Aerial insert
Encyclopedia : A : AE : AER : Aerial insert
In a direct-buried or underground cable run, an aerial insert is a cable rise to a point above ground, followed by an overhead run, e.g. on poles, followed by a drop back into the ground. An aerial insert is used in places where it is not possible or practical to remain underground, such as might be encountered in crossing a deep ditch, canal, river, or subway line.
Source: From Federal Standard 1037C
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