Which type of screw is permitted for attaching receptacles to a box?

The use of a 6-32 machine screw for attaching receptacles to a box is standard practice because this specific size provides the right balance of strength and compatibility with the threading of most electrical boxes and receptacle devices.

The 6-32 designation indicates a screw with a #6 diameter and 32 threads per inch, which allows for a secure fit without being excessively large or too small. This helps in maintaining the stability of the receptacle when mounted, ensuring it is properly secured to avoid any potential issues with connectivity or physical displacement.

Attachment using the correct type of screw is crucial for electrical safety and performance, as it ensures that receptacles remain securely fastened, which is important for both safety and functionality.