IEEE Std 1542 pdf download IEEE Guide for Installation, Maintenance, and Operation of Irrigation Equipment Located Near or Under Power Lines
The guide is based on industry practices and presents guidelines for installation, maintenance, and operationof above ground irigation equipment near or under power lines as they pertain to minimum distance toenergized conductors and proper grounding to help minimize nuisance shocks. The guide covers a variety ofconditions in general terms. Specific recommendations are made for the type of irigation systems and powerline parameters most commonly found.This guide does not cover transferred potentials and currents.
The guide is intended for designers, installers, and operators of the irrigation equipment, as well as electricpower utilities whose lines are located near or above the irrigation systems. General information is providedon installation, maintenance, and operation of irrigation equipment as it relates to safety due to the presence ofelectric power lines.The following parameters are considered:
a) Distance to energized conductors during installationb)Proper grounding to help minimize nuisance shocks
c)Distance between irrigation nozzle and power line conductors during operation of the irrigation
The recommended minimum conductor-to-nozzle distance is based on the maximum allowable bodyleakage current of 5 mA rms and field tests conducted by the Nebraska Public Power District and the USDAAgricultural Research Service,University of Nebraska [B3]1.
Because of the great variety of conditions, practices, electrical system designs, types of irrigation systems,water conductivity, and ground-resistance values, this guide covers these variables only in general terms.However, specific recommendations are made for the type of irrigation system and power line parametersthat are most representative in the industry.The IEEE makes no representation or warranty as to the adequacyor accuracy of the information in this guide or as to economy, or safety issues associated with the use of thisguide. When determining whether or not, and/or how, to use the information in this guide, all factors shall beconsidered with regard to the specific situation(s).
This material is intended to provide a helpful reference for those seeking information on commonindustry practices so they may consider the experience of others in developing or modifying theirown practices.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they mustbe understood and used, so each referenced document is cited in text and its relationship to this document isexplained).For dated references, only the edition cited applies.For undated references, the latest edition of thereferenced document (including any amendments or corrigenda) applies.
Accredited Standards Committee C2, National Electrical Safety CodeR(NESCR),2
For the purposes of this document, the following terms and definitions apply.The IEEE Standards DictionaryOnline should be consulted for terms not defined in this clause.3
ground resistance:The resistance of the irrigation system to earth, determined by a groundingelectrode or by the contact of the irrigation equipment with the earth, or both.
irrigation equipment: Structures, pipes, nozzles,valves,etc., that support, convey, direct, and/orcontrol water or other equipment in an irrigation system.
irrigation system:An arrangement of equipment including a water supply that is assembled tosystematically apply irrigation to an area.
nuisance shock:An electric shock from a steady-state or a discharge current for which a personwould consider the sensation to be a mild irritant if it were to occur repeatedly.Syn: annoyanceshock, secondary shock
reference heights:Assumed height above ground of a metal object (i.e.,sprinkler height).
water spray: water broken up into minute droplets.
water stream: electrically continuous column of water.
This guide presents a reference source for the operation of irrigation systems located near or under electricpower lines to reduce safety risks. The distances between the power line conductors and water spray nozzlesthat are given in this guide are based on commonly used body resistance values and other parameters thatare representative of typical conditions and methods. For conditions where the values of parameters such aswater resistivity, system ground resistance, and/or body resistance differ from those used here, the value ofthe power-line-conductor-to-nozzle distance can be determined using the equations and plots provided in thisguide.