Which of the following is true about a device with LEN of 5?

Which of the following is true about a device with LEN of 5?

• A. It draws 500 mA
• B. It draws 250 mA
• C. It draws 125 mA
• D. It draws 50 mA

Answer: (B)

LEN stands for Load Equivalency Number. In NMEA 2000, each LEN represents a 50 mA draw on the 12V network. So a device with LEN 5 uses 5 × 50 mA = 250 mA. The other currents would correspond to different LEN values (10 LEN would be 500 mA, 1 LEN is 50 mA, and 125 mA isn’t a multiple of 50 mA, which wouldn’t match a whole-number LEN). This LEN system helps size the bus power by summing the LENs of all devices to stay within the network’s power budget.

LEN stands for Load Equivalency Number. In NMEA 2000, each LEN represents a 50 mA draw on the 12V network. So a device with LEN 5 uses 5 × 50 mA = 250 mA. The other currents would correspond to different LEN values (10 LEN would be 500 mA, 1 LEN is 50 mA, and 125 mA isn’t a multiple of 50 mA, which wouldn’t match a whole-number LEN). This LEN system helps size the bus power by summing the LENs of all devices to stay within the network’s power budget.