Switchgear. An assembly completely enclosed on all sides
and top with sheet metal (except for ventilating openings
and inspection windows) and containing primary power circuit
switching, interrupting devices, or both, with buses and
connections. The assembly may include control and auxiliary
devices. Access to the interior of the enclosure is provided
by doors, removable covers, or both.
Informational Note: All switchgear subject to NEC requirements
is metal enclosed. Switchgear rated below 1000
V or less may be identified as ?low-voltage power circuit
breaker switchgear.? Switchgear rated over 1000 V may be
identified as ?metal-enclosed switchgear? or ?metal-clad
switchgear.? Switchgear is available in non?arc-resistant or
arc-resistant constructions.