What is the standard size of knockouts found on a 4" square box?

The standard size of knockouts found on a 4" square box is typically 1/2" and 3/4". This is important for electricians to know as these knockouts allow for the connection of conduit and cables to the electrical box. The 1/2" knockout is commonly used for connecting with smaller conduit sizes, while the 3/4" knockout accommodates larger conduit. By understanding the standard sizes, electricians can ensure compatibility with fittings and wiring methods, facilitating proper installations and compliance with electrical codes.

In contrast, other options provided may include sizes that are not standard for a 4" square box, making them less applicable for most electrical installations.