Overcurrent protection devices (OCPDs) need protection, too. Not from overcurrent, but from physical damage [240.30(A)]. You can provide that protection in one of two ways:
1. Put them in something: an enclosure, cabinet, cutout box, or equipment assembly.
2. Mount them on something: open-type switchboards, panelboards, or control boards.
The second option is available only if what you’re mounting the OCPD on is:
1. In a room or free from dampness and ign