FOXBORO P0400YG Industrial control DCS system

conductor lengths up to 210 meters (700 feet) can be approached without exceeding the 0.02 wavelength criteria. MIL-STD-188-124B establishes the lower frequency network range from dc to 30 kHz and in some cases (depending on the interface frequency) up to 300 kHz. The higher frequency network range extends above 300 kHz and may in some cases be used at sites where the interface frequencies are as low as 30 kHz. The frequency range from 30 kHz to 300 kHz is a mutual area and may be considered as either higher or lower depending upon the interface frequency.

At frequencies up to 30 kHz

The lower frequency grounding network is defined as the range from 0-30 kHz, and in some cases up to 300 kHz. The lower frequency grounding network for the facility should conform to the following principles: (a) It should be isolated from other ground networks including structural, safety, lightning and power grounds, etc.

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