Ohms per inch of closed helix
| Wire Size No. B & S | Outside Diameter of Helix in Inches | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/4 | 5/8 | 1/2 | 3/8 | 1/4 | 7/32 | 3/16 | 5/32 | 1/6 | 3/32 | 1/16 | 1/32 | |
| 14 | .446 | .365 | .283 | .202 | .121 | .101 | ||||||
| 15 | .638 | .523 | .408 | .293 | .178 | .148 | .120 | |||||
| 16 | .895 | .735 | .575 | .415 | .255 | .215 | .175 | .135 | ||||
| 17 | 1.32 | 1.08 | .851 | .617 | .383 | .325 | .266 | .208 | .150 | |||
| 18 | 1.89 | 1.56 | 1.22 | .891 | .559 | .475 | .392 | .309 | .226 | |||
| 19 | 2.60 | 2.14 | 1.69 | 1.23 | .779 | .665 | .551 | .438 | .324 | |||
| 20 | 3.72 | 3.07 | 2.42 | 1.78 | 1.13 | .967 | .805 | .644 | .482 | |||
| 21 | 4.53 | 3.58 | 2.63 | 1.68 | 1.45 | 1.21 | .971 | .733 | .496 | |||
| 22 | 4.98 | 3.67 | 2.36 | 2.03 | 1.70 | 1.37 | 1.05 | .719 | ||||
| 23 | 7.02 | 5.18 | 3.34 | 2.88 | 2.42 | 1.96 | 1.51 | 1.05 | ||||
| 23 | 7.02 | 5.18 | 3.34 | 2.88 | 2.42 | 1.96 | 1.51 | 1.05 | ||||
| 24 | 4.69 | 4.05 | 3.41 | 2.78 | 2.14 | 1.60 | .865 | |||||
| 25 | 6.87 | 5.94 | 5.02 | 4.10 | 3.17 | 2.25 | 1.32 | |||||