One-Line Devices

This section describes how to create one-line devices. "One-line device" is a term we created to refer to all the devices that might appear on your one-line diagram. They include everything in your electrical design except for devices on branch circuits.

The devices you create for your one-line diagram are the same devices you use when circuiting devices, calculating fault, and calculating voltage drop.

Types of One-Line Devices

There are eleven different types of one-line devices that can be created. If your project includes a device that is not explicitly listed, use another type of device that is most similar.

Panels
Switchboards
Transformers
Wireways
Bus Gutters and Bus Ducts
Enclosed Breakers and Disconnects
Uninterrupted Power Supplies
Motor Control Centers
Generators
Transfer Switches
Low Voltage Panels

Common One-Line Device Information

This section describes common values that can be specified for one-line devices. The information listed below is applicable to all one-line devices unless otherwise indicated.

Total Connected KVA: The connected load on the panel, in kVA.

Total Calculated KVA: The calculated load on panel, including all of the diversity factors, in kVA.

Total Connected Amps: The connected load on the panel, in amps.

Total Calculated Amps: The calculated load on panel, including all of the diversity factors, in amps.

Show in Fault Schedule: Whether the device is displayed in the fault schedule.

Show in Feeder Schedule: Whether the device is displayed in the feeder schedule.

Show in Voltage Drop Schedule: Whether the device is displayed in the voltage drop schedule.

Show in One-Line Diagram: Whether the device is displayed on the one-line diagram.

Show in List: Whether the device is displayed in the list of devices of this type.

Volts: The voltage of the device. Does not apply to Low Voltage Panels.

The label on this field for Transformers and UPSs is Secondary Volts.

The Volts setting can be changed when there are no connections to or from the one-line device. If the device is connected to another device, another device is connected to it, or any branch-circuit devices are connected, the Volts setting cannot be directly changed. Instead, use the Change Volts button to change the Volts of the device. This button is required to properly handle anything that is already connected. See the Changing the Voltage of a One-Line Device section below for more information.

Primary Volts: The primary voltage of the devices. Applies to transformers and UPSs. If the transformer or UPS is connected to another one-line device, use the Change Volts button to change this setting.See the Changing Voltage of One-Line Device section for more information.

The Primary Volts and Secondary Volts settings must both be single-phase or three-phase.

Bus Amps: The size of the bus, in amps. Applies to Panels, Switchboards, Bus Gutters/Bus Ducts and Motor Control Centers.

The label on this field for Motor Control Centers is Vertical Bus Amps.

Main Disconnect Type: The type of disconnect for the device. The graphics on the panel bus in the one-line diagram are controlled by this field. Applies to Panels, Switchboards, and Motor Control Centers.

Main Lugs Only: The bus bar on the one-line diagram does not have a disconnect in it.
Breaker: The bus bar on the one-line diagram includes a breaker graphic.
Fused Switch: The bus bar on the one-line diagram includes a fused switch graphic.

Main Disconnect Amps: The size of the main disconnect breaker or fused switch, in amps. This value cannot be set if Main Disconnect Type is set to Main Lugs Only. Applies to Panels, Switchboards, and Motor Control Centers.

Mounting: How the device is mounted. The value of this setting can be displayed on the one-line device schedule. It is for informational purposes only and is not otherwise used. Does not apply to Transformers, Enclosed Breakers/Disconnects, or Low Voltage Panels.

<Device Type> Neutral: The size of the one-line device neutral. The value of this setting can be displayed on the one-line device schedule. It is for informational purposes only and is not otherwise used. Applies to Panels, Switchboards, UPSs, and Transfer Switches.

The label on this field depends upon the device type. The possible labels include Panel Neutral, Switchboard Neutral, UPS Neutral, and TS Neutral.

Number of <Connection Types>: How many connection location are available on this device.

The label on this field depends upon the device type. The possible labels include Number of Poles, Number of Positions, Number of Lugs, Number of Taps, Number of Starters, and Number of Breakers.

Starting <Connection Type>: The corresponding words that fills the blank for the respective One-Line Devices are provided below. This is the number used for numbering the items listed. The default is to start at the number 1 and go from there. However, in some cases, it is important to be able to start the numbering at a different point. For example, on a two section panel that is treated like an 84 circuit panel, the circuit panels are numbered as 2 to 42 and 43 to 84.

The label on this field depends upon the device type. The possible labels include Starting Circuit, Starting Position, Starting Lug, Starting Tap, Starting Starter, and Starting Breaker.

Lugs: The lugs available on the device. The setting controls the type of connection you can make using the One-Line Device Connections command and the graphics displayed on the bus bar on the one-line diagram. Applies to Panels, Switchboards, Enclosed Breakers/Disconnects, and Transfer Switches.

Standard: One set of lugs at the top of the bus.
Double: Double lugs located at the top of the bus. Enables the Top Lugs option in the One-Line Device Connections command.
Feedthru: Lugs located at the top and bottom of the bus. Enables the Feed Through option in the One-Line Device Connections command.

<Device Type> IG Bus: Whether or not the device contains an isolated ground bus. The value of this setting can be displayed on the one-line device schedule. It is for informational purposes only and is not otherwise used. Applies to Panels, Switchboards, UPSs, and Transfer Switches.

The label on this field depends upon the device type. The possible labels include Panel IG Bus, Switchboard IG Bus, UPS IG Bus, and TS IG Bus.

Plan View Block: The block used for the one-line device on the plan where it is inserted. This list is based upon the settings in the One-Line Device Plan View Blocks command.

Custom Size: The size of the device, in inches, if the Plan View Block is set to a block with Custom Size set to Yes. These fields are disabled when a block with Custom Size set to No is selected.

Depth: The size of the device in the y-direction, perpendicular to the rotation angle of the block.
Width: The size of the device in the x-direction, parallel to the rotation angle of the block.
Height: The size of the device in the z-direction.

Elevation: The elevation of the one-line device. See the Elevation section for more information.

Layer System: See the Layer System section for more information.

Schedule Block: The block used for the one-line device schedule. This list is based upon the settings in the One-Line Device Schedule Blocks command.

Location: The location of the device. The value of this setting can be displayed on the one-line device schedule. It is for informational purposes only and is not otherwise used.

Note 1: A generic note field.The value of this setting can be displayed on the one-line device schedule. It is for informational purposes only and is not otherwise used. In the default schedule blocks, this note is displayed in the header.

Note 2: A generic note field.The value of this setting can be displayed on the one-line device schedule. It is for informational purposes only and is not otherwise used. In the default schedule blocks, this note is displayed below the schedule.

Changing the Voltage of a One-Line Device

When a one-line device is first created, it is possible to change the voltage using the Volts field. When the device is connected to another device, another device is connected to it, or any branch-circuit devices are connected, the Volts setting cannot be directly changed. Instead, use the Change Volts button to change the Volts of the device. This button is required to properly handle anything that is already connected.

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Press the Change Volts button to display the Change Volts dialog box. The dialog box that is display depends upon whether you are changing the voltage of a transformer or another type of one-line device.

Change Volts Dialog Box (Non-transformers)

This dialog box is used for one-line devices other than transformers.

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Current Volts: The current voltage supplied to the one-line device.

New Volts: A list of the current and possible voltages for the one-line device. The listed voltages are the ones that share at least one circuit voltage in common.

Change Volts Dialog Box (Transformers and UPSs)

This dialog box shown below is used for transformers.

One-Line Devices--Change Volts dialog box

Primary Volts: The primary voltage supplied to the transformer.

Secondary Volts: The secondary voltage supplied to the transformer.

Current Volts: The current voltage supplied to the transformer.

New Secondary Volts: A list of the current and possible voltages for the transformer. The listed voltages are the ones that share at least one circuit voltage in common.

The Primary Volts and Secondary Volts settings must both be single-phase or three-phase.

Specifying the New Voltage

Select the desired new voltage and press OK. The Design Master Electrical dialog box shown below will appear.

One-Line Devices--DM Electrical circuited device alert

When the voltage on the one-line device is changed, the circuited devices are all checked for consistency. Any devices that cannot be connected to the newly selected voltage are removed and devices that can remain connected do so.

All one-line devices connected to the selected one line device are disconnected. The one-line device is also disconnected from the device to which it was connected. These connections must be reestablished using the One-Line Device Connections command.


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