RCDD · Question #272
The MAXIMUM span length for an aerial entrance, from the last pole to the building, must NOT exceed:
The correct answer is B. 30 m (100 ft). BICSI limits the maximum aerial entrance span from the last pole to the building to 30 m (100 ft) to control cable sag, tension, and mechanical stress.
Question
The MAXIMUM span length for an aerial entrance, from the last pole to the building, must NOT exceed:
Options
- A15.2 m (50 ft)
- B30 m (100 ft)
- C45.8 m (150 ft)
- D61 m (200 ft)
- E76 m (250 ft)
How the community answered
(19 responses)- B84% (16)
- C11% (2)
- E5% (1)
Why each option
BICSI limits the maximum aerial entrance span from the last pole to the building to 30 m (100 ft) to control cable sag, tension, and mechanical stress.
15.2 m (50 ft) is below the actual maximum and would unnecessarily restrict aerial installations that can safely reach 30 m.
The BICSI TDMM specifies that aerial entrance spans from the last supporting pole to the building must not exceed 30 m (100 ft). Spans beyond this distance create excessive cable tension and sag, which can damage the cable sheath and internal conductors over time. If the distance exceeds 30 m, an additional pole or support structure must be installed to stay within this limit.
45.8 m (150 ft) exceeds the BICSI maximum span limit and would result in unacceptable sag and mechanical stress on the aerial cable.
61 m (200 ft) greatly exceeds the 30 m maximum and would create dangerous levels of cable tension and potential structural failure.
76 m (250 ft) is more than double the permitted maximum span and is not a compliant aerial entrance configuration per BICSI standards.
Concept tested: Maximum aerial entrance span length outside plant
Source: https://www.bicsi.org/standards/published-ansi-bicsi-standards
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