In this paper, parallel interconnection of

-port networks without transformers is considered, and a necessary and sufficient condition is given, under which the short-circuit admittance matrix (

matrix) of the resultant

-port is equal to the sum of

matrices of the component

-ports. The given condition applies to nonsingular

-port networks containing a finite number of linear, lumped, and reciprocal R, L, and C elements. A possible application of the results to the RLC

-port synthesis problem is indicated.