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ASTM G165-99(2017)

(Practice)

Standard Practice for Determining Rail-to-Earth Resistance

Standard Practice for Determining Rail-to-Earth Resistance

SIGNIFICANCE AND USE
4.1 Low resistance between the rails and earth could result in large magnitudes of stray earth currents with the attendant corrosion damage to underground metallic structures.  
4.2 These measurements are of a low voltage type and are not designed to evaluate the high voltage dielectric characteristics of the rail insulating elements.  
4.3 Sections of track with rail-to-earth resistances less than acceptable minimums must be tested in greater detail to determine the reason(s) for this condition. Determination of the reason(s) for any low rail-to-earth resistance may require the use of special testing techniques or special instruments, or both, beyond the scope of this practice.  
4.4 The electrical tests call for the use of electric meters that have varying characteristics depending on cost, manufacture, and generic type. It is assumed that any person employing the test procedures contained herein will know how to determine and apply proper correction factors and that they will have sufficient knowledge to ensure reasonable accuracy in the data obtained.  
4.5 This practice does not encompass all possible field conditions to obtain rail-to-earth resistance characteristics. No general set of test procedures will be applicable to all situations.
SCOPE
1.1 This practice covers the procedures necessary to follow for measuring resistance-to-earth of the running rails which are used as the conductors for returning the train operating current to the substation in electric mass transit systems.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 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.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
30-Apr-2017
ICS
45.120 - Equipment for railway/cableway construction and maintenance
Technical Committee
G01 - Corrosion of Metals
Drafting Committee
G01.10 - Corrosion in Soils
Current Stage
Ref Project

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ASTM G165-99(2017) - Standard Practice for Determining Rail-to-Earth Resistance
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G165 − 99 (Reapproved 2017)
Standard Practice for
1
Determining Rail-to-Earth Resistance
This standard is issued under the fixed designation G165; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.3 impedance bond—a device connected to running rails
for automatic train operations.
1.1 This practice covers the procedures necessary to follow
for measuring resistance-to-earth of the running rails which are 3.1.4 The terminology used herein, if not specifically de-
used as the conductors for returning the train operating current fined otherwise, shall be in accordance with Terminology G15.
to the substation in electric mass transit systems. Definitions provided herein, and not given in Terminology
G15, are limited to this practice.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Significance and Use
only.
4.1 Low resistance between the rails and earth could result
1.3 This standard does not purport to address all of the
in large magnitudes of stray earth currents with the attendant
safety concerns, if any, associated with its use. It is the
corrosion damage to underground metallic structures.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4.2 These measurements are of a low voltage type and are
bility of regulatory limitations prior to use. not designed to evaluate the high voltage dielectric character-
1.4 This international standard was developed in accor- istics of the rail insulating elements.
dance with internationally recognized principles on standard-
4.3 Sections of track with rail-to-earth resistances less than
ization established in the Decision on Principles for the
acceptable minimums must be tested in greater detail to
Development of International Standards, Guides and Recom-
determinethereason(s)forthiscondition.Determinationofthe
mendations issued by the World Trade Organization Technical
reason(s) for any low rail-to-earth resistance may require the
Barriers to Trade (TBT) Committee.
use of special testing techniques or special instruments, or
both, beyond the scope of this practice.
2. Referenced Documents
2
4.4 The electrical tests call for the use of electric meters that
2.1 ASTM Standards:
have varying characteristics depending on cost, manufacture,
G15 Terminology Relating to Corrosion and Corrosion Test-
3
and generic type. It is assumed that any person employing the
ing (Withdrawn 2010)
test procedures contained herein will know how to determine
3. Terminology and apply proper correction factors and that they will have
sufficient knowledge to ensure reasonable accuracy in the data
3.1 Definitions of Terms Specific to This Standard:
obtained.
3.1.1 cross bond—insulated copper cables that connected
4.5 This practice does not encompass all possible field
between adjacent sections of track to ensure electrical conti-
nuity between them. conditions to obtain rail-to-earth resistance characteristics. No
general set of test procedures will be applicable to all situa-
3.1.2 direct fixation fastener—adeviceforfasteningrunning
tions.
rails to their support structures.
5. Equipment
1
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
5.1 Indicating dc; high impedance (minimum ten megohm)
of Metals and is the direct responsibility of Subcommittee G01.10 on Corrosion in
Soils.
voltmeter (two required); multi-scale, capable of reading posi-
Current edition approved May 1, 2017. Published May 2017. Originally
tive and negative values without removing test leads; and
approved in 1999. Last previous edition approved in 2012 as G165 – 99 (2012).
covering at least the following full scale ranges:
DOI: 10.1520/G0165-99R17.
2
5.1.1 0 to 10 mV,
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
5.1.2 0 to 100 mV,
Standards volume information, refer to the standard’s Document Summary page on
5.1.3 0 to 1 V,
the ASTM website.
3
5.1.4 0 to 10 V, and
The last approved version of this historical standard is referenced on
www.astm.org. 5.1.5 0 to 100 V.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G165 − 99 (2017)
5.1.6 Meters shall be ac
...

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Note 1: If the service environment in which the material is to be used is considered conducive to stress-corrosion cracking, precipitation hardening should be performed at a temperature that will minimize the susceptibility of the material to this type of attack.  
1.4 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. The supplementary requirements shall apply only when specified individually by the purchaser in the purchase order or contract.  
1.5 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M-specification designation (SI units), the inch-pound units shall apply.  
1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. Within the text, the SI units are shown in brackets.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Technical specification
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    English language
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  • Technical specification
    4 pages
    English language
    sale 15% off