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

SHCI

Symbols

Switchroom HVAC common-fault interface

Carries the HVAC unit's declared fault output into the electrical station alarm system. Ventilation control coordinates the equipment that manages heat and air movement in an electrical room. A temperature request, a fan command and proof of airflow are separate signals, and the room design determines how they interact.

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

A distinction that matters

The contact does not identify every HVAC failure. 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

SCI

Symbols

Switchroom cooling-available indication

Reports the documented availability of the assigned room-cooling equipment. Ventilation control coordinates the equipment that manages heat and air movement in an electrical room. A temperature request, a fan command and proof of airflow are separate signals, and the room design determines how they interact.

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

A distinction that matters

Availability is different from thermal capacity. 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

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.