A new set of 2 electrical boxes and a meter found under Decor / MiscDecor, all cost 60. The 3 objects can be moved up the wall by pressing the key :/; (key to the right of the "L" key). You will need to use the cheat moveobjects on to place all 3 objects close to each other as per pictures below.
This set can also be used in CAW. If you want to use them in CAW, you need to place the packages also in the "The Sims 3 Create a World Tool/ Packages" folder. There is an earlier post explaining how to install items in CAW.
Importing packages into CAW
Electrical boxes and meter set