The maximum current in any backbone leg using Heavy Cable is 8 amps.

The maximum current in any backbone leg using Heavy Cable is 8 amps.

• A. 4 amps
• B. 6 amps
• C. 8 amps
• D. 10 amps

Answer: (C)

In NMEA 2000 networks, power on the backbone is shared along the trunk by a heavy cable, and there’s a defined limit to how much current any backbone leg can carry to keep heating and voltage drop within safe levels.That limit is eight amps, so the total current drawn from devices on that trunk segment must not exceed eight amps. If your loads are smaller, the current will be less; pushing ten amps would violate the standard and risk overheating.

In NMEA 2000 networks, power on the backbone is shared along the trunk by a heavy cable, and there’s a defined limit to how much current any backbone leg can carry to keep heating and voltage drop within safe levels.That limit is eight amps, so the total current drawn from devices on that trunk segment must not exceed eight amps. If your loads are smaller, the current will be less; pushing ten amps would violate the standard and risk overheating.