ASTM B787/B787M-04(2009)
Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
- Standard No.
- ASTM B787/B787M-04(2009)
- Release Date
- 2004
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM B787/B787M-04(2014)
- Latest
- ASTM B787/B787M-04(2020)
- Scope
1.1 This 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 18212;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).
1.2 For 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.
1.3 The 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.
1.3.1 For 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.
1.3.2 For conductor sizes designated by SI units only, the requirements are stated or derived in SI units.
1.3.3 For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.
1.4 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.
ASTM B787/B787M-04(2009) Referenced Document
- ASTM B1 Standard Specification for Hard-Drawn Copper Wire
- ASTM B189 Standard Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes
- ASTM B2 Standard Specification for Medium-Hard-Drawn Copper Wire
- ASTM B246 Standard Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical Purposes
- ASTM B263 Standard Test Method for Determination of Cross-Sectional Area of Stranded Conductors
- ASTM B3 Standard Specification for Soft or Annealed Copper Wire
- ASTM B33 Standard Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes
- ASTM B354 Standard Terminology Relating to Uninsulated Metallic Electrical Conductors
ASTM B787/B787M-04(2009) history
- 2020 ASTM B787/B787M-04(2020) Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
- 2004 ASTM B787/B787M-04(2014) Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
- 2004 ASTM B787/B787M-04(2009) Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
- 2004 ASTM B787/B787M-04 Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
- 2001 ASTM B787/B787M-01 Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
- 2000 ASTM B787/B787M-00 Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
