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# 15_12_86 - WIRE TABLES The resistance per unit length of...

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WIRE TABLES The resistance per unit length of wires of various metals is tabulated here. Values were calculated from resistivity values in the tables “Electrical Resistivity of Pure Metals” and “Electrical Resistivity of Selected Alloys”, which appear in Section 12. In prac- tice, resistance may vary because of differing heat treatments and metal composition. The values in the table refer to 20°C, but val- ues at other temperatures may be calculated from the following resistivity data: Resistivity in 10 –8 m at temperature Metal 0°C 20°C 25°C 100°C Aluminum 2.417 2.650 2.709 3.56 Brass (70% Cu, 30% Zn) 5.87 6.08 6.13 6.91 Constantan (60% Cu, 40% Ni) 45.43 45.38 45.35 45.11 Copper 1.543 1.678 1.712 2.22 Nichrome (79% Ni, 21% Cr) 107.3 107.5 107.6 108.3 Platinum 9.6 10.5 10.7 13.6 Silver 1.467 1.587 1.617 2.07 Tungsten 4.82 5.28 5.39 7.18 Resistance per unit length at 20°C in /m B & S Gauge Diameter (mm) Aluminum Brass Constantan Copper Nichrome Platinum Silver Tungsten 0 8.252 0.000495 0.00114 0.00848 0.000314 0.0201 0.00196 0.000297 0.00099 2 6.543 0.000788 0.00181 0.0135 0.000499 0.0320 0.00312 0.000472 0.00157 4 5.189 0.00125 0.00287 0.0214 0.000793 0.0508 0.00496 0.000750 0.00250 6 4.115 0.00199
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