ASTM F855-04
(Specification)Standard Specifications for Temporary Protective Grounds to Be Used on De-energized Electric Power Lines and Equipment
Standard Specifications for Temporary Protective Grounds to Be Used on De-energized Electric Power Lines and Equipment
ABSTRACT
These specifications cover the equipment making up the temporary grounding system used on de-energized electric power lines, electric supply stations, and equipment. These specifications for a system of protective grounding utilizing copper cables are covered in four parts, as follows: clamps, ferrules, cables, and temporary protective grounds. Each of the four parts is an entity of itself, but is listed as a part of the system for completeness and clarification. The clamps shall be subject to design tests for determining mechanical torque strength and electrical short circuit capacity. The ferrules shall be tested for electrical short-circuit capacity and continuous current rating. The elastomer or thermoplastic making up the jacket of the flexible cable shall be tested according to the specified methods.
SCOPE
1.1 These specifications cover the equipment making up the temporary grounding system used on de-energized electric power lines, electric supply stations, and equipment.
1.2 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 equipment.
1.3 The uses and maintenance of this equipment are beyond the scope of these specifications.
1.4 These specifications for a system of protective grounding utilizing copper cables are covered in four parts, as follows:SectionsClamps for Temporary Protective Grounds4-16 Ferrules for Temporary Protective Grounds17-30 Cables for Temporary Protective Grounds31-39 Protective Grounds (Complete Assembly With Clamps, Ferrules, and Cable)40-52
1.5 Each of the four parts is an entity of itself, but is listed as a part of the system for completeness and clarification.
1.6 The values stated in Newton-Meter units are to be regarded as the standard. The values in parentheses are the inch-pound units.
1.7 Currents presented in Table 1 and Table 2 are based upon cable melting times, as determined from equations by I. M. Onderdonk. See Appendix X3.
1.7.1 Currents presented in were determined by use of EPRI Project RP2446 Computer Program RTGC "A Desktop Computer Program for Calculating Rating of Temporary Grounding Cables."
1.7.2 See Appendix X3 and Appendix X4 for a discussion of these values.
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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Designation: F 855 – 04
Standard Specifications for
Temporary Protective Grounds to Be Used on De-energized
1
Electric Power Lines and Equipment
This standard is issued under the fixed designation F 855; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope health practices and determine the applicability of regulatory
limitations prior to use.
1.1 Thesespecificationscovertheequipmentmakingupthe
temporary grounding system used on de-energized electric
2. Referenced Documents
power lines, electric supply stations, and equipment.
2
2.1 ASTM Standards:
1.2 It is common practice for the users of protective
B172 Specification for Rope-Lay-Stranded Copper Con-
grounding equipment to prepare complete instructions and
ductors Having Bunch-Stranded Members, for Electrical
regulations to govern in detail the correct use and maintenance
Conductors
of such equipment.
B173 Specification for Rope-Lay-Stranded Copper Con-
1.3 Theusesandmaintenanceofthisequipmentarebeyond
ductors Having Concentric-Stranded Members, for Elec-
the scope of these specifications.
trical Conductors
1.4 These specifications for a system of protective ground-
B263 Test Method for Determination of Cross-Sectional
ingutilizingcoppercablesarecoveredinfourparts,asfollows:
Area of Stranded Conductors
D470 Test Methods for Cross-linked Insulations and Jack-
Sections
Clamps for Temporary Protective Grounds 4-16
ets for Wire and Cable
Ferrules for Temporary Protective Grounds 17-30
D753 Specification for General-Purpose Polychloroprene
Cables for Temporary Protective Grounds 31-39
Jacket for Wire and Cable
Protective Grounds (Complete Assembly With Clamps, Ferrules, 40-52
and Cable)
D2219 Specification for Poly(Vinyl Chloride) Insulation
for Wire and Cable, 60 Operation
1.5 Each of the four parts is an entity of itself, but is listed
D2633 Methods of Testing Thermoplastic Insulations and
as a part of the system for completeness and clarification.
Jackets for Wire and Cable
1.6 The values stated in Newton-Meter units are to be
D2768 Specification for General-Purpose Ethylene Propy-
regarded as the standard. The values in parentheses are the
lene Rubber Jacket for Wire and Cable
inch-pound units.
D2770 Specification for Ozone-Resisting Ethylene Propy-
1.7 Currents presented in Table 1 and Table 2 are based
lene Rubber Integral Insulation and Jacket for Wire and
upon cable melting times, as determined from equations by I.
Cable
M. Onderdonk. See Appendix X3.
E8 Test Methods of Tension Testing of Metallic Materials
1.7.1 Currents presented in Table 3 were determined by use
2.2 ANSI Standard:
of EPRI Project RP2446 Computer Program RTGC “A Desk-
C 37.09 Standard Test Procedure for AC High-Voltage
top Computer Program for Calculating Rating of Temporary
3
Circuit Breakers Rated on a Symmetrical Basis
Grounding Cables.”
2.3 ICEA/NEMA Standard:
1.7.2 SeeAppendixX3andAppendixX4foradiscussionof
ICEA S-19-81/NEMA WC 80 (R1986) Rubber Insulated
these values.
Wire and Cable for the Transmission and Distribution of
1.8 The following precautionary caveat pertains to the test
4
Electrical Energy
method portions, Sections 12 and 25 of these specifications:
2.4 IEC Standard:
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
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
1
These specifications are under the jurisdiction of ASTM Committee F18 on the ASTM website.
3
Electrical Protective Equipment for Workers and are the direct responsibility of Available fromAmerican National Standards Institute, 11 West 42nd St., 13th
Subcommittee F18.45 on Mechanical Apparatus. Floor, New York, NY 10036.
4
Current edition approved Sept. 1, 2004. Published September 2004. Originally AvailablefromInsulatedCableEngineersAssoc.,P.O.BoxP,SouthYarmouth,
approved in 1983. Last previous edition approved in 2003 as F855–03. MA 02664.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F 855–04
TABLE 1 Protective Ground Clamp Ratings
Grounding Clamp Torque
A
Short Circuit Properties
Strength, min
Minimum Ca-
CD
Withstand Rating, Symmetrical Ultimate Rating/Capacity, Symmetrical Continuous
ble Size with
B
Yield Ultimate kA kA Current
Ferrule In-
Grade RMS, 60 Hz
...
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