When a new electrical element is created (except for Power Sources), it will be supplied by the currently selected element. 
If needed, you can adjust what the element is supplied from. 
- Press F9 to open the System Browser. 
  
- If necessary, from the drop-list, select Electrical Analytical Systems. 
  
- Select an electrical element. 
  
- You can specify the Supply From property in one of two ways: 
	 - On the Modify tab, click the Supply From drop-down and select the element the selected component is fed from. 
		
- In the Properties palette, specify the Supply From property. 
		
 
Tip: In the System Browser, you can right-click an electrical element and click the Supply From drop-down to select a distribution system. 
  
Note: Transfer switches have two sources.