ASTM B Standard Specification for Wire for Use In Wire-Wound Resistors. ASTM-B – Download as PDF File .pdf), Text File .txt) or read online. Non Ferrous Standard. This specification covers round wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a alloys.
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This abstract is a brief summary of the referenced standard. The second covering shall be wrapped in the opposite direction from the? The surface of the coating shall be smooth and uniform.
D If metric sizes are desired, 1 in. Referenced Asmt purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Temperature Coefficient of Resistance 8. Permissible Variations in Dimensions The electrical resistance per unit length can be determined more accurately than the dimensions of very small wire. This is not valid in view of modern rolling equipment and practices, but still is widely used as a basis of description.
Nominal Electrical Resistance per Unit Length 7. NOTE 1—When ribbon or? The tension on the wire shall not exceed one half of its yield strength. All of the information included in this note is based on measurements made in accordance with Test Method B It shall be free from voids or bare spots and have a minimum of back twist. Permissible Variations in Electrical Resistance A number in parentheses indicates the year of last reapproval.
The mean temperature coefficient of resistance referred to Copyright? Originally approved in The enamel shall not be underbaked so that one turn adheres to the next on a spool.
ASTM B267 – 07(2018), Standard Specification for Wire for Use In Wire-Wound Resistors
It is the responsibility of the user of this standard to become familiar with all hazards including those astj Wire larger in diameter than sizes listed in Table 6 may be supplied on spools Table 7 or in coils depending on agreement between the manufacturer and the purchaser.
The nominal resistance per unit length for a round wire is calculated from the nominal resistivity and nominal cross-sectional area. B Alloy Classes 1a, b2677, 1c, 2a, 2b, 3a, 4, and 6 are designed to give a low emf versus copper. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. The test shall be made 2 to 10 min after removal of the wire from the oil, lightly wiping off the excess oil.
Historical Version s – view previous versions of standard. Maximum indicates the maximum deviation from zero and the plus or minus sign the polarity of the couple.
A superscript epsilon e indicates an editorial change since the last revision or reapproval.
ASTM B Standard Specification for Wire for Use In Wire-Wound Resistors_百度文库
Ribbon actually is made to a speci? If you feel that your comments have not received a ast hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. The wires and ribbons, which may have insulated coverings or enamel coatings, are recommended for use in wire-wound resistance units like precision resistors and other similar applications, but not for use as electrical heating elements.
This slope is determined from the following equation: The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
D in Diameter in. B — 07 Standard Speci?
Values shown for other classes are for information only. 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. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Alloy Class 1 3 4 5 6 Color purple yellow red pink ivory Current edition approved May 1, Each bare wire should conform to the requirements for nominal resistivity, elongation, thermal electromotive force with respect to copper, and the temperature coefficient of resistance contained in this specification.
All alloys covered by these speci? This specification covers round wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a alloys.
C The maximum temperature values listed apply to the alloy wire only. To convert from pounds to kilograms multiply by 0. No further reproductions authorized. The covering shall be sufficiently closely wrapped so that, when the wire is bent around a mandrel having a diameter wstm times the overall diameter of the covered wire, using only enough tension to give an even compact layer, the wrappings will not open enough to make the wire underneath visible to the unaided eye.