GA
Switchroom exhaust fan
An exhaust fan removes air along the documented room ventilation route.
General arrangement objects
Functional block · IOG
Intake-damper open-proof gate
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
Uses the intake-damper feedback as a condition of the assigned ventilation operation.
A simple example
In a switchroom containing transformers and auxiliary panels, the room controller can supervise fan availability and send an alarm when the documented ventilation duty is not achieved. For this reference, the drawing identifies “Damper open proof” at the input and “Ventilation permission” at the output. Position proof does not measure effective airflow.
What the drawings help you do
Start at the named input: Damper open proof. Identify its source device or document and the state represented on the drawing. Follow the named output: Ventilation permission. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Damper open proof
- Output
- Ventilation permission
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: Ventilation in MV substations
Schematic · IOG
What it represents
Uses the intake-damper feedback as a condition of the assigned ventilation operation. 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.
In a switchroom containing transformers and auxiliary panels, the room controller can supervise fan availability and send an alarm when the documented ventilation duty is not achieved. For this reference, the drawing identifies “Damper open proof” at the input and “Ventilation permission” at the output. Position proof does not measure effective airflow.
Identify the monitored space, the selected ventilation mode and the equipment feedback. Avoid inferring airflow, temperature limits or a fire response from a generic fan symbol; these require the room-services design. 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: Damper open proof. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Ventilation permission. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Position proof does not measure effective airflow.
- Identify the monitored space, the selected ventilation mode and the equipment feedback. Avoid inferring airflow, temperature limits or a fire response from a generic fan symbol; these require the room-services design.
Information to show or reference
- Label the source and connection reference for damper open proof.
- Identify the destination and defined state of ventilation permission.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Position proof does not measure effective airflow.
A distinction that matters
Position proof does not measure effective airflow. 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.
Ventilation in MV substations
Public technical context for switchroom ventilation interfaces. Heat removal, condensation and environmental design context. 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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