ASTM F2321-05(2013)

Standard Specification for Flexible Insulated Temporary By-Pass Jumpers

ABSTRACT
These specifications provides the manufacture and testing, as well as individual design, electrical, mechanical, and workmanship requirements for a system of flexible insulated temporary bypass jumpers used on energized power lines and equipment. These specifications for a system of bypass jumpers are covered in four parts as follows: clamps for bypass jumpers; ferrules for bypass jumpers; cable for bypass jumpers; and bypass jumpers (complete assembly with clamps, ferrules, and cable). The use and maintenance of these equipments are not addressed in these specifications.
SCOPE
1.1 These specifications cover the manufacture and testing of flexible insulated temporary bypass jumpers (bypass jumpers) used on energized power lines and equipment.  
1.2 It is common practice for the user of this protective equipment to prepare complete instructions and safety regulations to govern in detail the correct and safe use of such equipment. Also see 4.2.  
1.3 The use and maintenance of this equipment are beyond the scope of these specifications.  
1.4 These specifications for a system of bypass jumpers is covered in four parts as follows:    
Title  
Sections  
Clamps for Bypass Jumpers  
5 – 17  
Ferrules for Bypass Jumpers  
18 – 31  
Cable for Bypass Jumpers  
32 – 40  
Bypass Jumpers (complete assembly
with clamps, ferrules, and cable)  
41 – 55
1.5 Each of the four parts is an entity of itself, but is listed as a part of the system for completeness and clarification.  
1.6 The values stated in SI units are to be regarded as the standard. See ASTM IEEE/ASTM SI 10.  
1.7 The following precautionary caveat pertains only to the test method portions, Sections 13, 26, 48, and 55 of these specifications. 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 requirements prior to use.

General Information

• Status: Historical
• Publication Date: 30-Sep-2013
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: F18 - Electrical Protective Equipment for Workers
• Drafting Committee: F18.45 - Mechanical Apparatus

Relations

• Replaces: ASTM F2321-05 - Standard Specification for Flexible Insulated Temporary By-Pass Jumpers
• Effective Date: 01-Oct-2013
• Replaced By: ASTM F2321-14 - Standard Specification for Flexible and Rigid Insulated Temporary By-Pass Jumpers
• Effective Date: 15-Aug-2014

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:F2321 −05(Reapproved 2013)
Standard Specification for
Flexible Insulated Temporary By-Pass Jumpers
This standard is issued under the fixed designation F2321; 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 Wire for Electrical Purposes
B172 Specification for Rope-Lay-Stranded Copper Conduc-
1.1 These specifications cover the manufacture and testing
torsHavingBunch-StrandedMembers,forElectricalCon-
of flexible insulated temporary bypass jumpers (bypass jump-
ductors
ers) used on energized power lines and equipment.
B173 Specification for Rope-Lay-Stranded Copper Conduc-
1.2 It is common practice for the user of this protective
tors Having Concentric-Stranded Members, for Electrical
equipment to prepare complete instructions and safety regula-
Conductors
tions to govern in detail the correct and safe use of such
D2768 Specification for General-Purpose Ethylene-
equipment. Also see 4.2.
Propylene Rubber Jacket for Wire and Cable (Withdrawn
2007)
1.3 The use and maintenance of this equipment are beyond
the scope of these specifications. D2770 Specification for Ozone-Resisting Ethylene-
Propylene Rubber Integral Insulation and Jacket for Wire
1.4 These specifications for a system of bypass jumpers is
and Cable (Withdrawn 2007)
covered in four parts as follows:
D2802 Specification for Ozone-Resistant Ethylene-Alkene
Title Sections
Polymer Insulation for Wire and Cable
Clamps for Bypass Jumpers 5–17
D2865 Practice for Calibration of Standards and Equipment
Ferrules for Bypass Jumpers 18–31
Cable for Bypass Jumpers 32–40
for Electrical Insulating Materials Testing
Bypass Jumpers (complete assembly 41–55
E8 Test Methods for Tension Testing of Metallic Materials
with clamps, ferrules, and cable)
F819 Terminology Relating to Electrical Protective Equip-
1.5 Each of the four parts is an entity of itself, but is listed
ment for Workers
as a part of the system for completeness and clarification.
IEEE/ASTM SI 10 American National Standard for Metric
1.6 The values stated in SI units are to be regarded as the
Practice
standard. See ASTM IEEE/ASTM SI 10.
2.2 ANSI Standards:
1.7 The following precautionary caveat pertains only to the
ANSI C39.5 Safety Requirements for Electrical and Elec-
test method portions, Sections 13, 26, 48, and 55 of these
tronic Measuring and Controlling Instruments
specifications. This standard does not purport to address all of
ANSIC84.1 VoltageRatingsforElectricPowerSystemsand
the safety concerns, if any, associated with its use. It is the
Equipment (60 Hz)
responsibility of the user of this standard to establish appro-
ANSI C119.4 American National Standard for Electrical
priate safety and health practices and determine the applica-
Connectors
bility of regulatory requirements prior to use.
2.3 NEMA Standard:
WC 8 Ethylene-Propylene-Rubber Insulated Wire and Cable
2. Referenced Documents
for theTransmission and Distribution of Electrical Energy
2.1 ASTM Standards:
(formerly ICEA S-68-516)
B33 Specification for Tin-Coated Soft or Annealed Copper
3. Terminology
1 3.1 Definitions:
This specification is under the jurisdiction of ASTM Committee F18 on
Electrical Protective Equipment for Workers and is the direct responsibility of
Subcommittee F18.45 on Mechanical Apparatus.
Current edition approved Oct. 1, 2013. Published October 2013. Originally
approved in 2003. Last previous edition approved in 2005 as F2321–05. DOI: The last approved version of this historical standard is referenced on
10.1520/F2321-05R13. www.astm.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
contactASTM Customer Service at [e-mail]. ForAnnual Book ofASTM 4th Floor, New York, NY 10036.
Standards volume information, refer to the standard’s Document Summary page on Available from National Electrical Manufacturers Association (NEMA), 1300
the ASTM website. N. 17th St., Suite 1847, Rosslyn, VA 22209.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2321−05 (2013)
TABLE 1 Proof Test/Use Voltage Relationship
3.1.1 flexible insulated temporary bypass jumpers—devices
designed and used to keep electric supply circuits effectively Maximum AC Proof DC Proof
Voltage
Use Voltage Test Voltage Test Voltage
continuous (electrically bridged) for short periods of time at
Rating
(rms) V (rms) V (avg) V
work locations when conductors or equipment may otherwise
15 kV 15 000 20 000 50 000
be opened or made electrically discontinuous during work
25 kV 25 000 30 000 60 000
35 kV 35 000 40 000 70 000
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.
CLAMPS FOR BYPASS JUMPERS
3.1.2 voltage, normal design—a nominal value consistent
5. Scope
with the latest revision of ANSI C84.1, assigned to the circuit
5.1 Thisspecificationcoversclampsusedintheassemblyof
or system for the purpose of conveniently designating its
bypass jumpers.
voltage class.
3.1.3 voltage, maximum use—the ac voltage (rms) classifi-
6. Classification
cation of the protective equipment that designates the maxi-
6.1 Clamps are furnished in, but not limited to, two styles
mum nominal design voltage of the energized system that may
according to their function and method of installation.
be safely worked. The nominal design voltage is equal to
6.1.1 Style I—Clamps equipped with insulated handles for
phase-to-phase voltage on multiphase circuits.
installation on energized conductors with rubber gloves. See
3.1.3.1 Discussion—If there is no multiphase exposure in a
Fig. 1.
system area, and the voltage exposure is limited to phase
6.1.1.1 Insulated handles may be either clear or opaque.
(polarityondcsystems)togroundpotential,thephase(polarity
6.1.1.2 Insulating materials used in this specification in-
ondcsystems)togroundpotentialshallbeconsideredtobethe
clude thermo-set plastic, elastomers, elastomer compounds,
nominal design voltage.
thermoplastic polymers or any combination, regardless of
3.1.3.2 Discussion—If electrical equipment and devices are
origin.
insulatedorisolated,orboth,suchthatthemultiphaseexposure
6.1.2 Style II—Clamps equipped with provisions for instal-
on a grounded wye circuit is removed, then the nominal design
lation on energized conductors with live line tools. See Figs.
voltage may be considered as the phase-to-ground voltage on
2-4.
that circuit.
6.1.2.1 Clamps are furnished according to mechanical
strength and current rating. See Table 2.
NOTE 1—The work practices and methods associated with removing
multiphase exposures at any given work site are not addressed in this
6.2 Clamps are furnished in two classes according to the
specification.
characteristics of the main contact jaws.
3.2 For definitions of other terms, refer to Terminology
6.2.1 Class A—Clamp jaws with smooth contact surfaces.
F819.
6.2.2 Class B—Clamp jaws with serrations, crosshatching
or other means intended to abrade or bite through corrosion
4. Significance and Use
products on the surface of the conductor being clamped.
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’sdesignation.Claimsforfailuretomeetthespecificationare
subject to verification by the manufacturer.
4.2 Bypass 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. Bypass 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 bypass 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. FIG. 1Style I Clamp
F2321−05 (2013)
FIG. 2Style II “C” Shape Clamp
FIG. 4Style II Duck Bill Shape Clamp
TABLE 2 Clamp Torque Strength, min—Style II Clamps
Cable Continuous
A
Yield Ultimate
Size Current
(AWG) A, rms, 60 Hz N-m (lbf in.) N-m (lbf in.)
#2 200A 32 (280) 37 (330)
1/0 250A 32 (280) 37 (330)
2/0 300A 32 (280) 37 (330)
4/0 400A 37 (330) 45 (400)
A
Yield shall mean no permanent deformation such that the clamp cannot be
reused throughout its entire range of application.
9. Materials
9.1 Current carrying parts of copper base or aluminum base
alloyshallmeetthematerialpropertiesshowninTable3andin
accordance with Test Methods E8.
10. Electrical and Mechanical Properties
FIG. 3Style II “C” Shape Clamp
10.1 Materials used shall meet the requirements of 9.1.
10.2 Electrical and mechanical properties shall conform to
the requirements prescribed in Tables 1-3 and with the follow-
7. Sizes
ing:
7.1 Clamp size is the combination of the main contact and
NOTE 2—Style II clamps are uninsulated and do not require confor-
cable size ranges as listed by the manufacturers.
mance with the electrical requirements of Table 1.
10.2.1 Clamps shall accept hand assembly of all cables
8. Ordering Information
fitted with compatible ferrules as rated per Table 2.
8.1 Orders for clamps under this specification shall include 10.2.2 Main contacts shall accept and clamp all conductors
this ASTM designation and the following information: according to the manufacturer’s recommendation.
10.2.3 Style II clamps shall have the following properties:
8.1.1 Quantity,
10.2.3.1 In the event the clamp is over-torqued during
8.1.2 Name (Bypass Jumper Clamp),
installation, normal fracture shall be such that the attached
8.1.3 Main contact size ranges, conductor descriptions, and
cableremainsundercontrolbybeingretainedwiththeliveline
type of materials which are to be clamped,
8.1.4 Cable size, material, and description by which clamps
are to be assembled,
TABLE 3 Material Properties
8.1.5 Style (see 6.1),
Copper Base Alloy Aluminum Base Alloy
Tensile Strength, min. 207 Mpa (30 000 psi) 207 Mpa (30 000 psi)
8.1.6 Class (see 6.2), and
Yield Strength, min. 90 Mpa (13 000 psi) 138 Mpa (20 000 psi)
8.1.7 Clamps for bypass jumpers, at the customer’s request,
Elongation, min 6 % 3 %
shall meet ANSI C119.4.
F2321−05 (2013)
tool. Clamps with an ultimate torque strength exceeding 45 apply torsion force to the main screw. Force may be applied to
N-m (400 lbf in.) are exempt from this provision. other devices designed to secure the clamp on the conductor.
10.2.3.2 Cable termination shall include a cable support or 13.2.2 Measure torque by a torque wrench that indicates
shall be made to accept a cable supporting ferrule compatible torque directly or by other manner easily convertible.
with the clamp. This support shall secure the entire cable over 13.2.3 The main conductor is defined as the material(s) on
the jacket and is provided in addition to the electrical connec- which the clamp is rated to be used.
tion to the strand.
13.2.4 Yield and ultimate strength shall equal or exceed the
10.2.3.3 Clamps shall be compatible with clamp sticks and values shown in Table 2.
shallfitsecurelyinsidethe13mm( ⁄2-in.)wideslotinthehead
13.3 Continuous Current Rating:
of the stick.
13.3.1 Test the clamp at the continuous current level for
10.2.4 Main contacts shall accept and clamp all conductors
which it is rated. The temperature shall be measured at the
or structural members in accordance with the manufacturer’s
warmest spot on clamp and on the metal strand at the midpoint
rating.
of an attached cable, which is a minimum of 1.5 m (5 ft.) in
length. The maximum temperature of the clamp shall be lower
11. Workmanship, Finish, and Appearance
than the midpoint temperature of the maximum size copper
main or tap cable for which the clamp is rated.
11.1 Components shall be free of structural porosity, fins,
sharpedges,splits,cracksandotherdefectsthataffecthandling
or performance. 14. Inspection and Product Testing
11.2 All parts shall be formed, machined, and assembled 14.1 The clamps shall be inspected and tested as follows:
with sufficient accuracy for smooth operation by hand, and 14.1.1 Verification of the main contact and cable capacities
shall be free of excessive looseness to the extent detrimental to are in accordance with 10.2.2 and 10.2.3.
repeated applications at the recommended installing torque. 14.1.2 Visualinspectionandhandoperationshallbedoneto
verify workmanship, finish, and appearance, which shall be in
11.3 ClassA(smoothjaw)clampsshallhavesmoothcontact
accordance with Section 11.
surfaces free of burrs, fins, or other protuberances that would
14.1.3 Torque test on a test sample shall be in accordance
impair performance.
with 13.2.
11.4 Class B (serrated jaw) clamps shall have longitudinally
level surface, that, with clamp movement as specified by the
15. Acceptance, Rejection and Rehearing
manufacturer, will provide a cleaning effect on the surface of
15.1 At the option of the purchaser, a production lot may be
the conductor.
subjected to the following:
11.5 Slag grinding marks, depressions, and other surface
15.1.1 Inspection in accordance with 14.1 for operation,
irregularities that do not affect strength, performance, or
main contact range, workmanship, and appearance. Individual
handling are not cause for rejection.
clamps that do not conform may be rejected.
15.2 Material that fails to conform to the requirements of
12. Sampling
thisspecificationmayberejected.Rejectionshouldbereported
12.1 A product model represents a manufacturer’s design
to the producer or supplier promptly and in writing. In case of
specification standard according to which the production lot is
dissatisfaction with the results of the test, the producer or
manufactured.
supplier may make claim for a rehearing.
12.2 A production lot shall consist of all clamps of one
15.3 If electrical testing, mechanical testing, or both, are
production model produced at one time.
...