What is a 4" square box with eccentric knockouts suitable for?

A 4" square box with eccentric knockouts is primarily designed for holding switches and outlets. These boxes provide a secure and organized way to mount electrical devices, offering enough space for their wiring. The eccentric knockouts allow for flexible conduit connections that can be positioned to optimize space and fit various installation scenarios, making it ideal for accommodating switches and outlets in residential or commercial electrical systems.

This type of box is not intended for supporting fixtures, as its primary function is to house electrical devices rather than take on the load of hanging fixtures. While it does protect wires within walls to a certain extent by containing the wiring and connections, that is not its primary purpose compared to the specific function of holding devices. Lastly, a 4" square box does not serve any structural reinforcing purpose in buildings; its design and application focus solely on electrical installations.