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1. These resistance values are valid only for the parameters as given. Using conductors having coated strands, different stranding type, and, especially, other temperatures changes the resistance. 2. Equation for temperature change: R 2 = R 1 [1 + α (T 2 − 75)] where α cu = 0.00323, α AL = 0.00330 at 75°C. 3.
This Handbook is a revision of the Copper Wire Tables previously published as NBS Circular 31. It reflects changes in the nominal diameters of gages 45 and smaller and extends the tables to 56 gage. The changed diameters and extended range were established in 1961 by the Committee on Wires for Electrical Conductors of the American
Solid and stranded (classes AA and A) bare copper and suitable for overhead transmission and distribution applications. Stranded conductor of greater flexibility (class B and C) are suitable for uninsulated hook up, jumpers, and grounds in electrical construction.
Class 5 flexible copper conductors Class 6 extra flexible copper conductors Single-core & multi-core cables Nominal cross-section Max. diameter of wires in conductor Max. resistance of conductor at 20°C Class 5 Classe 6 Plain copper Tinned copper mm² mm mm Ω/km Ω/km 0,5 0,21 0,16 39,0 40,1 0,75 0,21 0,16 26,0 26,7 1,0 0,21 0,16 19,5 20,0 1 ...
Direct-Current Resistance at 750C (167 OF) Copper Size (AWG kcmil) 18 14 14 10 6 4 2 1/0 2/0 3/0 4/0 250 300 350 400 500 600 750 soo 900 1 ooo 1250 1500 1750 Area Circular Stranding Diameter Overall Aluminum Area Uncoated Coated mm 0.39 0.62 0.78 0.98 123 1.56 1.96 2.20 247 1.69 I .89 2.13 2.39 2.68 2.09 2.29 247 2.64 2.95 2.52 2.72 2.82 2.91 3.09
RC –Rope construction with Concentric stranded groups. Similar to concentric stranding for both the final stranding and each group. S – Solid wires. The maximum resistance values are for the wire as a single conductor. Additional allowances have to be made when the wires are cabled into a multi conductor cable. B 6 – Bunch 665/34 stranded wire.
TABLE 1 - 3 Resistance in Ohms per 1000 feet per Conductor at 20°C and 25°C of solid wire and Class B Concentric Strands Copper and Aluminum Conductors 3 TABLE 1 - 4 Copper and Aluminum Resistance-Temperature Correction Factors 4 TABLE 1 - 5 AC/DC Resistance Ratios - for Copper and Aluminum Conductors, 60 Hertz (65°C) 5
