To calculate the nominal diameter of any concentric-lay-stranded conductor made from round wires of uniform diameters, multiply the diameter of an individual wire by the applicable factors listed below:
| Number of Wires in Conductor | Factor to Calculate Conductor Diameter |
|---|---|
| 3 | 2.155 |
| 7 | 3.000 |
| 12 | 4.155 |
| 19 | 5.000 |
| 37 | 7.000 |
| 61 | 9.000 |
| 91 | 11.000 |
| 127 | 13.000 |
| 169 | 15.000 |
| 217 | 17.000 |
| 271 | 19.000 |
For a greater number of wires use the formula:
| Conductor Diameter = Wire Diameter x SQRT (1.332 x No. of Wires) |
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