AC/DC ELECTRIFIED LINES Flashcards
What is the voltage of the AC overhead line equipment?
[1]
25000 volts AC
When is the AC OLE live?
[1]
Considered live at all times
What equipment specific to OLE and 3rd rail DC on trains should be treated as live at all times?
(2)
Pantographs-AC
Collective shoes-DC
What is the minimum safe distance from OLE?
[1]
2.75 meters
Who would you contact to gain an OLE emergency switch off ?
[1]
ECO
Who is in charge of the switch off?
[1]
The person who requests the switch off
PICEE
the safe distance before requesting an emergency switch off?
[1]
2.75 meters
Whilst driving your train you observe something hanging from the OLE that could compromise the safety of trains, what must you do?
[2]
Stop the train
Call the signaller to block the lines
What is the orange line around the top of the train called and what is its relevance?
(2)
CANT rail line. Shows you that you are not allowed to climb above this point
When an emergency switch off is granted, the person who requested it is given a reference number. How is this number made Up and what is its purpose?
(2)
Number is made up from the 24 hour clock, at the time you call the Eco. When contacting the Eco this reference number should be quoted
What are the names of the five main wires on the OLE?
5
Cantenary Contact Dropper Red bond Return conductor
When requesting an emergency switch off for the OLE, what additional information can you give that will help identify the exact location?
[1]
Structure plate number
What is the normal voltage of DC electrified lines?
[1]
650-750 DC
How would you ensure your safety when crossing the track in a DC electrified area?
(4)
Cross at right angles
Cross 3rd rail and running rail in one step
Use designated gaps
Use a bridge if available
How can you recognise DC third rail a d fourth rail areas?
2
Third rail lays outside the 4ft
Fourth rail lays inside the 4ft
Both are mounted on insulators
