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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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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:
|Clamps for Temporary Protective Grounds||4-16|
|Ferrules for Temporary Protective Grounds||17-30|
|Cables for Temporary Protective Grounds||31-39|
|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 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.
1.6.1 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.
1.6.2 See Appendix X3 and Appendix X4 for a discussion of these topics.
1.7 The values stated in Newton-Meter units are to be regarded as the standard. The values in parentheses are the inch-pound units.
1.8 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B172 Specification for Rope-Lay-Stranded Copper Conductors Having Bunch-Stranded Members, for Electrical Conductors
B173 Specification for Rope-Lay-Stranded Copper Conductors Having Concentric-Stranded Members, for Electrical Conductors
D470 Test Methods for Crosslinked Insulations and Jackets for Wire and Cable
D2219 Specification for Poly(Vinyl Chloride) Insulation for Wire and Cable, 60C Operation
D2633 Test Methods for Thermoplastic Insulations and Jackets for Wire and Cable
D2768 Specification for General-Purpose Ethylene-Propylene Rubber Jacket for Wire and Cable
D2770 Specification for Ozone-Resisting Ethylene-Propylene Rubber Integral Insulation and Jacket for Wire and Cable
E8/E8M Test Methods for Tension Testing of Metallic Materials
ANSI StandardC37.09 Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Basis
ICEA/NEMA StandardICEAS-19-81/NEMAWC3- Rubber Insulated Wire and Cable for the Transmission and Distribution of Electrical Energy
IEC StandardIEC61230 Ed. 2, 2008, Portable Equipment for Earthing or Earthing and Short-Circuiting
IEEE StandardIEEE1246 Guide for Temporary Protective Grounding Systems Used in Substations
UNSPSC Code 60104917(Electric equipotential apparatus)