ASTM B 787/B787M:2004 : R2020
Current
The latest, up-to-date edition.
Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
Hardcopy , PDF
English
01-01-2020
Important note : Users cannot be edited or removed once added to your Multi user PDF.| Committee |
B 01
|
| DocumentType |
Standard
|
| Pages |
6
|
| ProductNote |
This standard is also refers to NBS Handbook 100.
|
| PublisherName |
American Society for Testing and Materials
|
| Status |
Current
|
| Supersedes |
1.1This specification covers bare combination unilay-stranded conductors made from round copper wires, either uncoated or coated with tin or lead alloy for insulated conductors for electrical purposes. These conductors shall be constructed with a central core wire surrounded by two layers of helically laid wires, resulting in an outer diameter equal to the compressed-stranded equivalent conductor. (See Explanatory Note 1 and Note 2.)
Note 1:For the purpose of this specification, combination unilay conductor is defined as follows: a central core wire surrounded by a layer of six helically laid wires of the same diameter as the core wire with a helically laid outer layer containing six smaller wires alternated between six wires of the same diameter as the wires in the layer underneath. Both layers have a common length and direction of lay (see Fig. 1).
FIG. 1Cross Section of Conductor
1.2For the purpose of this specification, normal conductor classification (Class AA, A, B, C) is not applicable as these conductors are intended for subsequent insulation. The descriptive term combination unilay-stranded shall be used in place of conductor classification.
1.3The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3.1For conductor sizes designated by AWG or kcmil, the requirements in SI units have been numerically converted from corresponding values, stated or derived, in inch-pound units.
1.3.2For conductor sizes designated by SI units only, the requirements are stated or derived in SI units.
1.3.3For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.
1.4This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
| ASTM B 3 : 2013 : R2024 | Standard Specification for Soft or Annealed Copper Wire |
| ASTM B 1 : 1995 | Standard Specification for Hard-Drawn Copper Wire |
| ASTM B 189 : 2005 : R2021 | Standard Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes |
| ASTM B 3 : 1995 | Standard Specification for Soft or Annealed Copper Wire |
| ASTM B 354 : 2023 | Standard Terminology Relating to Uninsulated Metallic Electrical Conductors |
| ASTM B 246 : 2015 | Standard Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical Purposes |
| ASTM B 189 : 2005 : R2015 | Standard Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes |
| ASTM B 246 : 2015 : R2021 | Standard Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical Purposes |
| ASTM B 3 : 2013 : R2018 | Standard Specification for Soft or Annealed Copper Wire |
| ASTM B 354 : 2019 | Standard Terminology Relating to Uninsulated Metallic Electrical Conductors |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.