This guide provides recommendations for in-service inspection,
maintenance, and electrical testing of liveline tools. It is not
intended to include all of the proven practical methods and
procedures. However, these selected comprehensive recommendations
are based on sound engineering principles, engineering safety
considerations and decades of testing, and Þeld experience by many
Only the electrical aspects are discussed, namely ac, dc,
high-potential test, and Watts-Loss procedures. All electrical
values throughout this guide, unless otherwise stated, are 50 Hz Ð
60 Hz rms values. Equivalent dc values as established by the user
may be substituted.
Two main areas of this guide are inspection and testing: Section
4Ñat the job site, and Section 5Ñin the shop laboratory. Therefore,
procedures are outlined from the very basic areas to the more
To present in one document sufÞcient details of presently used
methods and equipment to enable the in-service inspection,
electrical testing, and maintenance of live-line tools.
To direct attention to appropriate standards or other documents
relating to the care and testing of tools.
It is not intended that this guide should replace present proven
utility standards or imply that these recommendations are superior
to existing practices and, therefore, should be universally adopted
as utility standards. This compilation of many accepted practices
is presented speciÞcally in the form of a guide to be used by those
utilities that are seeking guidance in establishing methods and
procedures for maintenance and electrical testing of live-line
This guide is not intended nor should it be considered as
establishing a standard for maintenance and electrical testing of
live-line tools in the electric utility industry.
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