Tutorial: Clearance and Creepage Analysis

Clearance and Creepage Analysis

Clearance and Creepage Analysis (CCX)

CCX has many advantages over the previous Spark Analysis solution, which continues to be available in Creo Parametric 4.0. For example, in CCX hidden components in an assembly are automatically excluded from the clearance and creepage analysis. There are tools to highlight the conductive, isolating, and undefined components. Any component with a CTI value of minus one does not have a value set for the comparative tracking index parameter. Setting CTI values within CCX automatically appends the parameter to the part or updates the existing values for the parameter. Nonhomogeneous parts such as a fuse, are also supported. For example, in a fuse the comparative tracking index can be set to zero so the entire part is conductive. You can apply a comparative tracking index parameter to the nonconductive surfaces of the fuse and set it to be an isolator value, such as 600. When in CCX, only the conductive areas that have a CTI value of zero are highlighted. In the Clearance and Creepage dialog box, click Menu > Options to set the value for the analysis to inch or millimeters. Nets are defined automatically but you can define your own net names if desired. After you define you net names you need to define if the net type is Potential-free, Potential, or Grounded. If you have screws with threads, springs, or rivets in your design, you can choose to define the type of that part. To run an analysis you must define the source for the analysis and set the clearance and creepage distances for each of the target nets. You can also set a violation tolerance, which may result in an analysis that previously passed, to fail. You can then investigate individual paths or all paths for both clearance and creepage. You may also want to store the analysis for future reference, such as for a design review.

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