The ornamental design for an expansiondevice for energymeter, as shown and described.
FIG. 1 is a perspective view of front, top and right side of the expansion device for energy meter showing our new design;
FIG. 2 is a perspective view of rear, bottom and left thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown are included for the purpose of illustrating the unclaimed portions of the expansion device for energy meter and form no part of the claimed design.