Isolated-Phase Bus Enclosure Currents

In the continuous-enclosure type isolated-phase bus, the enclosure current in amperes is very nearly equal to the conductor current. It lags the conductor current by somewhat less than 180°. The external flux is relatively small, and any induction heating in material or induced volts in instrument or control circuits adjacent to the bus will be negligible. Methods for determining the actual current in the enclosure and the external magnetic field are developed in this paper.