Final answer:
The question pertains to the requirement of installing system-associated cabling in a rigid conduit when it goes beyond the protected area perimeter, especially in applications like electrified transportation systems.
Step-by-step explanation:
The question is regarding the installation requirements for system-associated cabling that extends beyond the protected area perimeter. In the context of wired systems for electrified transportation, such as those used by trains, trolley buses, and high-speed trains, the cabling must often be protected to ensure safety and reliability. Rigid conduit provides this protection by encasing cables in a solid pipe, often made of metal or heavy-duty plastic, protecting the wiring from physical damage, as well as reducing electrical interference and improving system security.
For instance, overhead lines and third rails are commonly used to supply electricity to trains and trolley buses. The cabling for these systems would be required to be installed in rigid conduit where it passes outside of the protected area to shield the wires from environmental elements, prevent unauthorized access, and comply with safety regulations.