Which of the following items is typically found on a riser diagram in commercial prints?

The item that is typically found on a riser diagram in commercial prints is conduit sizes. A riser diagram serves to illustrate the vertical organization of electrical systems, showing how different components of the system relate to each other in a vertical layout. Conduit sizes are crucial on these diagrams, as they indicate the dimensions and specifications of the pathways that electrical conductors will follow. This information is essential for installers to ensure that they select the correct conduit type and size to accommodate the wiring, meet installation codes, and ensure safety.

Understanding conduit sizes in the context of a riser diagram helps electricians and engineers plan for proper system installation and integration within the building's infrastructure. The inclusion of this information assists in visualizing the overall design and functionality of the electrical system as it ascends through various floors, connecting different points of the system.

The other options, while important in their own contexts, do not specifically belong to a riser diagram. Main level drawings are more associated with layout plans rather than the vertical components of electrical systems, site conditions involve the external factors affecting a construction site that would be represented elsewhere, and floor elevations pertain more to the overall structure than to the specific vertical arrangements of electrical systems.