To start, mix a setting compound and carefully apply it between the electrical box and the wall, taking caution around the metal blade. This step-wise guide illustrates the method to achieve a seamless finish around the electrical outlets and switches, even for larger holes. Whether you're remodeling, adding a new light switch, or replacing old wiring, this DIY electrical guide walks you through each step clearly — from cutting into drywall to mounting the electrical box and running wires cleanly. This tutorial is perfect for beginners and intermediate DIYers looking. For distribution boxes that handle only lighting circuits or small power loads, if the incoming wire size is less than 10 square millimeters and the number of circuit switches is fewer than 20, the width of the box should be calculated by summing the width of the switches and adding an additional. Determine wall switch box mounting location based on wall construction, 1 applicable standards and intended use. In high use and abuse areas, a solid mounting surface or additional reinforcement may be required behind the box. It takes the incoming power and safely distributes it to different circuits throughout your building. However, the key to. In this tutorial episode, viewers will learn how to repair overcut or damaged drywall around an electrical outlet box, ideal for DIY beginners.