The purpose of a Power Tee on a NMEA 2000 Backbone is:

• A. To shield RF
• B. To insert power into the backbone
• C. To terminate the bus
• D. To convert signal levels

Answer: (B)

The main idea is that the backbone needs a power source, and a Power Tee provides a convenient way to inject that power onto the NMEA 2000 network. The backbone carries data over the CAN pair and also needs a 12-volt (or vehicle supply) supply to run devices connected to the bus. A Power Tee ties the system’s power supply into the backbone so every node along the trunk can draw power from the same source. This keeps powered devices on the network energized without needing separate power adapters for each one. It isn’t used for RF shielding, bus termination, or converting signal levels—the terminators handle ends of the CAN bus, and the CAN transceivers handle voltage levels.