ASTM F968-93(2002)e1
(Specification)Standard Specification for Electrically Insulating Plastic Guard Equipment for Protection of Workers (Withdrawn 2008)
Standard Specification for Electrically Insulating Plastic Guard Equipment for Protection of Workers (Withdrawn 2008)
ABSTRACT
This specification covers electrically insulating plastic guard equipment and guard systems for temporary insulation on electric power circuits. Typical plastic guard equipments include, but are not limited to, line guards, line guard connectors, insulator covers, dead end covers, bus guards, bus “T” guards, pole guards, ridge pin covers, switch-blade covers, arm guards, cutout covers, and cross arm guard. Materials for guards shall conform to the specified impact strength, water absorption, dielectric strength, flame retardancy, dimensions, workmanship, finish, appearance, marking, and packaging.
SCOPE
1.1 This specification covers plastic guard equipment and guard systems used by workers for temporary insulation on electric power circuits.
1.2 Plastic guard equipment covered by this specification is rated for momentary, or brush contact only. Maximum-use voltages are covered in Annex A1.
1.3 Typical guards covered include, but are not limited to, the following:
1.3.1 Conductor guards and connecting covers as follows:
1.3.1.1 Line guards,
1.3.1.2 Line guard connectors,
1.3.1.3 Insulator covers,
1.3.1.4 Dead end covers,
1.3.1.5 Bus guards, and
1.3.1.6 Bus "T" guards.
1.3.2 Structure and apparatus covers as follows:
1.3.2.1 Pole guards,
1.3.2.2 Ridge pin covers,
1.3.2.3 Switch-blade covers,
1.3.2.4 Arm guards,
1.3.2.5 Cutout covers, and
1.3.2.6 Cross arm guard.
1.4 The values stated in inch-pound units are to be regarded as the standard.
WITHDRAWN RATIONALE
This specification covers plastic guard equipment and guard systems used by workers for temporary insulation on electric power circuits.
Formerly under the jurisdiction of ASTM Committee F18 on Electrical Protective Equipment for Workers and Subcommittee F18.25 on Insulating Cover-up Equipment, this specification was withdrawn in October 2008 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date. Additionally, the standard was rolled into the latest revision of F 712 and the committee believes that this standard is no longer necessary.
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
e1
Designation: F 968 – 93 (Reapproved 2002)
Standard Specification for
Electrically Insulating Plastic Guard Equipment for
Protection of Workers
This standard is issued under the fixed designation F 968; 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.
e NOTE—A precision and bias statement was added in May 2004.
1. Scope D256 Test Methods for Determining the Pendulum Impact
Resistance of Notched Specimens of Plastics
1.1 This specification covers plastic guard equipment and
D570 Test Method for Water Absorption of Plastics
guard systems used by workers for temporary insulation on
F 712 Test Methods for Electrically Insulating Plastic
electric power circuits.
Guard Equipment for Protection of Workers
1.2 Plastic guard equipment covered by this specification is
2.2 IEEE Standard:
rated for momentary, or brush contact only. Maximum-use
978 Guide for In-Service Maintenance and Electrical Test-
voltages are covered in Annex A1.
ing for Live-Line Tools
1.3 Typical guards covered include, but are not limited to,
2.3 UL Standard:
the following:
94 Tests for Flammability of Plastic Materials for Parts in
1.3.1 Conductor guards and connecting covers as follows:
Devices and Appliances
1.3.1.1 Line guards,
1.3.1.2 Line guard connectors,
3. Terminology
1.3.1.3 Insulator covers,
3.1 Definitions of Terms Specific to This Standard:
1.3.1.4 Dead end covers,
3.1.1 insulating plastic guards—devices for temporary in-
1.3.1.5 Bus guards, and
stallation on structures or energized electric power circuits for
1.3.1.6 Bus “T” guards.
electrical protection of personnel or equipment, or both.
1.3.2 Structure and apparatus covers as follows:
3.1.2 self extinguishing—relates to a property of a plastic
1.3.2.1 Pole guards,
materialcompoundedsoastoceasecombustiononremovalof
1.3.2.2 Ridge pin covers,
the source that caused ignition.
1.3.2.3 Switch-blade covers,
1.3.2.4 Arm guards,
4. Significance and Use
1.3.2.5 Cutout covers, and
4.1 This specification covers the minimum electrical,
1.3.2.6 Cross arm guard.
chemical, and physical properties designated by the manufac-
1.4 The values stated in inch-pound units are to be regarded
turer and the detailed procedures by which such properties are
as the standard.
to be determined. The purchaser has the option to perform or
have performed any of these tests and may reject equipment
2. Referenced Documents
that fails to meet the standard criteria. Claims concerning
2.1 ASTM Standards:
failure to meet the specification are subject to verification by
D149 Test Methods for Dielectric Breakdown Voltage and
the manufacturer.
Dielectric Strength of Solid Electrical Insulating Materials
2 4.2 Plastic guard equipment is used for protection against
at Commercial Power Frequencies
accidentalbrushcontactbytheworker.Amarginofsafetyshall
D150 Test Methods for AC Loss Characteristics and Per-
be provided between the maximum voltage at which they are
mittivity (Dielectric Constant) of Solid Electrical Insulat-
used and the proof-test voltage at which they are tested. This
ing Materials
1 3
This specification is under the jurisdiction of ASTM Committee F18 on Annual Book of ASTM Standards, Vol 08.01.
Electrical Protective Equipment for Workers and is the direct responsibility of Annual Book of ASTM Standards, Vol 10.03.
Subcommittee F18.25 on Insulating Cover-up Equipment. AvailablefromtheInstituteofElectricalandElectronicsEngineers,345E.47th
Current edition approved Jan. 15, 1993. Published March 1993. Originally St., New York, NY 10017.
published as F968–85. Last previous edition D968 – 90. Available from Underwriters Laboratories, 333 Pfingsten Rd., Northbrook, IL
Annual Book of ASTM Standards, Vol 10.01. 60062.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
e1
F 968 – 93 (2002)
relationshipisshowninTableA1.1.Theequipmentisdesigned 6.1.2 Name-description of guard or cover,
only for phase-to-ground or coveredphase-to-covered-phase 6.1.3 Type, see 4.1,
exposure. 6.1.4 Grade, see 4.2,
6.1.5 Class, see 4.3, and
NOTE 1—RubberinsulatingequipmentisrealisticallylimitedtoClass4
6.1.6 Size, if applicable, see Section 8.
materialinthedesignspecificationstandards.Plasticguardequipmenthas
been designed to go beyond these voltages and provide a satisfactory
NOTE 2—Atypicalorderingdescriptionisasfollows:100LineGuards,
degree of worker protection. Major differences exist in use criteria
ASTM Specification F968, Type I, Grade 1, Class 3A, 4.5-ft long.
between the rubber and the plastic guard equipment. Each glove, sleeve,
NOTE 3—It is expected that manufacturers will publish catalog data
orotherarticleofrubberinsulatingequipmenthasagivensafetyfactorfor
conforming to this specification that will combine the requirements of
the phase to phase voltage on which it may be used and the class or proof
6.1.2-6.1.6 in a single product number. With that system, a typical order
voltageatwhichitistested.Plasticguardequipment,however,isdesigned
description is: 100 (Smith Manufacturing Co., Product No. XXXX) Line
toprovideasatisfactorysafetyfactoronlywhenusedinaphase-to-ground
Guards, ASTM Specification F968.
exposure.Ifexposureisphase-to-phase,thenasatisfactorysafetyfactoris
only provided if the exposure is covered-phase-to-covered-phase.
7. Materials
4.3 Work practices vary from user to user, dependent upon
7.1 Principal construction of insulating body shells shall be
many factors. These may include, but are not limited to,
in accordance with the material requirements as follows:
operating system voltages, construction design, work proce-
7.1.1 Type I Guards—Minimum 1.5 ft·lbf/in. (80.06 J/m of
dure techniques, weather conditions, etc. Therefore, except for
notch) notched izod impact strength at−20°F(−29°C); maxi-
the restrictions set forth in this specification because of design
mum water absorption 0.1% by weight; minimum 380 V/mL
limitations, the use and maintenance of this equipment is
(0.025 mm) dielectric strength.
beyond the scope of this specification.
7.1.2 Type II Guards—Minimum 1.0 ft·lbf/in. (53.4 J/m)
4.4 It is common practice and the responsibility of the user
notched izod impact strength at−20°F(−29°C); maximum
of this type of protective equipment to prepare complete
water absorption 0.5% by weight; minimum 320V/mL(0.025
instructions and regulations to govern in detail the correct and
mm) dielectric strength; 94 V-O flame retardancy.
safe use of such equipment.
7.1.3 Type III Guards—Minimum 3.0 ft·lbf/in. (160.1 J/m
of notch) notched izod impact strength at−20°F(−29°C);
5. Classification
maximum water absorption 0.09% by weight; minimum 300
V/mL(0.025mm)dielectricstrength;94V-Oflameretardancy.
5.1 Guards are furnished in three types of materials speci-
fied in Section 6 and explained as follows: 7.1.4 Material ratings for Notched Izod Impact Strength
shall be in accordance with Test Methods D256, Method A.
5.1.1 Type I guards are constructed of plastic material
having mechanical impact properties suitable for cold weather 7.1.5 Material ratings for water absorption shall be in
accordance with Test Method D570.
service.
5.1.2 Type II guards have self-extinguishing plastic con- 7.1.6 Material ratings for dielectric strength shall be in
accordance with Test Method D149.
struction.
7.1.7 Material ratings for flame retardancy shall be in
5.1.3 Type III guards are constructed of self-extinguishing
accordance with UL Standard94.
plastic material having mechanical impact pr
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