Normal operation
Describe which sources and bus sections are energized and how loads are normally supplied.
Engineering guide
Define the distribution system
Create a clear technical starting point by documenting supply, boundaries, operating modes and equipment functions.
At a glance
Define the distribution system
A single-line diagram is most useful when it is supported by a short written description of the system boundaries, normal operating mode and exceptional conditions.
Equipment selection
Match the equipment to the electrical system
A single-line diagram is most useful when it is supported by a short written description of the system boundaries, normal operating mode and exceptional conditions.
Project information
- Nominal system voltage and frequency
- Source quantity and operating modes
- Earthing arrangement and ownership boundary
- Incomer, bus-section and feeder functions
- Future expansion or spare-way requirements
Selection details
Key considerations for this application
Alternative operation
Document transfer, maintenance and contingency modes that change equipment duty or interlocking.
Interfaces
Identify upstream protection, downstream loads and control or communication connections.