Read the diagram as an interface map
A low-voltage switchgear diagram should show sources, incomers, buses, ties, feeders, protection, metering, control power, earthing, and relevant interfaces. It is a design communication tool, not a substitute for the detailed assembly drawings.
Inputs to verify
| Diagram item | Why it matters |
|---|---|
| Source and transformer | Establishes incoming voltage and fault basis |
| Bus and tie arrangement | Shows normal, transfer, and maintenance paths |
| Feeders and loads | Connects devices to the load schedule |
| Protection and metering | Identifies relays, CTs, meters, trips, and alarms |
| Control and earthing | Documents operating logic and fault-return boundaries |
Scope boundary
The responsible engineer must verify the diagram against calculations, drawings, and manufacturer data. This article does not provide a construction or energization instruction.
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