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Article 395 Outdoor Overhead Conductors over 1000 Volts 395.1 Scope. This article covers the use and installation for outdoor overhead conductors over 1000 volts, nominal. ENHANCED CONTENT Collapse This article is performance based. It provides the objectives for compliance, rather than prescriptive...

Article 395 Outdoor Overhead Conductors over 1000 Volts 395.1 Scope. This article covers the use and installation for outdoor overhead conductors over 1000 volts, nominal. ENHANCED CONTENT Collapse This article is performance based. It provides the objectives for compliance, rather than prescriptive requirements. These objectives can be met through existing consensus standards for installation of overhead conductors, such as ANSI/IEEE C2, National Electrical Safety Code (NESC). Definitions. The following term has a definition in Article 100 that is unique to its use in Article 395: Outdoor overhead conductors 395.10 Uses Permitted. Outdoor overhead conductors over 1000 volts, nominal, shall be permitted only for systems rated over 1000 volts, nominal, as follows: (1) Outdoors in free air For service conductors, feeders, or branch circuits Informational Note: See IEEE C2, National Electrical Safety Code, and ANSI/IEEE 3001.2, Recommended Practice for Evaluating the Electrical Service Requirements of Industrial and Commercial Power Systems, for additional information on outdoor overhead conductors over 1000 volts. 395.30 Support. (A) Conductors. Documentation of the engineered design by a licensed professional engineer engaged primarily in the design of such systems for the spacing between conductors shall be available upon request of the authority having jurisdiction and shall include consideration of the following: (1) Applied voltage Conductor size Distance between support structures Type of structure Wind/ice loading Surge protection Structures. Structures of wood, metal, or concrete, or combinations of those materials, shall be provided for support of overhead conductors over 1000 volts, nominal. Documentation of the engineered design by a licensed professional engineer engaged primarily in the design of such systems and the installation of each support structure shall be available upon request of the authority having jurisdiction and shall include consideration of the following: Soil conditions Foundations and structure settings Weight of all supported conductors and equipment Weather loading and other conditions such as, but not limited to, ice, wind, temperature, and lightning Angle where change of direction occurs Spans between adjacent structures Effect of dead-end structures Strength of guy wires and guy anchors Structure size and material(s) Hardware Insulators. Insulators used to support conductors shall be rated for all of the following: Applied phase-to-phase voltage Mechanical strength required for each individual installation Impulse withstand BIL in accordance with Table 495.24 Informational Note: See 395.30(A), (B), and (C), which are not all-inclusive lists.