[SI-LIST] Re: copper-to-copper separation

,
        The spec this came from has been superceded by IPC-2221,
        available through http://www.ipc.org . It is at least
        useful for order of magnitude and really hasn't changed
        much in the >31 volts values.

-------------------------------------------------------------------------
This is from ANSI/IPC-D-275.

Voltage                         Spacing (FR4)
                B1      B2      B3      B4      A5      A6      A7
0-15            0.1mm   0.64mm  0.64mm  0.13mm  0.13mm  0.13mm  0.13mm
16-30           0.1mm   0.64mm  0.64mm  0.13mm  0.13mm  0.25mm  0.13mm
31-50           0.1mm   0.64mm  0.64mm  0.13mm  0.13mm  0.38mm  0.13mm
51-100          0.1mm   0.64mm  1.5mm   0.13mm  0.13mm  0.5mm   0.13mm
101-150         0.2mm   0.64mm  3.18mm  0.38mm  0.38mm  0.75mm  0.38mm
151-170         0.2mm   1.27mm  3.18mm  0.38mm  0.38mm  0.75mm  0.38mm
171-250         0.2mm   1.27mm  6.4mm   0.38mm  0.38mm  0.75mm  0.38mm
251-300         0.2mm   1.27mm  12.7mm  0.38mm  0.38mm  0.75mm  0.38mm
301-500         0.25mm  2.54mm  12.7mm  0.75mm  0.75mm  1.5mm   0.75mm
>500            0.0025mm/V      0.0254mm/V      0.00305mm/V     0.00305mm/V
>500                    0.005mm/V       0.00305mm/V     0.00305mm/V

B1      Internal Conductors
B2      External Conductors, uncoated, sea level to 10,000 feet
B3      External Conductors, uncoated, over 10,000 feet
B4      External Conductors, with permanent polymer coating
A5      External Conductors, with conformal coating over assembly
A6      External Components lead/termination uncoated
A7      External Components lead/termination with conformal coating
--------------------------------------------------------------------------

        Regards,
-- 
 
      Jeff Seeger                         Applied CAD Knowledge Inc
      Chief Technical Officer                  Tyngsboro, MA  01879
      jseeger "at" appliedcad "dot" com                978 649 9800
        President, Greater Boston Chapter, IPC Designer's Council
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