Using Lite Cable with LEN 8 and Backbone Length 4 meters, what is the voltage drop?

Using Lite Cable with LEN 8 and Backbone Length 4 meters, what is the voltage drop?

• A. 0.018 volts
• B. 1.8 volts
• C. 0.081 volts
• D. 0.18 volts

Answer: (D)

Voltage drop on a NMEA 2000 backbone comes from the current drawn by all devices on that backbone multiplied by the resistance of the backbone conductors over the path. For Lite Cable with LEN 8 over a 4 meter backbone, the total loop resistance is about 0.18 ohms. The current on a LEN 8 backbone of this length yields a drop of roughly 0.18 volts. This keeps the voltage seen by devices close to the nominal supply while staying within typical network limits. The other values would require a much larger loop resistance or a larger current than this setup provides, so they don’t match what’s produced by this configuration.

Voltage drop on a NMEA 2000 backbone comes from the current drawn by all devices on that backbone multiplied by the resistance of the backbone conductors over the path. For Lite Cable with LEN 8 over a 4 meter backbone, the total loop resistance is about 0.18 ohms. The current on a LEN 8 backbone of this length yields a drop of roughly 0.18 volts. This keeps the voltage seen by devices close to the nominal supply while staying within typical network limits. The other values would require a much larger loop resistance or a larger current than this setup provides, so they don’t match what’s produced by this configuration.