ASTM F712-06(2011)
(Test Method)Standard Test Methods and Specifications for Electrically Insulating Plastic Guard Equipment for Protection of Workers
Standard Test Methods and Specifications for Electrically Insulating Plastic Guard Equipment for Protection of Workers
SIGNIFICANCE AND USE
All three tests may be used for product design qualification.
This specification covers the minimum electrical, chemical, and physical properties designated by the manufacturer and the detailed procedures by which such properties are to be determined. The purchaser has the option to perform or have performed any of these tests and may reject equipment that fails to meet the standard criteria. Claims concerning failure to meet the specification are subject to verification by the manufacturer.
Plastic guard equipment is used for protection against accidental brush contact by the worker. A margin of safety shall be provided between the maximum voltage at which they are used and the proof-test voltage at which they are tested. This relationship is shown in Table 1 and Table 2. The equipment is designed only for phase-to-ground or covered phase-to-covered-phase exposure.
Note 1—Rubber insulating equipment is realistically limited to Class 4 material in the design specification standards. Plastic guard equipment has been designed to go beyond these voltages and provide a satisfactory degree of worker protection. Major differences exist in use criteria between the rubber and the plastic guard equipment. Each glove, sleeve, or other article of rubber insulating equipment has a given safety factor for the phase to phase voltage on which it may be used and the class or proof voltage at which it is tested. Plastic guard equipment, however, is designed to provide a satisfactory safety factor only when used in a phase-to-ground exposure. If exposure is phase-to-phase, then a satisfactory safety factor is only provided if the exposure is covered-phase-to-covered-phase.
Work practices vary from user to user, dependent upon many factors. These may include, but are not limited to, operating system voltages, construction design, work procedure techniques, weather conditions, etc. Therefore, except for the restrictions set forth in this specification because of design limita...
SCOPE
1.1 These test methods cover three electrical tests on plastic guards and assembled guard systems. They are:
1.1.1 Method A—Withstand voltage proof test,
1.1.2 Method B—Flashover voltage, and
1.1.3 Method C—Leakage current.
1.1.4 This specification covers plastic guard equipment and guard systems used by workers for temporary insulation on electric power circuits.
1.1.5 Plastic guard equipment covered by this specification is rated for momentary, or brush contact only. Maximum-use voltages are covered in Table 1 and Table 2.
1.2 These test methods cover, but are not limited to, the following typical guards:
1.2.1 Conductor Guards and Connecting Covers as follows:
1.2.1.1 Line guards,
1.2.1.2 Line guard connectors,
1.2.1.3 Insulator covers,
1.2.1.4 Dead-end covers,
1.2.1.5 Bus guards, and
1.2.1.6 Bus “T” guards.
1.2.2 Structure and Apparatus Covers as follows:
1.2.2.1 Pole guards,
1.2.2.2 Ridge pin covers,
1.2.2.3 Switch blade covers,
1.2.2.4 Arm guards,
1.2.2.5 Cutout covers,
1.2.2.6 Structural barriers, and
1.2.2.7 Cross arm guard.
1.3 It is common practice for the user of this equipment to prepare instructions for the correct use and maintenance.
1.4 The use and maintenance of this equipment is beyond the scope of these test methods.
1.5 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.
1.6 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F712 −06 (Reapproved 2011)
Standard Test Methods and Specifications for
Electrically Insulating Plastic Guard Equipment for
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Protection of Workers
ThisstandardisissuedunderthefixeddesignationF712;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
1.1 Thesetestmethodscoverthreeelectricaltestsonplastic
bility of regulatory limitations prior to use.
guards and assembled guard systems. They are:
1.6 Thevaluesstatedininch-poundunitsaretoberegarded
1.1.1 Method A—Withstand voltage proof test,
as standard. The values given in parentheses are mathematical
1.1.2 Method B—Flashover voltage, and
conversions to SI units that are provided for information only
1.1.3 Method C—Leakage current.
and are not considered standard.
1.1.4 This specification covers plastic guard equipment and
guard systems used by workers for temporary insulation on
2. Referenced Documents
electric power circuits.
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1.1.5 Plastic guard equipment covered by this specification 2.1 ASTM Standards:
is rated for momentary, or brush contact only. Maximum-use D149Test Method for Dielectric Breakdown Voltage and
voltages are covered in Table 1 and Table 2. DielectricStrengthofSolidElectricalInsulatingMaterials
at Commercial Power Frequencies
1.2 These test methods cover, but are not limited to, the
D256Test Methods for Determining the Izod Pendulum
following typical guards:
Impact Resistance of Plastics
1.2.1 Conductor Guards and Connecting Covers as follows:
D570Test Method for Water Absorption of Plastics
1.2.1.1 Line guards,
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2.2 IEEE Standard:
1.2.1.2 Line guard connectors,
1.2.1.3 Insulator covers, IEEE 978Guide for In-Service Maintenance and Electrical
Testing for Live-Line Tools
1.2.1.4 Dead-end covers,
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1.2.1.5 Bus guards, and
2.3 ANSI Standard:
1.2.1.6 Bus “T” guards.
C39.5Safety Requirements for Electrical and Electronic
1.2.2 Structure and Apparatus Covers as follows:
Measuring and Controlling Instrumentation
1.2.2.1 Pole guards,
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2.4 UL Standard:
1.2.2.2 Ridge pin covers,
94Tests for Flammability of Plastic Materials for Parts in
1.2.2.3 Switch blade covers,
Devices and Appliances
1.2.2.4 Arm guards,
1.2.2.5 Cutout covers,
3. Terminology
1.2.2.6 Structural barriers, and
3.1 Definitions of Terms Specific to This Standard:
1.2.2.7 Cross arm guard.
3.1.1 insulating plastic guards—devices for temporary in-
1.3 It is common practice for the user of this equipment to
stallation on structures or energized electric power circuits for
prepare instructions for the correct use and maintenance.
electrical protection of personnel or equipment, or both.
1.4 The use and maintenance of this equipment is beyond
the scope of these test methods.
1.5 This standard does not purport to address all of the 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
safety concerns, if any, associated with its use. It is the 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
the ASTM website.
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These test methods are under the jurisdiction of ASTM Committee F18 on Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE),
Electrical Protective Equipment for Workers and are the direct responsibility of 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http://www.ieee.org.
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Subcommittee F18.25 on Insulating Cover-Up Equipment. Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved Nov. 15, 2011. Published November 2011. Originally 4th Floor, New York, NY 10036, http://www.ansi.org.
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approved in 1981. Last previous edition approved in 2006 as F712–06. DOI: Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,
10.1520/F0712-06R11. Northbrook, IL 60062-2096, http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F712−06 (2011)
A
TABLE 1 Withstand Voltage Proof Test voltageatwhichitistested.Plasticguardequipment,however,isdesigned
toprovideasatisfactorysafetyfactoronlywhenusedinaphase-to-ground
Class Rating, Max Use Proof Test Withstand Voltage
exposure.Ifexposureisphase-to-phase,thenasatisfactorysafetyfactoris
kV 60 Hz (in-service testing)
Criteria
only provided if the exposure is covered-phase-to-covered-phase.
Duration,
A
0-0 0-Ground 0-Ground kV
min
4.4 Work practices vary from user to user, dependent upon
60 Hz DC
...
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