3-phase at a panelboard. The 480V primary overcurrent protective device (OCPD) is either a thermal magnetic breaker or a set of fuses. It’s also common to see a main breaker for a secondary OCPD (main ...

The typical wiring arrangement is to have a 480V, 3-phase, general-purpose contactor located in an ... The transformer — and subsequently the lighting panelboard downstream — can then be switched off ...