For the parallel operation of two or more D.C. compound generators, we should ensure that_______________?

A. polarity of incoming generator should be same as that of bus bar

B. series fields of all generators should be either on positive side or negative side of the armature

C. all the series fields should be run in parallel by means of equilizer connection

D. all conditions mentioned above should be satisfied

E. voltage of the incoming generator should be same as that of bus bar

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