Section: 15 | Wire Tables |

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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 practice, resistance may vary because of differing heat treatments and metal composition. The values in the table refer to 20 °C, but values at other temperatures may be calculated from the following resistivity data.

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TABLE 1. Resistivity in 10^-8 Ω m at the Indicated 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

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TABLE 2. Resistance per Unit Length at 20 °C in Ω/m

Metal	AWG 0 8.252 mm	AWG 2 6.543 mm	AWG 4 5.189 mm	AWG 6 4.115 mm	AWG 8 3.264 mm	AWG 10 2.588 mm	AWG 12 2.053 mm	AWG 14 1.628 mm	AWG 16 1.291 mm	AWG 18 1.024 mm	AWG 20 0.8118 mm	AWG 22 0.6439 mm	AWG 24 0.5105 mm	AWG 26 0.4049 mm	AWG 28 0.3211 mm	AWG 30 0.2548 mm	AWG 32 0.2019 mm	AWG 34 0.1601 mm	AWG 36 0.1270 mm	AWG 38 0.1007 mm	AWG 40 0.07988 mm
Aluminum	0.000495	0.000788	0.00125	0.00199	0.00317	0.00504	0.0080	0.0127	0.0202	0.0322	0.0512	0.0814	0.129	0.206	0.327	0.520	0.828	1.32	2.09	3.33	5.29
Brass	0.00114	0.00181	0.00287	0.00457	0.00727	0.0115	0.0184	0.0292	0.0464	0.0738	0.117	0.187	0.297	0.472	0.751	1.19	1.9	3.02	4.80	7.63	12.1
Constantan	0.00848	0.0135	0.0214	0.0341	0.0542	0.0863	0.137	0.218	0.347	0.551	0.877	1.39	2.22	3.52	5.60	8.90	14.2	22.5	35.8	57.0	90.5
Copper	0.000314	0.000499	0.000793	0.00126	0.00200	0.00319	0.00507	0.00806	0.0128	0.0204	0.0324	0.0515	0.0820	0.130	0.207	0.329	0.524	0.833	1.32	2.11	3.35
Nichrome	0.0201	0.0320	0.0508	0.0808	0.128	0.204	0.325	0.516	0.821	1.30	2.08	3.30	5.25	8.35	13.3	21.1	33.6	53.4	84.9	135	214
Platinum	0.00196	0.00312	0.00496	0.00789	0.0125	0.0200	0.0317	0.0504	0.0802	0.127	0.203	0.322	0.513	0.815	1.30	2.06	3.28	5.22	8.29	13.2	20.9
Silver	0.000297	0.000472	0.000750	0.00119	0.00190	0.00302	0.00479	0.00762	0.0121	0.0193	0.0307	0.0487	0.0775	0.123	0.196	0.311	0.496	0.788	1.25	1.99	3.17
Tungsten	0.00099	0.00157	0.00250	0.00397	0.00631	0.0100	0.0159	0.0254	0.0403	0.0641	0.102	0.162	0.258	0.410	0.652	1.03	1.65	2.62	4.17	6.63	10.5

The wire diameter in mm follows the AWG number. AWG is often called Brown and Sharpe Gauge

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WIRE TABLES

TABLE 1. Resistivity in 10^-8 Ω m at the Indicated Temperature