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 surface of the coating shall be smooth and uniform. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. To convert from inches to millimetres multiply by A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Outside Diameter, max, in.
B26 comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Alloy Class 1 3 4 5 6 Color purple yellow red pink ivory Values shown for other classes are for information only.
This slope is determined from the following equation: The values given in parentheses are mathematical conversions to SI units that are provided for b67 only and are not considered standard.
D in Diameter in. The mean temperature coefficient of resistance referred to Copyright? Originally approved in Each bare wire should conform to the requirements for nominal resistivity, elongation, thermal electromotive force with ast, to copper, and the temperature coefficient of resistance contained in this b627.
A number in parentheses indicates the year of last reapproval. B Alloy Classes 1a, 1b, 1c, 2a, 2b, 3a, 4, and 6 are designed to give a low emf versus copper. The tension on the wire shall not exceed one half of its yield strength. C The maximum temperature values listed apply to the alloy wire only.
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 enamel shall not be underbaked so that one turn adheres to the next on a spool. Historical Version s – view previous versions of standard.
Nominal Electrical Resistance per Unit Length 7. All alloys covered by these speci?
Temperature Coefficient of Resistance 8. NOTE 1—When ribbon or? It shall be free from voids or bare spots and have a minimum of back twist. Current edition approved May 1, To convert from pounds to kilograms multiply by 0. The wires and ribbons, which may have insulated coverings or enamel coatings, are recommended for use adtm wire-wound resistance units like precision resistors and other similar applications, but not for use as electrical heating elements.
The second covering shall be wrapped in the opposite direction from the?
ASTM B267 – 07(2018), Standard Specification for Wire for Use In Wire-Wound Resistors
This specification covers round wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a alloys. 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.
B — 07 Standard Speci? The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Last previous edition approved in as B — 90 The test shall be made 2 to 10 min after removal of the wire from the oil, lightly wiping off the excess oil.
D If metric sizes are desired, 1 in. The electrical resistance per unit length can be determined more accurately than the dimensions of very small wire. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
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 to the unaided eye. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Ribbon actually is made to a speci?
ASTM-B | Standard Specification for Wire for Use In Wire-Wound Resistors | Document Center, Inc.
Maximum indicates the maximum deviation from zero and the plus or minus sign the polarity of the couple. The nominal resistance per unit length for a round wire is calculated from the nominal resistivity and nominal cross-sectional area. It is the responsibility of the user of this standard to become familiar with all hazards including those identi?
B — 07 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
It shall include both single and double coverings. Permissible Variations in Dimensions Caution should be exercised pending knowledge of the maximum temperature of use for the coating material involved. No further reproductions authorized. 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.