Explain the following - 1) Encumbrance 2) Span length.

Explain the following - 1) Encumbrance 2) Span length.
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Answer :

Encumbrance: It is the axial distance between catenary and contact wire. Its value is maintained at 1.4 m as per rules except at i) Turn outs, ii) Overlaps iii) In the vicinity of over line structure. 


Span length: It is the distance between two adjacent traction mats, generally this distance is in multiples of 4.5 m and vary from 27 m to 72 m. This can be facilitates the erection of OHE with standard dropper length and avoid mistake in erection. The span length 72m as per standard, which allows eight droppers at the spacing of 9m from each other. The span length depends various factors like: i) Wind pressure ii) Curvatures iii) Current collection point of view etc.

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