The ornamental design for a coveringplate for electricalwiring, as shown and described.
1. Covering plate for electrical wiring
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
FIG. 1.1 is a front perspective view of a covering plate; FIG. 1.2 is a front view thereof; FIG. 1.3 is rear view thereof; FIG. 1.4 is a left side view thereof; FIG. 1.5 is a right side view thereof; FIG. 1.6 is a top view thereof; and FIG. 1.7 is a bottom view thereof; all broken lines represent unclaimed features of the article to which the design is applied.