Alterations to Signalling Power Systems
|Publication Date:||4 March 2017|
The diagrams below illustrate the system boundary and associated sub-systems of typical SPSs to which this specification applies. Other electrical architectures of an SPS also exist (examples are shown in Appendix B) but the key sub system elements are generally the same.
This standard defines the functional and electrical requirements to be applied when undertaking alterations to existing Signalling Power Systems (SPSs).