One Line Device Connections

Before a one line diagram can be drawn, Design Master needs to know how each device is connected to the others.

This dialog box will walk you through the connection process as indicated by Steps 1 through 3. The steps are described below.

Begin by selecting the device that is going to be connected in the Step 1 section of the dialog box. Think of this as the 'downstream' device.

The next step is to select the device to connect from. Think of this as the 'upstream device'. Select it from the Step 2 section of the dialog box under Source. Note that above the Source are the Source 1 and Source 2 options. Source 2 will only be available if you have chosen a UPS or transfer switch back in Step 1.

After selecting the 'upstream device', select the type of connection from the same area of the dialog box. The available options are breaker/tap, top lugs, and feed through. Only certain connection types will be available depending on which type of 'upstream device' you selected earlier in Step 2. Loads between devices are calculated the same whether the connection is a feed through, top lug connection, or a breaker/tap connection.

•	Breaker / Tap: All devices will allow you to select Breaker/Tap as the connection type. If you select this method, you must then specify which breaker or tap you are connecting from under Odd Breakers/Taps.

•	Top Lugs: Panels, switchboards, breakers, disconnects, and transfer switches will allow you to select different lug configurations when you set them up using the one line device commands. Depending on how you have defined them, they can now be connected directly to the bus at the top.

•	Feed Through: Panels, switchboards, breakers, disconnects, and transfer switches will allow you to select different lug configurations when you set them up using the one line device commands. Depending on how you have defined them, they can now be connected directly to the bus as a feed through.

If you choose a breaker connection, you will need to make sure there is an appropriate breaker available. If the connecting device is three pole, you will need to connect to a three pole breaker. If none exists on the panel, you may use the Change Number of Poles button to create one. After pressing the button, you will see the Change Number of Poles dialog box.

Select the number of poles necessary and press OK. You will be returned to the One Line Device Connections dialog box.

When you have finished inputting the desired connection information regarding the one line connection, press the Step 3 button at the bottom of the dialog box. Note that any two devices that you wish to connect must have the same voltage. Unmatched voltages will result in a Design Master dialog stating that the voltages to not match and the devices will not be connected. When you have pressed the Step 3 button and the voltages match, the two devices will be connected in the database and the command is complete. You will be able to check the connection you have created by proof-reading the connection as described underneath the Step 2 section of the dialog box (see below information underneath the Volts field.)

When you connect a one line device, the layer system of the connection is automatically set to match the layer system of the device that was connected. To change this, you can use the Set Connection Layer System button in the Step 2 area of the One Line Device Connections dialog box. Press the Set Connect Layer System button. The Connection Layer System dialog will appear.

Select the layer system for the connection and press OK. The connection will be updated in the database with the new layer system. If the device is already on the drawing in a one line diagram, you will need to run the Update One Line Diagram command in order to update the layer on the drawing.