Understand the difference.

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

BD

Symbols

Feeder busway

Feeder busway carries high current between a transformer and switchboard, or between switchboards, in an enclosed busbar trunking rather than parallel cables. Single-line diagrams draw it as a distinct line style or double line with its rating, so that it is not mistaken for cable.

Drawing use

SLD / GA

Application

Connections & wiring

Reference family

IEC / IEEE / ANSI / Manufacturer

A distinction that matters

Feeder busway has no tap-off points; plug-in busway provides outlets along its length.

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.