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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The second covering shall be wrapped in the opposite direction from the? This slope is determined from the following equation: Permissible Variations in Electrical Resistance Maximum indicates the maximum deviation from zero and the plus or minus sign b627 polarity of the couple.
No further reproductions authorized. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Values shown for other classes are for information only. NOTE 1—When ribbon or?
It shall include both single and double coverings. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. The enamel shall not be underbaked so that one turn adheres to the next on a spool. The mean temperature coefficient of resistance referred to Copyright?
The surface of the coating shall be smooth and uniform.
ASTM B267 – 07(2018), Standard Specification for Wire for Use In Wire-Wound Resistors
Originally approved in B Alloy Classes 1a, 1b, 1c, 2a, 2b, 3a, 4, and 6 are designed to give a low emf versus copper. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Permissible Variations in Dimensions 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.
B — 07 Standard Speci?
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. It shall be free from voids or bare spots and have a minimum of back twist. D in Diameter in. Last previous edition approved in as B — 90 This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The electrical resistance per unit length can be determined more accurately than the dimensions of very small wire.
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.
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. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. This abstract is a brief summary of the referenced standard.
Historical Version s – view previous versions of standard.
ASTM B – 07 Standard Specification for Wire for Use In Wire-Wound Resistors
The nominal resistance per unit length for a round wire is calculated from the nominal resistivity and nominal cross-sectional area. Nominal Electrical Resistance per Unit Length 7. 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, astj not for use as electrical heating elements.
All of the information included in this note is based on measurements made in accordance with Test Method B To convert from inches to millimetres multiply by The tension on the asrm shall not exceed one half of its yield strength.
The covering shall be sufficiently closely wrapped so that, when the wire is bent around a mandrel having a diameter ten 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 2b67 the unaided eye.
Temperature Coefficient of Resistance 8. Link to Active This link will always route to the current Active version of the standard.
To convert from pounds to kilograms multiply by 0.
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. Alloy Class 1 3 4 5 6 Color purple yellow red pink ivory C The maximum temperature values listed apply to the alloy wire only.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. All alloys covered by these speci?
This specification covers b276 wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a alloys. A number in parentheses indicates the year of last reapproval.