ASTM F2321-14(R2020) pdf free download
ASTM F2321-14(R2020) pdf free download.Standard Specification for Flexible and Rigid Insulated Temporary By-Pass Jumpers
3. Terminology
3.1 Definitions: 3.1.1 flexible and rigid insulated temporary By-Pass jumpers—devices designed and used to keep electric supply circuits effectively continuous (electrically bridged) for short periods of time at work locations when conductors or equip- ment may otherwise be opened or made electrically discon- tinuous during work operations. 3.1.1.1 Discussion—The devices are normally installed, used, and removed as part of a protective insulating system composed of insulating covers and/or observances of required minimum safe approach distances for workers. 3.1.2 voltage, normal design—a nominal value consistent with the latest revision of ANSI C84.1, assigned to the circuit or system for the purpose of conveniently designating its voltage class. 3.1.3 voltage, maximum use—the ac voltage (rms) classifi- cation of the protective equipment that designates the maxi- mum nominal design voltage of the energized system that may be safely worked. The nominal design voltage is equal to phase-to-phase voltage on multiphase circuits. 3.1.3.1 Discussion—If there is no multiphase exposure in a system area, and the voltage exposure is limited to phase (polarity on dc systems) to ground potential, the phase (polarity on dc systems) to ground potential shall be considered to be the nominal design voltage. 3.1.3.2 Discussion—If electrical equipment and devices are insulated or isolated, or both, such that the multiphase exposure on a grounded wye circuit is removed, then the nominal design voltage may be considered as the phase-to-ground voltage on that circuit. N OTE 1—The work practices and methods associated with removing multiphase exposures at any given work site are not addressed in this specification. 3.2 For definitions of other terms, refer to Terminology F819.
4. Significance and Use
4.1 These specifications cover the minimum electrical and physical properties designated by the manufacturer and the detailed procedures by which such properties are to be deter- mined. The purchaser may at his option perform or have performed any of these tests in order to verify the manufactur- er’s designation. Claims for failure to meet the specification are subject to verification by the manufacturer. 4.2 By-Pass jumpers are devices designed and used to keep electrical circuits effectively continuous (electrically bridged) for short periods of time at work locations when conductors or equipment may otherwise be opened or made discontinuous during work operations. By-Pass jumpers are insulated to temporarily protect personnel from brush or accidental contact only; therefore, when authorizing their use, a margin of safety should be provided between the maximum voltage used on, and the proof-test voltage at which they are tested. The relationship between proof-test voltage and the maximum voltage at which By-Pass jumpers are used is shown in Table 1. Warning—Portions of these devices (clamps and ferrules) are not insulated and offer no protection from accidental contact. CLAMPS FOR BY-PASS JUMPERS
5. Scope
5.1 This specification covers clamps used in the assembly of By-Pass jumpers.
6. Classification
6.1 Clamps are furnished in, but not limited to, two styles according to their function and method of installation. 6.1.1 Style I—Clamps equipped with insulated handles for installation on energized conductors with rubber gloves. See Fig. 1. 6.1.1.1 Insulated handles may be either clear or opaque. 6.1.1.2 Insulating materials used in this specification in- clude thermo-set plastic, elastomers, elastomer compounds, thermoplastic polymers or any combination, regardless of origin. 6.1.2 Style II—Clamps equipped with provisions for instal- lation on energized conductors with live line tools. See Fig. 2 and Fig. 3. 6.1.2.1 Clamps are furnished according to mechanical strength and current rating.
