FACP
Fire alarm control panel plan symbol
Plan symbol for fire detection control and indicating equipment, the panel that monitors detectors and drives alarms.
IEC
Functional block · SFII
Switchroom fire-system isolated-state input
Functional block · Switchrooms
An independently authored application reference. The drawing shows the named function or circuit relationship; use the project legend and selected equipment documentation for its drafting form and connections.
Browse this installation focusIn plain English
What this block does
Reports the defined disabled or isolated condition of the assigned fire-system interface.
A simple example
In a switchroom, the fire panel may report detection, system faults and a separately documented shutdown request to the station controller. These signals have different meanings and must not be combined into one unexplained alarm. For this reference, the drawing identifies “Fire-system isolation status” at the input and “Isolation indication” at the output. An isolated state changes detection availability.
What the drawings help you do
Start at the named input: Fire-system isolation status. Identify its source device or document and the state represented on the drawing. Follow the named output: Isolation indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Fire-system isolation status
- Output
- Isolation indication
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: Indoor substation: lighting, fire and auxiliary services
Schematic · SFII
What it represents
Reports the defined disabled or isolated condition of the assigned fire-system interface. A fire-system interface passes defined indications and control requests between the fire installation and electrical equipment. The receiving circuit must identify the exact purpose of the signal and the equipment it affects.
In a switchroom, the fire panel may report detection, system faults and a separately documented shutdown request to the station controller. These signals have different meanings and must not be combined into one unexplained alarm. For this reference, the drawing identifies “Fire-system isolation status” at the input and “Isolation indication” at the output. An isolated state changes detection availability.
Use the coordinated fire cause-and-effect schedule to define each response. Original interface blocks describe signal roles without specifying suppression operation, evacuation behavior or life-safety performance. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.
How to read it
- Start at the named input: Fire-system isolation status. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Isolation indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- An isolated state changes detection availability.
- Use the coordinated fire cause-and-effect schedule to define each response. Original interface blocks describe signal roles without specifying suppression operation, evacuation behavior or life-safety performance.
Information to show or reference
- Label the source and connection reference for fire-system isolation status.
- Identify the destination and defined state of isolation indication.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: An isolated state changes detection availability.
A distinction that matters
An isolated state changes detection availability. 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.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Indoor substation: lighting, fire and auxiliary services
Public technical context for switchroom fire and emergency interfaces. Lighting, emergency lighting, fire provisions and substation auxiliary services. Original cause-and-effect examples require project design. The application text and educational graphic are independently authored; the publisher does not certify this representation.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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