The One-Line represents power flow of the distribution system shown from top to bottom, and generally consists of Sources, Distribution Equipment, and Loads. Types of sources include a Utility or a Generator.

Using the Workspace Toolbar on the left, click the One-Line icon to open the Workspace.

Add a Source

Use the Setup Wizard in the top right and select Create a Source.

Sources specify the level of short circuit current (SCC) that is potentially available in faulted systems. Short circuit current contributions could stem from the generator’s sub-transient reactance or the utility takeoff secondary terminals.


Using the Setup Wizard

Using the New Network wizard, create a Utility Equipment.

When using the New Network wizard, only the minimum pieces of information are required to create a piece of Equipment. This information will vary from Equipment to Equipment. For example, when creating a transformer the secondary voltage must be specified, but for a mechanical load only the size of the motor is required. More detailed properties can be specified and modified later.

Or right-click inside the Workspace, click Add Source, then click Utility Source.

Note that the ability to add Unhosted Equipment is available.

Short Circuit Current

Select the Utility source. Under the “Miscellaneous” property grouping, enter the value under Available SCC (kA).


Entering Available SCC (kA)

Add Equipment

Click on the Utility and the Selection Dial will display a ring of options. Selected Equipment will be highlighted by a purple circle, with additional options to Add, Copy, Paste, Delete, and Navigate to other Workspaces. Click the + button to Add Equipment.


Selection Dial

Select an Equipment type from the dropdown menu. Give the Equipment a name. In this case, specify a Load Capacity, and click Select.


New Network Wizard

Copy/Paste Equipment

To copy Equipment, select the Equipment. Then, click Copy or use CTRL+C to copy. The selection will highlight pink and be added to the clipboard.

Then select the Equipment you want to create a pasted copy of, and click Paste or use CTRL+V.


Copying an Equipment will copy its entire downstream network

Delete Equipment/Delete Network

To delete Equipment, select the Equipment. Then Click Delete (trash symbol) or use DEL to delete.

If the selected Equipment is feeding downstream Equipment, you have the option to either delete the selected Equipment or the entire network. Deleting Selected Equipment will only delete what is selected and any downstream equipment or children of the Selected Equipment will be disconnected and considered Unhosted.


Deleting the selected Equipment or Entire Network

Dragging/Rehosting Equipment

To redirect an Equipment’s source, click and drag the Equipment from its current source to a different source.


Rehosting MTR-2 to DB-1

Expanding/Collapsing Equipment

Sections of the distribution network can be expanded or collapsed on a group basis by using Expand All/Collapse All.


Using Expand All/Collapse All to visually maneuver the distribution network

Another way is by clicking on a distribution node, or double-clicking on the Equipment itself.


Clicking on a distribution node individually expands or collapses the network


A distribution node fills when it is fully expanded

Changing Multiple Equipment Properties

It is possible to change a property which is common across multiple elements.

First, drag a box to select multiple elements, or use CTRL+Click to select each element.


Selecting multiple motors by dragging and dropping a selection box

Then change a property such as Conductor Material from copper to aluminum.


Using the Properties Explorer to change the Conductor Material

Note that since Design Assistance is on, the circuit’s code-minimum values are recalculated.


Viewing circuit properties as a result of changing the conductor material

Reset to Code Minimum

It is possible to manually modify circuit elements which cause a violation of safety codes and standards.

To recalculate or reset the values of a circuit to code-minimum values, right-click on an Equipment and use Reset to Code Minimum.


Using Reset to Code Minimum

Workspace Toolbox

Utility functions like searching, additional viewing properties, or calculation settings can be found on the Workspace Toolbox on the top toolbar.


One-Line Workspace Toolbox


To search for Equipment, click the magnifying glass in the top left. Start to type the name of an Equipment. A dropdown will appear with any Equipment matching the specified name. Select the Equipment, and the Workspace will navigate to the associated Equipment.


Searching for Equipment

Load Calculations

  • Normal: Calculations are based on the Net Load.

  • Board Capacity - 80% Calculations are based on 80% of the board’s Load Capacity.

  • Board Capacity - 60% Calculations are based on 60% of the board’s Load Capacity.

Property Tags/Quick Views

Property Tags can be applied to assist with design or network visualization. They provide flexibility with viewing specific properties of the model.

Click the tag symbol in the upper left of the Workspace Toolbox.

Quick Views are preset property groupings such as Voltage Drop, Loading, Load Diversification, and Circuit Routing.


Selecting the Voltage Drop Quick View

The number is an indicator of how many Property Tags are being displayed.

Use the Clear All button to clear the display of Property Tags.

Assigning Room Locations

The distance between two pieces of Equipment are determined by their Room location via an orthogonal route. Open the Property Tags, and select Room.


Using Property Tags to assign a Room

Assign a Room by clicking in the text box. If no Rooms are available, create them using the Architectural Workspaces.


Using Property Tags to assign a Room

For the Distribution Board, MDB-1, note the Calc. Length before and after a Room location is assigned.


Select a Room by clicking in the text box

Routing Through a Riser Shaft

To route through the Riser, add a Property Tag for Riser under Network Properties.


Routing Through a Riser

Assign a Riser and note the updated length.


Routing Through a Riser

One-Line View Selectors

Different Views such as Isolated Systems and Load Flow can be applied to aid the designer.

By default, Normal is selected.

Load Flow

Load Flow is recommended when studying how a system is loaded.


Using Load Flow view to diagnose loading concerns of the network.

Isolated Systems

Isolated Systems is recommended when viewing complex, redundantally distributed systems.


Using Isolated Systems to study loading as a result of different sources

Click on the arrow buttons to jump to the section of the distribution network.


Navigating to a different section of the network

Creating a Transfer Switch

Transfer switches are connected to a primary and secondary source of power. To create a transfer switch, click Add Equipment and choose ATS/STS.


Using Selection Dial to Add Equipment


Creating a transfer switch

To connect the secondary source of power, choose another distribution Equipment.

Then click Add Equipment and select an ATS/STS from the Existing dropdown menu.


Connecting to an existing transfer switch


Toggle the visibility settings of OCPD’s by clicking on Show OCPD.


Showing OCPDs on the One-Line

Open an OCPD by clicking on the OCPD.


An open breaker denotes an open circuit

Scenario Manager

The Scenario Manager can be used to model different scenarios representing the state of protective devices. It is generally used in conjunction with the One-Line.

For example, a designer may want to perform a load flow study of their electrical system as certain protective devices are opened or closed.

Open the Scenario Manager and show the OCPD’s on the One-Line.

Right-click on a protective device to add it to a Scenario.


Adding a protective device to the Scenario Manager

In each Scenario, toggle the different states of protective devices, and also toggle between different Scenarios as shown below. Note that the color of live Equipment changes when a protective device is opened or closed.


Scenario 1 with Sub-Scenario 1 Active


Scenario 1 with Sub-Scenario 2 Active

Bus Duct

Select an Equipment. Then select Add Equipment to create a Bus Duct.


Using the New Network Wizard to create a Bus Duct

Visually, the representation of a Bus Duct is misleading and will be changed in an upcoming update. See here for a reference to how loading and voltage drop calculations apply to a Bus Duct.


A Bus Duct with Panelboards as branch loads