FIG. 1 is a front elevation view of an electrical connecting socket showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof; and,

FIG. 7 is an isometric view thereof.

The broken lines in the drawings depict environmental structure, which forms no part of the claimed design.