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One is going to search for a proper electric energy meter is to determine what you're measuring. Is the monitored load signal-phase, split-phase or three-phase? What voltage / current ranges are going to be monitored?
If you're interested in a power meter for residential or light commercial applications, then typical a single or split-phase meter would be the best choice. These applications use around 120 to 240 VAC, and draw less current than three-phase applications. Three-phase meter can contain up to 480 BAC and can provide more than a single-phase power at the same current. Three-phase motors can range up to 480 BAC and can Handle current ranges of up to 5,000 Amps. Advanced meters will allow you to configure the voltage in the field using a broadband power supply.
