Ohe in Indian Railways N Dmrc

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Chapter-14

Comparative salient feature of OHE of DMRC & Indian Railway

15.1 IMPORTANT DMRC OHE PARAMETERS (Rail Corridor)

S.N.| Parameters| Specification as per DMRC| Specification as per Indian Railway| 1| Normal height of contact wire at support point for regulated OHE| 5.00 mtr (Presag -1000th part of span length)| 5.50 mtr| 2| Normal height of contact wire at support point for unregulated OHE| 5.15 mtr| 5.70 mtr| 3| Minimum height of contact wire at loco inspection pit| 5.20 mtr| 5.80 mtr| 4| Minimum height of contact wire at over line structure| 4.80 mtr| 5.50 mtr| 5| Dia of new contact wire| 13.8 mm| 12.24 mm|

6| Condemned dia of contact wire on main line| 9.25 mm| 8.25 mm| 7| Condemned dia of contact wire on loop lines/ yard lines| 9.00 mm| 8.00 mm| 8| Stagger of contact and Catenary wire on tangent track| ± 200 mm| ± 200 mm| 9| Stagger of contact and Catenary wire on curved track| ± 300 mm| ± 300 mm| 10| Gap between two parallel running contact wires at uninsulated overlap| 200 mm| 200 mm| 11| Gap between parallel running contact wires at insulated overlap| 500 mm| 500 mm| 12| Height of contact wire of turnout OHE above contact wire of main line OHE| 5 cm| 5 cm| 13| Track separation at turnout and crossover at the location of obligatory structure| 22 to 84 cm| 24 to 84 cm| 14| Minimum implantation at obligatory structure/ mast supporting more than one OHE| 3.00 mtr| 3.50 mtr| 15| Normal implantation ( Standard )| 3.60 mtr ( At Grade ), 2.87 mtr ( At Via Duct)| 2.50 mtr | 16| Minimum implantation on Gantry| 4.30 mtr| 3.75 mtr| 17| Normal encumbrance| 90 cm| 140 cm|

18| Maximum permissible slope of contact wire on main line| 3%| 3mm/mtr| 19| Maximum permissible slope of contact wire in yards| 10%| 5mm/mtr| 20| Short time minimum Vertical electrical clearance| 270 mm| 270 mm| 21| Short time minimum Horizontal electrical clearance| 220...
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