Table Of Content

U.S. National Bureau of Stnadards Copper wire tattles DEPARTMENT OF COMMERCE Circular OF THE Bureau of Standards S. W. STRATTON, DIRECTOR No. 31 COPPER WIRE TABLES [3cl Edition) Issued October 1, 1914 WASHINGTON GOVERNMENT PRINTING OFFICE 1914 (k lOC. DEPARTMENT OF COMMERCE Circular OP THK Bureau Standards of S. W. STRATTON, Director No. 31 COPPER v:iRE TABLES [3d EdtUon] Issued October 1. 191.4 , (3 ^ WASHIMGTOR GOVERNMENT PRINTING orFICB 1914 IN. 330^ CONTENTS PART HISTORICAL AND KXPLANATORT 1. P»ge. I. Introduction S I. Standard valuesforresistivity and temperature coefficient of copper. — 2. The basisofthe present tables the "International Annealed Copper Stand- ard" g (a) Objectofthe Bureauof Standards'investigations 8 (b) Resistivityofannealed copper p (c) The temperature coefficientofresistanceofcopper lo (d) Calculation of percentconductivity i2 (e) Densityofcopper 13 (f) Resistivityofhard-drawn copper wires 13 (g) Thehighestconductivity found 13 (h) Aluminum 13 3. Statusof the International Annealed CopperStandard 14 II. Wiregages 16 1. Shorthistoryofwire gages 16 2. The American Wire Gage 23 (a) General useof the American Wire Gage 23 (b) The characteristicsof the American Wire Gage 24 (c) Wire tableshortcuts 25 III. Explanationoftables 27 PART TABLES 2. I. Various standard values for the resistivity, temperature coefficient, and density of annealed copper 39 II. Temperature coefficients of copper for different initial temperatures and different conductivities 40 III. Reductionofobservationstostandardtemperature 41 IV. Tabularcomparisonof wire ga^es, diametersin mils 42 V. Tabularcomparisonof wire gages, diametersin millimeters 43 VI. Complete wire table, standard annealed copper, A. W. G., English units 44 VII. Complete wire table, standard ani-aled copperA. W. G.,metricunits 48 VIII. Working table, standard annealed copper wire, A.W. G., Englishunits 52 IX. Working table, standard annealed copper wire, A.W. G., metric units 53 X. Standard annealed copper \vire, (British) Standard Wire Gage 54 XI. Standard annealed copper wire, "Millimeter"Wire Gage 55 XII. Bare concentric-lay cablesofstandard annealed copper, Englishunits 56 XIII. Bareconcentric-lay cablesof standard annealedcopper, metric units 57 XIV. Hard-drawn aluminum n-ire at 20° C (or 58° F), A.W. G., Englishunits 58 XV. Hard-drawn aluminum wire at 20° C, A. W. G., metrictinits 59 PART APPENDIXES 3. I. Theexpressionofresistivity 60 II. Calculationofthe "resistivity-temperature constant" 65 III. The densityof copper 67 rV. Calculationof the resistance and massper unitlength of cables — 71 V. Publication 28of the International Electrotechnical Commission. "International Standardof Resistancefor Copper" 75 3