Wires aren't the only components you need to worry about when calculating box fill. You also need to consider the volume of any conductors, clamps, support fittings, devices, equipment, and grounding ...

Conductor damage during installation is one consequence of under sizing junction and pull boxes. This damage is often not apparent until post-installation cable testing. Then, after the boxes are ...

So you go through all that work to correctly size your raceway, only to find out during the acceptance inspection that you have to replace some boxes and re-pull all of the conductors. The client’s ...