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:

Bodies of electrically non-conducting material used for keeping charged conductors from contact with each other or from grounding and often also for supporting them. Usually refers to objects of glass or porcelain that support telephone or power lines, but that do not carry current.