# Normally split busbar operating arrangement

Canonical URL: https://eloragrid.ai/symbols/normally-split-busbar-operating-arrangement
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: NSBOA
Drawing use: SLD, Schematic
Reference families: Manufacturer

Representation: Circuit arrangement
Installation focus: switchyards
Input: Bus sections and normal open point
Output: Split normal operating state

Shows the defined normal separation between bus sections that can be connected by switching.

## In plain English

### What this arrangement shows

Shows the defined normal separation between bus sections that can be connected by switching.

### A simple example

In a switchyard, a single-line arrangement helps identify the bay connections, tie devices and possible alternate supply paths. Normal open points must remain separate from the equipment's physical ability to close. For this reference, the drawing identifies “Bus sections and normal open point” at the input and “Split normal operating state” at the output. Normal position is not a permanent wiring difference.

### What the drawings help you do

Start at the named input: Bus sections and normal open point. Identify its source device or document and the state represented on the drawing. Follow the named output: Split normal operating state. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Bus sections and normal open point
- Output: Split normal operating state
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Bus sections and normal open point → NSBOA → Split normal operating state
A reading guide. The entry's original illustration and input/output facts describe this application.

- [SEL-451 protection, automation and bay control](https://selinc.com/products/451/)


## What it represents

Shows the defined normal separation between bus sections that can be connected by switching. A busbar arrangement defines the available paths between incoming circuits, outgoing circuits and bus sections. Its switching devices and measurement boundaries determine how a circuit can remain connected when part of the installation is unavailable.
In a switchyard, a single-line arrangement helps identify the bay connections, tie devices and possible alternate supply paths. Normal open points must remain separate from the equipment's physical ability to close. For this reference, the drawing identifies “Bus sections and normal open point” at the input and “Split normal operating state” at the output. Normal position is not a permanent wiring difference.
Name each bus, bay and switching device. The arrangement illustrates electrical connectivity; reliability, fault levels, permitted switching and protection coordination require the actual network design. The circuit arrangement 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: Bus sections and normal open point. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Split normal operating state. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Normal position is not a permanent wiring difference.
- Name each bus, bay and switching device. The arrangement illustrates electrical connectivity; reliability, fault levels, permitted switching and protection coordination require the actual network design.

## Information to show or reference

- Label the source and connection reference for bus sections and normal open point.
- Identify the destination and defined state of split normal operating state.
- Record the equipment or control-document revision supporting this circuit arrangement.
- Check this application limit in the project design: Normal position is not a permanent wiring difference.

## Important distinction

Normal position is not a permanent wiring difference. 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.

## Facts

- Representation: Circuit arrangement
- Installation focus: Switchyards
- Input / boundary: Bus sections and normal open point
- Output / connection: Split normal operating state
- Lookup label: NSBOA is a library lookup label, not a standard device designation.

## Public references

- [SEL-451 protection, automation and bay control](https://selinc.com/products/451/) — SEL. Public technical context for switchyard busbar arrangements. Bus arrangements, breaker control and bay-level coordination. The application text and educational graphic are independently authored; the publisher does not certify this representation.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.