... system. Assorted with transformers, voltage dividers, shunts, etc, the meter can realize the overall management functions of three- phase voltage, current and ... , open a 87mm × 87mm square hole;n Remove out the meter into a Pre-Opened hole from front to back;n ... two install clamps along both sides of the groove of meter from back, and tighten the screws the clamps have attached. ( function(){ var ...