ASTM B787-04 (2020) pdf free.Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductorsfor Subsequent Insulation.
The mass and electrical resistance of a unit length ofstranded conductor are a function of the length of lay. Theapproximate mass and electrical resistance may be determinedusing the standard increment of 2 %. When greater accuracy isdesired, the increment based on the specific lay of the conductor may be calculated (Explanatory Note 8).
The cross-sectional area of the completed conductorshall be not less than 98 % of the area indicated in Column 1of Table 1. Unless otherwise specified by the purchaser,themanufacturer shall determine the crosssectional area by thefollowing method:
The cross-sectional area of a conductor may bedetermined by Test Method B263.In applying this method, theincrement in mass resulting from stranding may be the appli-cable value specified in 11.1 or may be calculated from themeasured component dimensions of the sample under test. Incase of question regarding area compliance, the actual massincrement due to stranding shall be calculated.
ASTM B787 pdf download.Unless otherwise specified in the contract or purchaseorder，the manufacturer shall be responsible for the performance of all inspection and test requirements specified.
All inspections and tests shall be made at the place ofmanufacture unless otherwise especially agreed upon betweenthe manufacturer and the purchaser at the time of purchase.13.3 The manufacturer shall afford the inspector represent-ing the purchaser all reasonable manufacturer’s facilities tosatisfy him that the material is being furnished in accordancewith this specification.
The net weight，length (or lengths and number oflengths, if more than one length is included in the package),size, kind of conductor， purchase order number, and any othermarks required by the purchase order shall be marked on a tagattached to the end of the conductor inside of the package. Thesame information,together with the manufacturer’s serialnumber (if any) and all shipping marks required by thepurchaser， shall appear on the outside of each package.
Package sizes for conductors shall be agreed uponbetween the manufacturer and the purchaser in the placing ofindividual orders (Explanatory Note 9).
The conductors shall be protected against damage inordinary handling and shipping. If heavy wood lagging isrequired, it shall be specified by the purchaser at the time ofpurchase.ASTM B787 pdf download.