Understand the difference.

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

TO

Symbols

Busway tap-off connection

This symbol shows a tap-off unit plugged into the busway, with the outgoing circuit leaving through a fuse or circuit breaker in the unit. On single-line diagrams it replaces the board-and-feeder pattern used for switchboards, since the busway itself acts as the distribution bus.

Drawing use

SLD

Application

Connections & wiring

Reference family

IEC / IEEE / ANSI / Manufacturer

A distinction that matters

A busway tap-off is a plug-in connection with its own protection; a one-line bus tap is a generic connection to a busbar.

Full referenceAdd to legend

BD

Symbols

Plug-in busway

Plug-in busway distributes power along its route through outlets into which tap-off units can be inserted. It is common in rising mains in multi-storey buildings, factory floors and data halls, where loads change and new feeders are added without rewiring.

Drawing use

SLD / GA

Application

Connections & wiring

Reference family

IEC / IEEE / ANSI / Manufacturer

A distinction that matters

Plug-in busway has outlets for tap-off units; feeder busway carries power point to point only.

Full referenceAdd to legend

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