阻燃防火材料-网上贸易平台 | | WAP浏览
服务热线:4006555305
当前位置: 首页 » 防火测试中心 » 各国标准法规 » 美国 » 正文

ASTM B 787/B 787M 连续绝缘用19股金属线组合单层绞线铜导线标准规范

放大字体  缩小字体 发布日期:2012-02-08   浏览次数:120  分享到: 分享到腾讯微博
ASTM B 787/B 787M 连续绝缘用19股金属线组合单层绞线铜导线标准规范
ASTM B 787/B 787M Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation
ASTM B 787/B 787M 连续绝缘用19股金属线组合单层绞线铜导线标准规范
This specification covers electrical contact alloys with the nominal composition of 75% silver, 24.5% copper, and 0.5% nickel in the form of rods, wires, strips, and sheets. Raw materials shall be of such quality and purity that the products, which shall be finished by such operations as cold working, heat treatment, annealing, turning, grinding, or pickling, shall adhere to the chemical composition and mechanical property requirements prescribed here. Besides analysis for the elements silver, copper, and nickel, further analysis is to be made for suspected or indicated impurities, such as zinc, iron, cadmium, and lead, to make sure that their total does not exceed specified limits. Mechanical tests, which are to be conducted at room temperature, shall evaluate the materials' tensile strength, elongation, Rockwell hardness, and area and thickness reduction.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. 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 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).
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.

2. Referenced Documents (purchase separately)
ASTM Standards
B1 Specification for Hard-Drawn Copper Wire
B2 Specification for Medium-Hard-Drawn Copper Wire
B3 Specification for Soft or Annealed Copper Wire
B33 Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes
B189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes
B246 Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical Purposes
B263 Test Method for Determination of Cross-Sectional Area of Stranded Conductors
B354 Terminology Relating to Uninsulated Metallic Electrical Conductors
Index Terms
Electrical power systems--specifications; Insulated wire and cable--specifications; Mechanical analysis/testing; Rated strength (electrical conductor wire); Stranded copper electrical conductors--specifications; Strength--insulation applications; Unilay-stranded copper electrical conductors;

  详情请咨询
  防火资源网-阻燃防火测试中心
  电话:(+86)0592-5056213
  传真:(+86)0592-5105807
  邮件:firetest@firetc.com

凡注明"防火资源网"的所有作品,由<防火资源网>整理编辑,任何组织未经<防火资源网>及其拥有者授权,不得复制、转载、摘编或利用其它方式应用于任何商业行为。

 
 
[ 防火测试中心搜索 ]  [ ]  [ 告诉好友 ]  [ 打印本文 ]  [ 关闭窗口 ]  [ 返回顶部 ]

 

 
 
推荐防火测试
推荐图文
点击排行
 
 
网站首页 | 广告服务 | 关于我们 | 联系方式 | 服务协议 | 版权声明 | 网站地图 | 友情链接 | 网站留言 | 旧版本 | 闽ICP备09009213号
©2019-2021 FIRETC.COM All Rights Reserved   备案号:闽ICP备09009213号-1在线客服 点击QQ交谈/留言 点击QQ交谈/留言