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In the Electrical Index, expand the folder hierarchy Wiring Equipment > Panels.
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Right-click the Local Panels folder or the Junction Boxes folder and select an item.
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Right-click the local panel or the junction box where you want to add the circuit and select New Circuit.
Also, you can add a panel circuit by expanding the Typical Circuits folder in the Reference Data Explorer and dragging an existing typical panel circuit 
to the local panel or the junction box.
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Accept the default item tag that is based on the naming convention for the circuit or type your own item tag according to the naming convention. See Using Naming Conventions.
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Right-click the required circuit and on the shortcut menu, select an option to create new disconnect, protection, converting or control equipment.
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Repeat the previous step as often as needed to create additional items for the circuit.