RMU PT (Potential Transformer) installation involves setting up a transformer within the Ring Main Unit (RMU) for accurate voltage measurement and system protection. PTs are used to step down high voltage to a lower, measurable level for monitoring, metering, and protection purposes. The installation process includes selecting the appropriate PT based on system voltage requirements, secure mounting, wiring, grounding, and integration with protection relays and control panels. Proper installation ensures that the RMU operates safely and efficiently, providing accurate voltage readings for fault detection and protection coordination. It is crucial for maintaining reliable power distribution in industrial, commercial, and utility applications.