Which type of fitting would you use to attach conduit securely to a wooden surface?

Using a conduit strap is the most effective and appropriate choice for securely attaching conduit to a wooden surface. Conduit straps are specifically designed to hold conduit tightly against surfaces, ensuring that the conduit remains in place and is supported adequately. They come in various sizes and materials to accommodate different types of conduit and can be fixed into the wood using screws.

Other options might serve specific purposes but do not fulfill this function as effectively. For example, a lock nut and bushing are commonly used for securing conduits to enclosures and protecting wires, rather than directly providing support to a conduit on a wooden surface. A condulet focuses on making junctions between conduits rather than securing them to surfaces. Meanwhile, a straight connector is used to join two pieces of conduit together but does not provide fastening to a surface. Therefore, in this case, the conduit strap is the best choice for ensuring a stable and secure installation on a wooden surface.