DO NOT EXCEED 347V Line to Neutral of 600V line to line.
This meter is equipped to monitor loads up to 347 V L-N. Exceeding this voltage will cause damage to the meter and danger to the user. Always use a Potential Transformer (PT) for voltages in excess of 347V L-N or 600V line to line. The Setra Power Meters are 600V Over Voltage Category III device.