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

SHAF

Symbols

Switchroom heater auxiliary feeder

Shows the assigned supply circuit for room or enclosure conditioning heaters. 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

Heater availability does not establish humidity control. 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.