GA
Panel service outlet
A panel service outlet provides the specified auxiliary socket interface.
General arrangement objects
Functional block · EFTI
Essential-service feeder trip indication
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
Identifies an operated protective device on the assigned essential service branch.
A simple example
In a switchroom, the lighting, service sockets, charger input and room cooling may be fed from different auxiliary branches. A source change must preserve the identities of loads that require continuity. For this reference, the drawing identifies “Branch protective-device status” at the input and “Essential feeder fault alarm” at the output. Alarm naming must identify the actual branch.
What the drawings help you do
Start at the named input: Branch protective-device status. Identify its source device or document and the state represented on the drawing. Follow the named output: Essential feeder fault alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Branch protective-device status
- Output
- Essential feeder fault alarm
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: SEL-RPM redundant power module
Schematic · EFTI
What it represents
Identifies an operated protective device on the assigned essential service branch. 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.
In a switchroom, the lighting, service sockets, charger input and room cooling may be fed from different auxiliary branches. A source change must preserve the identities of loads that require continuity. For this reference, the drawing identifies “Branch protective-device status” at the input and “Essential feeder fault alarm” at the output. Alarm naming must identify the actual branch.
Label source, branch protection and load purpose. The arrangement does not establish conductor sizes, protection settings or installation compliance; it links the operating role to the selected equipment schedule. 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: Branch protective-device status. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Essential feeder fault alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Alarm naming must identify the actual branch.
- Label source, branch protection and load purpose. The arrangement does not establish conductor sizes, protection settings or installation compliance; it links the operating role to the selected equipment schedule.
Information to show or reference
- Label the source and connection reference for branch protective-device status.
- Identify the destination and defined state of essential feeder fault alarm.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Alarm naming must identify the actual branch.
A distinction that matters
Alarm naming must identify the actual branch. 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.
SEL-RPM redundant power module
Public technical context for switchroom auxiliary ac distribution. Independent AC and DC sources for station auxiliary power. 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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