Book - School of Science and Technology

Electrical supply to storage equipment and installations 143for four-wire AC three-phase at 415 volt between phases (240 volt phase to neutral), loadbalanced, the current would be the same as with the three-wire system, no currentflowing in the neutral.In the case of a number of small heaters, each will be served from a separate way on thedistribution board. Having established the current flowing in the circuit supplying oneheater, these are totalled up to give the current supplied by the main to the distributionboard. From these currents the electrical distribution system is then designed. For a morecomplete study, reference should be made to one of the many textbooks on electricalengineering.