Busbar and connection symbols
The lines on a one-line diagram are the conductors. A heavy line is a busbar, a dot is a connection, and lines that cross without a dot are not connected.
Busbars and connections: ANSI and IEC
Busbars, connection dots and crossings are drawn the same way in both standards, which is why they are easy to read on any one-line. A heavy line is a busbar, a dot joins two conductors, and a crossing without a dot is not a connection.
On older US drawings a crossing may have a small hop where one line jumps over the other. On CAD drawings a plain crossing is the norm.
Frequently asked questions
Which busbars and connections appear on a single line diagram?
This legend covers busbar, connection, crossing, not connected. Project legends may add more.
Are these symbols different in IEC and ANSI?
1 of the 3 are drawn differently. Each symbol page shows both forms side by side.
Can I download these symbols?
Yes. Each symbol page has free SVG files, and the hub has printable PDF charts.
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