ASTM B785-93

Standard Specification for Compact Round Modified Concentric-Lay-Stranded Copper Conductors For Use in Insulated Electrical Cables (Withdrawn 1998)

General Information

• Status: Withdrawn
• Withdrawal Date: 09-Mar-1998
• ICS: 29.060.20 - Cables
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.04 - Conductors of Copper and Copper Alloys

Standards Content (Sample)

ASTM B785 93 0759530 0532568 T37
Designation: B 785 - 93 AMERICAN SOCIETY FOR TESTING AND MATERIALS
191 6 Race St. Philadelphia, Pa 191 03
Reprinted from the Annual Book of ASTM Standard:;. Copyright ASTM
If not listed in the current combined index will appea' in the next edition
Standard Specification for
Compact Round Modified Concentric-Lay-Stranded Copper
Conductors for Use in Insulated Electrical Cables'
This standard is issued under the fixed designation B 785; the number immediately following the designation indicates the yeax 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 (0 indicates an editorial change since the last revision or reapproval.
3.1.3 Packaging (Section 16),
1. Scope
3.1.4 Special package marking (Section 1 5),
1.1 This specification covers bare compact round modi-
3.1.5 Place of inspection (Section 14), and
fied concentric-lay-stranded conductors made from un-
3.1.6 In addition, Supplementary Requirements shall
coated round copper wires for use in insulated electrical
apply only when specified by the purchaser in the inquiry,
cables. These conductors shall be constructed with a central
contract, or purchase order for direct procurement by
core consisting of not more than seven wires, surrounded by
agencies of the U.S. Government (Sl, S2, aiid S3), (Explan-
one or more layers of helically laid compacted wires (Explan-
atory Note 2).
atory Note 1).
1.2 The SI values of density and resistivity are to be
4. Requirements for Wires
regarded as standard. For all other properties the inch-pound
4.1 Before stranding and compacting the copper wire shall
values are to be regarded as standard, and the SI units may
meet all of the requirements of Specification B 3.
be approximate.
4.2 Wire shaped before stranding shall meet the require-
NOTE I-The significant differences in this specification from Spec-
B 3, except for diameter tolerance.
ments of Specification
ification B 496 are as follows: (I) the central core is permitted to contain
The elongation requirement shall be the same as round wires
up to seven wires drawn into the assembly with an infinite length of lay
of equal nominal area. The area tolerance for shaped wires
while Specification B 8 permits only one, and (2) the construction is
shall be such that the finished conductor conforms to Section
only applicable to stranded assemblies of 19 or more wires.
11.
2. Referenced Documents
5. Joints
2.1 The following documents of the issue in effect at the
5.1 Welds and brazes may be made in rods or in wires
date of material purchase form a part of this specification to
prior to final drawing.
the extent referenced herein.
5.2 Welds and brazes may be made in the individual
ASTM Standards:
2.1.1
round drawn wires for compact conductors, but shall not be
B 3 Specification for Soft or Annealed Copper Wire2
closer together than 1 Et for conductor of 19 wires or less or
B 8 Specification for Concentric-Lay-Stranded Copper
closer than 1 ft in a layer for conductor of more than 19
Conductors, Hard, Medium-Hard, or Soft2
wires.
B 263 Test Method for Determination of Cross-Sectional
5.3 No joint nor splice shall be made in a compact-
Area of Stranded Conductors2
stranded conductor as a whole.
B 354 Definitions of Terms Relating to Uninsulated
Metallic Electrical Conductors2
6. Lay
B 496 Specification for Compact Round Concentric-Lay-
6.1 Except for the central core, the length of lay shall be
Stranded Copper Conductors2
not less than eight nor more than sixteen times the outside
2.1.2 Other Siandard:
diameter of the completed conductor.
NBS Handbook loo3
6.2 The direction of lay of the outer layer shall be
left-hand, and it may be reversed or unidirectional in
3. Ordering Information
successive layers.
3.1 Orders for material under this specification shall
7. Construction
include the following information:
3.1.1 Quantity of each size (Table i),
7.1 The construction of the compact round concentric-
3.1.2 Conductor size; circular-mil area or American Wire
lay-stranded conductors shall be as shown in Table 1.
Gage, AWG, (Section 7 and Table i),
7.2 The starting round copper wires used in the fabrica-
tion of the compact round conductor shill be of such
diameter as to produce a finished conductor having a
'This specification is under the jurisdiction of ASTM Committee EI on
nominal cross-sectional area and diameter as prescribed in
Electrical Conductors and is the direct responsibility of Subcommittee BO1.04 on
Table 1.
Conductors of Copper and Copper Alloys.
Current edition approved July 15, 1993. Published September 1993. Originally
published as B 785 - 88. Last previous edition B 785 - 88.
8. Physical and Electrical Tests
Annual Book of ASTM Standards, Vol 02.03.
8.1 Tests for the physical and electrical properties of wires
Available from the
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