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ASTM B787/B787M-04(2014)
Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent InsulationMore info
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 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).
| Author | ASTM |
|---|---|
| Editor | ASTM |
| Document type | Standard |
| Format | File |
| Confirmation date | 2014-09-01 |
| ICS | 29.060.20 : Cables |
| Number of pages | 6 |
| Replace | ASTM B787/B787M-04(2009) |
| Set | ASTMVOL0203 |
| Year | 2004 |
| Document history | ASTM B787/B787M-04(2009) |
| Country | USA |
| Keyword | ASTM 787;ASTM B787;ASTM B787;10.1520/B0787_B0787M-04R14 |