Creo Tutorials > Clearance and Creepage Extension > Beginners Tutorials > Non-homogeneous parts
  
Non-homogeneous parts
To perform an analysis using Clearance and Creepage Extension (CCX) application, you must specify the parts, features and surfaces that are conductive and the ones that are insulating. This can be done with the help of user parameters.
Part-wide CTI values can also be conveniently specified in the Part list of the Clearance and Creepage UI. For parts which are non-homogeneous, such as a fuse, the following steps have to be performed for the features or surfaces of a part.
1. Open Fuse.prt.
2. Click Tools > Parameters. The Parameters dialog box opens.
3. In the Look In box, select Feature.
4. Click and select the red surface of the fuse.
5. Click to add a new parameter.
a. Enter the parameter name as COMPARATIVE_TRACKING_INDEX.
b. Set the type to be Integer.
c. Set the value to be 600.
6. Click OK to close the Parameters dialog box.
7. Save Fuse.prt.
8. Open 13_amp_plug.asm
9. Click Analysis > Clearance and Creepage. The Clearance and Creepage dialog box opens.
10. Change the drop-down below the part list from None to Conductive (0).
11. Click Highlight CTI. All the conductive parts get highlighted.
 
* Only the end caps of the fuse get highlighted.