How to Install an Electrical Outlet Receptacle Installing or fixing an electrical outlet can be a very easy job when it involves the simple replacement of an existing receptacle,but it can be a bit more difficult if it involves running a new circuit from the main service panel or extending an existing circuit.The following instructions show how to connect the receptacle when the electrical box has already been installed and when the necessary NM electrical cables have been run in the wall cavities. Installing a new outlet exactly where you need it will increase convenience and reduce unsightly and dangerous extension cords.All the materials necessary to install a new outlet cost less than $10 and installation will take approximately 30 minutes to an hour depending on the distances and obstacles within the walls. Electrical Outlet Types Installed by Mr. Electric.You have a lot of options to choose from for your new outlet installation. Here is a sampling of the electrical outlet types Mr.Electric installs in homes and businesses every day: Ground Fault Circuit Interrupter (GFCI) Outlets–GFCIs protect people from electric shock by sensing abnormal current flow and stopping electricity from flowing to the outlet.