The screw holes for mounting a cover on Box I are tapped for which size screws?

The mounting holes for a cover on an electrical box are typically tapped for 8-32 screws. This specification means that the screws have a diameter of size 8 and 32 threads per inch. This size is commonly used in the electrical industry for securing covers to various types of electrical enclosures, including outlet and junction boxes.

Using the proper screw size is essential to ensure a secure fit and proper alignment of the cover with the box. If a different size screw, such as 10-32, 6-32, or 12-24, is used, it could lead to improper installation, potentially affecting the protection and functionality of the box, as well as compliance with relevant safety codes and regulations. In contrast, the 8-32 size is standardized and provides the necessary strength and stability for these applications.