Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. system components
7. electrical system components

Anotations

Scope note:

Large panels, frames, or other assemblies on which are mounted switches, fuses, instruments, and protective devices; for smaller panels containing switches and fuses or circuit breakers, use "panelboards."