WNB or WNC Voltage Ranges and Power Supply

WattNode^® electric meters are available in seven different voltage range models. Each model handles different electrical service types and voltages, so you must be sure to choose a WattNode model that matches the service voltages you are measuring. All current WattNode models have either “3D” or “3Y” in the model number. This determines if the meter is powered line-to-line (3D) or line-to-neutral (3Y). WattNode meters are powered from the same line voltage connections (green screw terminal block) that sense the line voltage for power measurements. All models can measures single-phase or three-phase electrical systems using 1, 2, or 3 current transformers (CTs). See the Electrical Service Types and Voltages page for information on different types of services. The power supply voltage range is typically -20% to +15% of the nominal voltage (see table below). For 3D-240 meters, this is -20% of 208 Vac (166 Vac) to +15% of 240 Vac (276 Vac). The following table lists the different WattNode models, the nominal line-to-neutral and line-to-line voltage, the operating voltage range of their power supplies (in practice, WattNode meters will operate somewhat below the rated minimum voltage), the power supply voltage input terminals, and the maximum power draw of the meter.