PR S 40002 Flashcards
Temporary bridging
When is temporary bridging allowed
to minimise disruption to rail traffic or users of level crossings when signalling equipment becomes damaged, disconnected or disarranged
What must be considered for temporary bridging
The protection defeated is provided by an alternative means. Adequate testing is conducted to prove effectiveness of the portion of circuit to remain unbridged.
What contacts can be bridged
Generally confined to position indication or detection contacts of trackside equipment.
Trainstop protection
A trainstop protecting a series of suppressed trainstop must remain in the stop position
what part of the equipment is bridged
Bridging is generally applied to the removed or failed portion of equipment.
Where is the ideal location for bridging
To be applied as close as possible to the affected equipment. This includes the bridging authority form and accompanying circuit diagram
What must be done to the opposite part of the circuit that is bridged
The opposite of the bridged circuit must be disconnected, for example If the Normal detection is bridged the Reverse detection must be disconnected.
What documentation is required for bridging and any additional documentation for planned works
Infrastructure Booking Authority NRF 003, PR S 40002 FM01, Marked up circuit diagram. A package with work instructions is required for planned works
How long can bridging be left in
16 weeks. Any longer and you need authority from the authorising engineer, the maintenance signal engineer and the Principal engineer signalling integrity
Prior to bridging, what is discussed in the briefing with the signal engineer and the person applying/removing the bridging
The bridging arrangements, alternate protection, testing requirements, and notification arrangements.
What needs to happen if the works cannot be completed in time
The authorising signal engineer must be contacted and a request for a time extension must be approved.
Can an engineer give verbal approval
Yes, they can. However it must be to an independent licensed signalling person who will transcribe the engineers instructions and write the name of the engineer on the form until a signature can be obtained
If the bridging is left unattended, what must be left with it.
A copy of the temporary bridging form PR S 40002 FM01 and the circuit diagram.
What do you need to do with the paperwork once the bridging is finished
You must fill in all required areas on the form, notify the authorising signal engineer and send a copy of the documents to the authorising signal engineer. He will then inspect and sign, then forward a copy to the maintenance signal engineer.
What needs to be on the circuit diagram
Temporary bridging for ___ Equipment at ___ Location on Date___ Time___ in accordance with bridging authority____.
Time and date of application and removal, and by who.
The authorising signal engineer signature.
any correlation and function testing
Temporary bridging wire requirements
1.5m length minimum, orange or brightly coloured, 1.5mm^2 CSA flexible stranded, 0.6/1kV rating, individually labelled, kept in a locked box by the signal engineer or delegated team leader, signed in and out on a register.
What happens in an emergency if there is a need for a temporary bridging wire
A temporary bridge can be made with engineers approval, it must be fitted with a label and then destroyed immediately after use.
What protection needs to be confirmed with the signaller
Protecting signals to be placed at stop, points levers to be in correspondence with position in field. blocking facilities to be applied to signals and points
What notes are to be made on the IBA
“BRIDGED” to be written in next to equipment that has been bridged. example XYZ points BRIDGED.
How do you secure points that are bridged.
Points to be booked out and disconnected, points to be clipped and SL locked, any releasing switches, EOL/ESML or half pilot staffs are to be falcon 8 locked
How do you secure the Signals protecting the equipment temporarily bridged
The signals immediately protecting the equipment temporarily bridged are to be booked out and disconnected.
With engineers approval, some signals may be allowed to be booked in to facilitate train running
What conditions are required to book in protecting signals over bridged points.
Testing is satisfactory, points are locked and spiked, level crossings have a qualified worker manually operate the crossing , ESML/EOL/half pilot staffs/releasing devices are falcon 8 locked, the signal engineer that makes the determination has suitable experience relative to the complexity of the nature
Procedures for temporary bridging
Correlate to one clear point of intended temporary bridges, disconnect the portion of circuit leading to the bridges, disconnect the opposite detection circuit/contacts, apply bridges as per bridging authority only, do not bridge out portion of circuit not worked on.
Can temporary bridges be shorter than 1.5m in length
yes they can be shortened to fit into closed equipment with the authority of the authorising signal engineer. need to be labelled as shorter than regulation.
