Fault Tree Points

[PJW]

Firstly, define what you mean by points.

Jerry

Before anyone says that Jerry is taking too much of a module 1/7 view, do reflect on the 2007 module 5 question:

For a top event of your choice, prepare a fault tree for a set of power operated points including the switch and stock rails, identifying the most probable cause of the top event.
[15 marks]
Describe the precautions to be taken to protect against this top event.
[5 marks]


However do READ carefully; in 2004 the question clearly focussed on the signalling element but not exclusively the on track equipment:

Draw a fault tree for a point machine of a type you are familiar with. Include in your answer the machine and all its components, the mechanical connections to the track, the cables between the machine and its controlling apparatus, and the detection relays.