ASTM F712-06

    Standard Test Methods and Specifications for Electrically Insulating Plastic Guard Equipment for Protection of Workers


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    1. 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 followsLine guards,

    Line guard connectors,

    Insulator covers,

    Dead-end covers,

    Bus guards, and

    Bus "T" guards.

    1.2.2 Structure and Apparatus Covers as follows Pole guards,

    Ridge pin covers,

    Switch blade covers,

    Arm guards,

    Cutout covers,

    Structural barriers, and

    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.

    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.

    1.5 The values stated in inch-pound units are to be regarded as the standard.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ANSI Standard

    C39.5 Safety Requirements for Electrical and Electronic Measuring and Controlling Instrumentation

    UL Standard

    94 Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

    ASTM Standards

    D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies

    D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics

    D570 Test Method for Water Absorption of Plastics

    IEEE Standard

    IEEE978 Guide for In-Service Maintenance and Electrical Testing for Live-Line Tools


    ICS Code

    ICS Number Code 13.260 (Protection against electric shock. Live working)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard

    DOI: 10.1520/F0712-06

    ASTM International is a member of CrossRef.


    Citation Format

    ASTM F712-06, Standard Test Methods and Specifications for Electrically Insulating Plastic Guard Equipment for Protection of Workers, ASTM International, West Conshohocken, PA, 2006, www.astm.org

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