In O-Calc there are a number of options available to customize the tension on a span. These options can be found by selecting a span, and selecting the Tension Sag filter in the Data Entry Window. When Table is selected, a Tension Table can be created by selecting the light blue dot to the right ..
The O-Calc Pro master catalog includes a number of options regarding types of insulators that may be used for modeling accurately. Among these options are Pin insulators, which can be set in O-Calc to either be free or clamped; essentially either allowing the tensions among the attached spans to equalize, or stay fixed. ..