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Figure 18    4-Wire Delta System
Wiring Schemes And Grounding Summary

Electrical Science Volume 4 of 4
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Electrical Distribution Systems WIRING SCHEMES AND GROUNDING In Figure 19, an example of the Wye system, or center-grounded Wye as it is commonly referred to, extends three current-carrying insulated conductors and an insulated grounded neutral to the loads.   Depending on the selection of conductors, one of the following is available:   a reduced- voltage  single  phase  between  a  phase  leg  and  the  neutral;  a  full-voltage  single-phase  circuit between any two phase legs; or a full-voltage three-phase power.  Again, some precautions must be  taken  when  balancing  the  single-phase  loads  in  the  system.   The  full  load  ampacity  of  the neutral must be sized to 1.73 times the highest phase ampacity.   This is done to avoid either an over-current  condition  if  a  fault  is  present  or  the  operation  of  single-phase  loads  at  reduced voltage if the loads become severely unbalanced by accidental interruption. Figure 19    4-Wire, Three-Phase Wye System As with all other grounded systems, bonds are established between the grounded neutral and all components  of  the  system.    This  system  is  recognized  as  the  safest  possible  multi-purpose distribution  system  for  low  voltage  and  is  commonly  seen  in  the  208/120-volt  range  in  many facilities. Summary The important information in this chapter is summarized on the following page. Rev. 0 Page 27 ES-15







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