Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

Symbols

Lightning protection down-conductor

Down-conductors run from the air termination network on the roof to the earth electrodes, carrying lightning current by the shortest practical path. Installation guidance describes them as part of the building protection system together with the capture device and earth leads. Elevations and roof plans show them as a distinct line style.

Drawing use: GA / Schematic
Application: Connections & wiring
Reference family: IEC / IEEE / ANSI

A distinction that matters

A down-conductor carries lightning current to earth; a protective earth conductor carries fault current from the electrical installation.

Full reference

Symbols

Lightning air termination

The air termination is the capture device of a lightning protection system. It can be a vertical rod, a stretched wire or a roof mesh. Roof plans mark rods at their positions, and the protected zone around them is set by the design method used.

Drawing use: GA / Schematic
Application: Connections & wiring
Reference family: IEC / IEEE / ANSI

A distinction that matters

An air termination captures the strike; a surge arrester limits overvoltage on electrical conductors.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.