When making concentric bends in conduit of different sizes, the first step in calculating the radius of a bend is to__________________.

Calculating the radius of the innermost bend is essential when making concentric bends in conduit, as it establishes the baseline for the entire bending process. The innermost conduit dictates the structural integrity and spacing of the other conduits that will be bent around it. By determining the radius of the innermost bend first, you can ensure that the bends of larger conduits follow appropriate spacing and maintain the necessary distance to avoid interference.

This radius affects the overall layout, ensuring that the outer conduits are bent in a way that accommodates not just their physical dimensions, but also the required clearance and protection against any potential kinks or compression that can happen if the bends are too close or awkwardly positioned.

The focus on the innermost conduit is crucial because it serves as the foundation of the concentric arrangement, making sure all subsequent bends align properly concerning bend allowances, which are necessary for proper installation.