The Diagram shows:
- The methods of connection of a MV/LV substation to the utility supply:
*Spur network or single-line service
*Single line service with provision for future connection to a ring or to dual parallel feeders
*Dual parallel feeders
*Loop or ring-main service
- General protection at MV level
- MV metering functions
- Protection of MV circuits
- LV distribution switchboard
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