ASTM B835-14(R2020) pdf free download

ASTM B835-14(R2020) pdf free download.Standard Specification for Compact Round Stranded Copper Conductors Using Single Input Wire Construction
1. Scope
1.1 This specification covers bare compact round stranded conductors made from uncoated copper wires of a single input wire (SIW) diameter for general use in covered or insulated electrical wires or cables. These conductors shall be con- structed with one or more layers of helically laid compacted wires (Explanatory Note 1, Note 2, and Note 3). 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.2.1 For density, resistivity and temperature, the values stated in SI units are to be regarded as standard. 1.3 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
6. Joints
6.1 Welds and brazes may be made in rods or in wires prior to final drawing. 6.2 Welds and brazes may be made in the individual wires for compact conductors, but they shall not be closer together than 1 ft (0.3 m) for conductor of19 wires or less or closer than 1 ft (0.3 m) in a layer for conductor of more than 19 wires. 6.3 No joint or splice shall be made in a compact-stranded conductor as a whole.
7. Lay
7.1 The length of lay shall not be less than 8 or more than 16 times the outside diameter of the completed conductor.7.2 The direction of lay of the outer layer shall be left-hand, and it may be reversed or unidirectional in successive layers. 7.3 Other lay requirements may be furnished upon special agreement between the manufacturer and the purchaser.
8. Construction
8.1 The construction of the compact round SIW stranded conductors shall be as given in Table 1. 8.2 Wires used in the fabrication of the compact round conductor shall be of such dimensions as to produce a finished conductor as prescribed in Table 1.
9. Density
9.1 For the purpose of calculating mass per unit length, cross sections, and so forth, the density of the copper shall be taken as 8.89 g/cm 3 (0.32117 lb/in. 3 ) at 20°C.
10. Mass and Electrical Resistance
10.1 The mass and electrical resistance of a unit length of stranded unsealed conductor are a function of the length of lay. The approximate mass and electrical resistance may be deter- mined using an increment of 2 %. When greater accuracy is desired, the increment based on the specific lay of the conduc- tor may be calculated (Explanatory Note 4). 10.2 The maximum electrical resistance of a unit length of stranded conductor shall not exceed 102 % of the nominal dc resistance shown in Table 1. When the dc resistance is measured at other than 20°C, it is to be corrected by using the multiplying factor given in Table 2. 10.3 For conductors to be used in covered or insulated wires or cables, dc resistance measurement may be used instead of the method outlined in Section 11, to determine compliance with this specification.
11. Variation in Area
11.1 The cross-sectional area of the compact round conduc- tor shall not be less than 98 % of the cross-sectional area as specified in Column 1 of Table 1. 11.2 The manufacturer shall determine the cross-sectional area by Test Method B263. In applying this test method, the increment in mass per unit length resulting from stranding may be the applicable value specified in 10.1 or may be calculated from the measured dimensions ofthe sample under test. In case of a question regarding area compliance, the actual mass per unit length increment due to stranding shall be calculated.