The wall cavity I would like to put my thimble also has an electric outlet, what is the install specs on this? Can it be done safely? I was planning on running my pipe up that wall inside and out the thimble at the top of the wall (not at bottom near outlet box). If the romex has been stapled to the left side of the 2x4 would it be OK to install the thimble towards the right side of the same cavity?