... round meter base 100Amps,120~240VAC, Single phase,4 terminal,2 or 3 wire,Fix hub size:1/2",3 ... terminals,2 or 3 wire Copper Jaw,Copper or aluminum connector•The Die-cast Aluminium enclosure.Electrostatically applied epoxy and ... current carrying parts are made of phosphor copper.•The ground connector is designed to in sure a positive electrical connection ... ringFix hub size:1/2,3/4,1, meter socket