Add a new kind of wire size type into this temperature rating type. 
   Namespace:   Autodesk.Revit.DB.Electrical  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- size
 -  Type:  System String  
Size of wire size. 
- ampacity
 -  Type:  System Int64  
Ampacity of wire size to be added. 
- diameter
 -  Type:  System Double  
Diameter of wire size to be added.