2.7.1 the Panel switch auto-excerpt is a type of electrical system 3-phase Dead-Front used with 4-wire 380/220 volt bus bar insulation voltage must endure at least 415 volts.
2.7.1 The panel switches automatically extracts a type Dead-Front with 380/220 volt electrical system, 3-phase, 4-wire bus bar insulation withstand voltage must be no less than 415 volts.
2.7.1 panel switch and automatically is a kind Dead-Front used to power system 3 phase 4 line 380 / 220 voltage bus bar insulation must endure voltage with no less than 415 volts.