We claim the ornamental design for an electrical box, as shown and described.
FIG. 1 is a perspective view of an electrical box showing our design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left elevational view thereof;
FIG. 5 is a right elevational view thereof;
FIG. 6 is a top elevational view thereof; and,
FIG. 7 is a bottom elevational view thereof.
The broken lines in the drawings are for the purpose of illustrating environmental subject matter and portions of the electrical box that form no part of the claimed design.