The following procedure explains how to size a cable that uses a custom basic ampacity. For details about defining a custom basic ampacity, see Define Custom Basic Ampacity for Cable Sizing.
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Right-click a required cable and then on the shortcut menu, select Cable Common Properties.
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On the Cable Common Properties dialog, select the Sizing Data tab.
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From the Routing list, select an appropriate custom routing definition. Make sure that you select one of your custom routes and not InAir or UnderGround. If you select InAir or In Ground, the software will not use the custom ampacity value to size the cable.
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In the Sizing results group box, select the Calculate Sizing button.
The basic ampacity value that was used to size the cable appears on the General tab of the Cable Common Properties dialog, under Custom basic ampacity.