Trace Spacing
| Conductor Spacing | |||||||
| Voltage Between Conductors (VDC or Peak) | Minimum Spacing (inches) | ||||||
| Bare Board | Assembly | ||||||
| B1 | B2 | B3 | B4 | A5 | A6 | A7 | |
| 0 thru 15 | .004 | .025 | .025 | .005 | .005 | .005 | .005 |
| 16 thru 30 | .004 | .025 | .025 | .005 | .005 | .010 | .005 |
| 31 thru 50 | .004 | .025 | .025 | .005 | .005 | .015 | .005 |
| 51 thru 100 | .004 | .025 | .060 | .005 | .005 | .020 | .005 |
| 101 thru 150 | .008 | .025 | 125 | .015 | .015 | .030 | .015 |
| 151 thru 170 | .008 | .050 | .125 | .015 | .015 | .030 | .015 |
| 171 thru 250 | .008 | .050 | .250 | .015 | .015 | .030 | .015 |
| 251 thru 300 | .008 | .050 | .500 | .015 | .015 | .030 | .015 |
| 301 thru 500 | .010 | .100 | .500 | .030 | .030 | .060 | .030 |
| More than 500 | .0001 /Volt | .0002 /Volt | .001 /Volt | .00012 /Volt | .00012 /Volt | .00012 /Volt | .00012 /Volt |
B1 - Internal Conductors
B2 - External Conductors, uncoated, sea level to 10,000 ft.
B3 - External Conductors, uncoated, over 10,000 ft.
B4 - External Conductors, with permanent polymer coating (soldermask).
A5 - External Conductors, with conformal coating over assembly.
A6 - External Component lead/termination, uncoated.
A7 - External Component lead/termination, with conformal coating.
