What is the minimum cross-section of a wood brace used for supporting a box for structural mounting?

The minimum cross-section for a wood brace used to support a box for structural mounting, according to the National Electrical Code, is indeed 1 inch x 2 inch. This dimension ensures that the brace is capable of safely supporting the weight of the electrical box and any connected wiring or devices without risking structural failure.

Using a brace that meets this minimum standard provides sufficient strength and stability for typical installation scenarios, which reduces the potential for issues such as warping or bending under load. The specifications are designed with safety in mind, ensuring that the installation can withstand typical stresses encountered in electrical applications.

While other options might provide a larger cross-section capable of more structural support, they exceed the minimum requirements set by the NEC. The rationale behind adhering to the specific minimum is to maintain consistency, efficiency, and safety in electrical installations, preventing overly rigid or unnecessarily robust supports that could complicate the installation process without significant benefit.