The job I am currently on has a primary feed from a "substation" to a 600 amp disc feeding a 300KVA delta/wye transformer. The line drawing shows a "slug" fuse in the B phase of the disconnect and the B phase of the primary tap (delta side)on the transformer grounded? I do not understand this and it puzzles me as to how it works this way. The maintenance folks at this plant say they do it all the time????
signed
confused
signed
confused