These specifications cover the equipment making up the temporary
grounding system used on de-energized electric power lines,
electric supply stations, and equipment.
It is common practice for the users of protective grounding
equipment to prepare complete instructions and regulations to
govern in detail the correct use and maintenance of such
The uses and maintenance of this equipment are beyond the scope
of these specifications.
Each of the four parts is an entity of itself, but is listed as
a part of the system for completeness and clarification.
Currents presented in Table 1 are based upon cable melting
times, as determined from equations by I. M. Onderdonk and are to
used in situations involving an asymmetry value less than 20 %
(X/R≤ 1.8). See Appendix X3.
Currents presented in Table 2 are based upon the values from
EPRI Project RP2446 Computer Program RTGC "A Desktop Computer
Program for Calculating Rating of Temporary Grounding Cables" and
are to be used in situations involving an asymmetry value greater
then 20 % (X/R>1.8), see Appendix X4.
NOTE 1—Table 1 represents the clamp and assembly ratings that
existed prior to this revision. Table 2 represents new ratings now
required for high X/R situations.
See Appendix X3 and Appendix X4 for a discussion of these
The values stated in Newton-Meter units are to be regarded as
the standard. The values in parentheses are the inch-pound
The following precautionary caveat pertains to the test method
portions, Sections 12 and 25 of these specifications: This
standard does not purport to address all of the safety concerns, if
any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limitations
prior to use.
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