VRIOGS 010.7 RevA - Public Transport Victoria

VRIOGS 010.7 Revision A 4310.4 Dual Gauge Track Bonding1. Traction type bonding for common rails and non-common rails; on dual gaugetrack layouts shall be by a pin brazing or similar Infrastructure Managerapproved method, utilising two 35 mm 2 copper type bonds for eachconnection.2. NON Traction type bonding for common rails and non-common rails; on dualgauge track layouts shall be by a pin brazing or similar Infrastructure Managerapproved method, utilising two 6 mm 2 copper type bonds for each connection.3. Track leads at the feed end of the track circuit shall be arranged such that theactual track connections are to the common rail and to the outer rail. (toensure integrity of the bonding between the non common broad and standardgauge rails)4. Track leads at the relay end of the track circuit shall be arranged such that theactual track connections are to the common rail and to inner rail (to ensureintegrity of the bonding between the non common broad and standard gaugerails).5. Bonding wires/cables between the two outer rails shall be connected fromouter rail web to outer rail web and of a length such that they are only longenough to cater to being flexible for rail expansion and yet not long enough tobe damaged by track machinery.6. Bonding for non-common rails; on dual gauge track layouts shall be inaccordance with this specification or an approved Infrastructure Managermethod, and spaced at:• No greater than 15 m intervals where points and crossing areas areencountered;• No greater than 100 m where straight track areas are encountered and witha minimum of four bonded locations per track circuit.10.5 Electrified Area1. Connections to rail shall be installed using the following method;• The rail web shall be drilled with a No. 19 drill (7/8" diameter) and holesize checked with the GO/NO GO gauge.• Immediately the hole has been drilled, the copper bush shall be insertedwith the flange on the side of the rail to which the connection shall bemade.• The bush shall then be expanded by means of the special hydraulic toolwhich draws a conical headed plunger through the bush causing the bushto be expanded and extruded to form a permanent contact with the rail.• A hollow healed hexagon bolt shall be inserted through the bush so thatthe threaded portion projects from the bush flanged side. The stud headsurrounds the projecting part of the bush without touching it.NOTE: This document is controlled only when viewed on the DOT Engineering Standards website.Any other copy of this document is uncontrolled, and the content may not be current.