The maximum voltage drop allowed from the battery source to the power insertion point is:

The maximum voltage drop allowed from the battery source to the power insertion point is:

• A. 1%
• B. 2%
• C. 5%
• D. 3%

Answer: (D)

Voltage drop along the power path reduces the voltage actually reaching each NMEA 2000 device. To keep devices operating reliably on a 12-volt marine network, the spec limits how much of the supply can be lost between the battery and where power is injected into the backbone. That limit is 3% of the nominal voltage. So on a 12-volt system, about 0.36 V may be dropped; on a 24-volt system, about 0.72 V. This keeps the voltage at devices within their acceptable range despite cable resistance, connectors, and current draw from multiple devices. A smaller percentage would require heavier wiring; a larger percentage could cause under-voltage issues affecting performance and communication. Hence the maximum is 3%.

Voltage drop along the power path reduces the voltage actually reaching each NMEA 2000 device. To keep devices operating reliably on a 12-volt marine network, the spec limits how much of the supply can be lost between the battery and where power is injected into the backbone. That limit is 3% of the nominal voltage. So on a 12-volt system, about 0.36 V may be dropped; on a 24-volt system, about 0.72 V. This keeps the voltage at devices within their acceptable range despite cable resistance, connectors, and current draw from multiple devices. A smaller percentage would require heavier wiring; a larger percentage could cause under-voltage issues affecting performance and communication. Hence the maximum is 3%.