The U.S. National Electrical Code (NEC) Article 694 2014 Edition Dr. Robert Wills, P.E. Robert Preus, P.E. Representing AWEA & YOU The U.S. National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the United States. The NEC, while having no legally binding regulation as written, can be and often is adopted by states, municipalities and cities in an effort to standardize their enforcement of safe electrical practices within their respective jurisdiction. In some cases, the NEC is amended, altered and may even be rejected in lieu of regional regulations as voted on by the governing bodies of any given locale. From Wikipedia The U.S. National Electrical Code (NEC) The NEC is developed by the National Fire Protection Association’s (NFPA) Committee on the National Electrical Code, which consists of 19 code-making panels and a technical correlating committee. The NEC is an American National Standard (ANSI/NFPA 70). From Wikipedia $90 Paper or PDF $150 Paper or PDF Article 694 Wind Electric Systems Other Standards AWEA9.1 IEEE1547 UL1741 UL6171 UL6142 IEC 61400-2 New: Safety for Wind Turbine Generating Systems – Small, UL 6142 Safety for Wind Turbine Converters and Interconnection Systems Equipment, UL 6171 What We Do… Engineering Olympics.. (600 Proposals, 5 days Robert’s Rules) Holding back the floodwaters (avoid the complexity of 690) Thank you NREL for Support! 694.1 Scope – Small AND Large • The provisions of this article apply to small wind (turbine) electric systems that consist of one or more wind electric generators with individual generators having a rated power up to and including 100 kW. These systems can include generators, alternators, inverters, and controllers. 694.1 Scope – Implications • Large wind is subject to local electrical inspection • We will see involvement from large manufacturers Equipment Listing 694.7(B) Equipment Wind electric systems equipment, subassemblies and components shall be identified and listed for the application. [Not only inverters – turbines & controllers MUST be listed starting in 2014!] Turbine Shutdown 694.23 Turbine Shutdown. (A) Manual Shutdown. Wind turbines shall be required to have a manual shutdown button or switch. Operation of the button or switch shall result in a parked turbine state which shall either stop the turbine rotor, or allow limited rotor speed combined with a means to de-energize the turbine output circuit. Exception: Turbines with a swept area of less than 50 m2 shall not be required to have a manual shutdown button or switch. (B) Shutdown Procedure. The shutdown procedure for a wind turbine shall be defined and permanently posted at the location of a shutdown means, and at the location of the turbine controller or disconnect, if different. Tower as Raceway 694.7(F) Metal or Nonmetallic Poles or Towers Supporting Wind Turbines Used as a Raceway. A metallic or nonmetallic pole or tower shall be permitted to be used as a raceway if evaluated as part of the listing for the wind turbine, or otherwise listed or evaluated for the purpose. 1000V Allowed for NonResidential Installations 694.10(A) Wind Turbine Output Circuits. For wind turbines connected to one- and two-family dwellings, turbine output circuits shall be permitted to have a maximum voltage up to 600 volts. Other installations with a maximum voltage over 1000 volts shall comply with Part IX of Article 694. Grounding 694.40 Proposal clarifies that wind turbine generators should use supply-side bonding jumper requirements rather than equipment grounding conductors between the turbine generator and first disconnect, or turbine power conversion equipment, identifies the requirements for dc systems, and also clarifies that the turbine output circuit may be grounded but is not required to be grounded.. The reference to 250.35 covers both separately derived and non-separately derived systems. What’s Next.. The 2017 NEC Proposals Due Nov 7, 2014 Rob Wills (603) 801-4749 rwills @ forengics.com Thank you NREL for Support! The Terawatt Challenge Richard Smalley’s Top Ten Global Problems 1. Energy 2. Water 3. Food 4. Environment 5. Poverty 6. Terrorism and war 7. Disease 8. Education 9. Democracy 10. Population In 2004, we consumed on average the equivalent of 220 million barrels of oil per day to run the world. Or, if we convert that into watts, what ran the world was about 14.5 terawatts. The vast majority of this energy was from oil, gas, and coal.