Which of the following screw types is used for mounting a cover on Box I?

The use of an 8-32 screw type for mounting a cover on a box is common because it provides a good balance between strength and the ease of assembly. The "8" in 8-32 refers to the screw's size, and the "32" indicates the number of threads per inch. This specific screw size is typically utilized for securing covers on standard junction or electrical boxes, ensuring that the cover remains securely attached while allowing for efficient assembly and disassembly when necessary.

Understanding the application of screw sizes in electrical installations is essential for ensuring safety, durability, and compliance with relevant codes. Each screw size has its unique applications and is specified for particular mounting tasks to accommodate varying thicknesses of materials and required strength. In this context, the 8-32 screw's widespread use in electrical box covers aligns with common industry practices.