FOXBORO P0400ZE I/O module

A circular mill is a unit of area equal to the area of a circle whose diameter is one mil (1 mil = 0.001-6 inch).The dividing line between the lower and higher frequency should be high enough to include all audio communications signals. Since digital systems employ frequencies, which extend from dc up to several hundred MHz, a decision based on pulsed-signal considerations is more appropriate.

kcmil – One thousand circular mils. 

To minimize the possibility that the ground bus conductors will form antennas; the lengths should not exceed 0.02 wavelength which is approximately 21 meters (70 feet) at 300 kHz. Since the grounding buses in medium to large sized facilities may extend 21 meters (70 feet), 300 kHz appears to be the maximum frequency for which a single-point grounding system should be used.

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