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

PESB

Symbols

Portable equipment service-supply boundary

Marks the documented service connection for maintenance equipment within the room. An auxiliary AC distribution diagram identifies the supplies serving room services and control-support equipment. Essential, backed-up and ordinary circuits can have different source paths and operating priorities.

Drawing use: Schematic
Application: Installation & communications
Reference family: Manufacturer

A distinction that matters

Temporary connections need their own operating controls. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full reference

UPS AC

Symbols

AC uninterruptible power supply

An AC UPS provides a documented AC load supply through its normal and backup operating arrangements. The schematic identifies input, output and energy-storage interfaces as specified by the product.

Drawing use: SLD / Schematic
Application: Microgrid systems
Reference family: Manufacturer

A distinction that matters

An AC UPS output is different from the DC output of a DC UPS module.

Full reference

Follow the full entry for source drawings and the appropriate standard or selected product. Equipment previews show a manufacturer drawing where available, otherwise a 3D thumbnail.