The Load attribute on a service point can be calculated and set using validation rules. It is recommended to create an Expression subrule that evaluates to the calculated value required and then to use that subrule within the validation rule in order to validate and set the attribute using a "Report and fix" rule.
For example, below is a general example for calculating and setting an attribute. In your case, you would be setting the Load attribute:
/Expressions/Real/Electric/Point/Service Point/Calculated Load
...calculate your load in the expression
/Validation/Electric/Point/Service Point
If [Load] is not equal to [Calculated Load]
Then
Report and fix "Load requires updating" auto-resolve enabled
Resolution "Update to calculated load"
Update multiple attributes
Set attribute Load = [Calculated Load]
In the latest release of the product, this can be simplified by using the Set attribute function directly:
If [Load] is not equal to [Calculated Load]
Then
Set attribute Load = [Calculated Load]
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