99 C. Additional Grounding and Bonding Requirements for Communication • If communication and supply systems serving the same structure use separate grounding electrodes, bond electrodes with #6 copper or equivalent. • The change from #14 to #6 copper for bonding is to avoid building fires if a neutral becomes disconnected at the structure. 32

Electric, Telephone, and Cable Television Systems are bonded together 33

Maintenance of NESC The NESC is revised every 5 years • Current edition is 2012, published 1 August 2011 • A fixed schedule for revision is published • Next edition will be 2017, published 1 August 2016 34

Revising the National Electrical Safety Code A proposal to revise the NESC may be prepared by any: • Substantially interested person • Interested organization • NESC Subcommittee • Member of the NESC Committee or its subcommittees 35

NESC as Regulation The NESC as written is a voluntary standard Some editions and some parts of the Code have been adopted, with and without changes, by some state and local jurisdictional authorities (currently, 49 states within the U. S. ) To determine the legal status of the NESC in any particular state or locality within a state, the authority having jurisdiction should be contacted 36

NESC Interpretations The NESC has an Interpretations Subcommittee that has sole and exclusive authority to provide official interpretations of the text of any edition of the National Electrical Safety Code • Interpretations do not change Code text • Developed through consensus • Representation on Interpretations Committee from members with expertise in various parts of the Code 37

NESC 2017 Edition § Publication date 1 August 2016 § Effective date: 180 days following publication 38

NESC Handbook § New format: Code rules and Handbook text interspersed § No single author § IEEE is editor § New contributors and peer reviewers for Parts and Sections § Publication date 1 August 2016 39

Acknowledgements • U. S. Trade and Development Agency • American National Standards Institute • National Electrical Manufacturers Association • Institute of Electrical and Electronics Engineers • Eversource Energy • Gulf Power, A Southern Company • Sue Vogel, Senior Manager, National Electrical Safety Code, IEEE Standards Association • John Dagenhart, President of Dagenhart Consulting Services, P. C. , and Chair of NESC Subcommittee 2, Grounding Methods 40

Thank you! For more information, contact: Lauren E. Gaunt Principal Engineer, Eversource Energy lauren. gaunt@eversource. com Mark A. Konz Customer Service Organization Training Supervisor, Gulf Power Company MAKONZ@southernco. com Sue Vogel Senior Manager, NESC & Technical Programs IEEE Standards Association s. vogel@ieee. org 41

Appendix • NESC Summit 2015 • NESC Workshop 18 – 19 October 2016 • Other Items in the Works • Ways to Engage • Pakistan Adaptation of NESC 42

NESC Summit 2015 § An inaugural NESC Summit held in April • Over 100 attendees, stakeholders • A/S Pat Hoffman, U. S. Do. E, Keynote Speaker § Resiliency was a major topic § NESC Visioning Sessions held to address: • The Future of the NESC • Design vs. Safety • The NESC Process § See NESC Summit presentations at: http: //standards. ieee. org/events/nesc-summit. html 43

Outputs from NESC Summit § A White Paper is available that addresses Visioning topics http: //standards. ieee. org/events/nesc/summit_white paper. html § Six NESC videos created at NESC Summit with IEEE. tv • The NESC®: Perspectives on Resiliency • The NESC®: Engaging the Next Generation • The NESC®: Focused on Worker Safety • The NESC®: A Legacy of Safety • The NESC® Summit 2015: Department of Energy Overview: Patricia Hoffman Keynote • The NESC® Summit 2015: OSHA Overview: Dean Mc. Kenzie Keynote http: //www. standardsuniversity. org/videos/ or https: //www. youtube. com/user/IEEESA (search for NESC) 44

Next NESC Event § NESC Workshop 18 -19 October 2016 Grand Hyatt San Antonio, TX § 1. 5 -day event § Registration to be launched May 2016 § All stakeholders welcome to attend San Antonio, TX 45

NESC Workshop Topics to include § 2017 NESC Changes San Antonio, TX October 18 -19 § Kick off the 2022 edition, including issues relevant to addressing the NESC’s future; e. g. , • Solar/Large Scale PV, Wind, Energy Storage • Microgrids • Interconnection • Resiliency • Wind loads • NESC/NEC collaboration § A Subcommittee 5 meeting and workshop is planned for 20 October 2016 in San Antonio—meeting notice to be issued soon 46

Other Items in the Works • New comprehensive NESC website to be launched mid-2016 • NESC Handbook—Spanish translation (Handbook text only) • NESC/NEC White Paper Collaborating with NEC key principals to address gray areas/jurisdiction between two Codes 47

NESC MOOCs (Massive Online Open Course) § Seven MOOCs in development Overview 2017 Changes Grounding Methods Part 1 Part 2 Part 3 Part 4 § NESC members as anchors and contributors § Multi-media 48

NESC Mobile App § NESC’s First App § IT Main Platform has been selected § Equations and Tables under development § Link to Interpretations webpage § Projected Release Date: December 2016 49

Ways to Engage • Attend the NESC Workshop to help drive the future of the NESC • 18 -19 October 2016 • San Antonio, TX • Submit Change Proposals for the 2022 NESC • Submit Comments during the Public Comment Period • New comprehensive NESC website to be launched mid 2016 • Opt-in for regular updates 50

Pakistan Adaption of NESC IEEE-SA approached by Pakistan Engineering Council (PEC) in developing "Pakistan Electric and Telecom Safety Code (PETSAC)” in 2014 – Statutory and accreditation body for engineers – PEC worked with USAid-PDP, The US Agency for International Development, Power Distribution Program, to develop a draft document – Not a straightforward adoption, but an adaption (local conditions, telecom section, etc. ) IEEE granted a royalty-free license to PEC – Strongly aligns with IEEE’s mission “for the benefit of humanity” IEEE-SA and PEC issued a joint press release 11/10/15 – “The Government of Pakistan on 30 July 2015 notified PETSAC-2014 for implementation by electrical power and telecommunication utilities, both private and public, across Pakistan, and the code is to be made fully effective within six months. The Pakistan Engineering Council plans to arrange workshops and seminars across the country for mass dissemination and publicity of PETSAC 2014, which was created with financial assistance from the United States Agency for International Development (USAID)-Power Distribution Program, Pakistan. “ 51

PEC comments “On behalf of Pakistan Engineering Council and USAID-PDP, we are really grateful for your kind consideration and encouragement for our efforts to safeguard the workforce and general public from the accidents/ electrocuting incidents in the electric and telecom sectors in Pakistan. ” “It is the first national level initiative in our country and would be a great service for our people. ” ”…the subject document [PETSAC]…is a dire need for the people of Pakistan…” PEC is pleased to announce Launching of Pakistan Electric and Telecommunication Safety Code (PETSAC-2014) on 14 December, 2015, 1000 hours at Marriott Hotel, Islamabad, Pakistan. 52