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Description / Abstract:
The guide is based on industry practices and presents guidelines
for installation, maintenance, and operation of irrigation
equipment near or under power lines as they pertain to minimum
distance to energized conductors and proper grounding to minimize
nuisance shocks. The guide covers a variety of conditions in
general terms. Specific recommendations are made for the type of
irrigation systems and power line parameters most commonly
found.
Purpose
The guide is intended for designers, installers, and operators
of the irrigation equipment, as well as electric power utilities
whose lines are located near or above the irrigation systems.
General information is provided on installation, maintenance, and
operation of irrigation equipment as it relates to safety due to
the presence of electric power lines. The following parameters are
considered:
a) Distance to energized conductors during installation
b) Proper grounding to minimize nuisance shocks
c) Distance between irrigation nozzle and power line conductors
during operation of the irrigation system
The recommended minimum conductor-to-nozzle distance is based on
the maximum allowable body leakage current of 5 mA rms and field
tests conducted by the Nebraska Public Power District and the USDA
Agricultural Research Service, University of Nebraska.
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
parameters that are most representative in the industry. The IEEE
makes no representation or warranty as to the adequacy or accuracy
of the information in this guide or as to economy, or safety issues
associated with the use of this guide. When determining whether or
not, and/or how, to use the information in this guide, all factors
shall be considered with regard to the specific situation(s).
This material is intended to provide a helpful reference for
those seeking information on common industry practices so they may
consider the experience of others in developing or modifying their
own practices.