Response to Norm Dill's  message...Years back I spent a week at the 
Biddle School in Plymouth Meeting, PA, supposedly learning how to detect 
partial discharges (arcs that do not bridge conductive electrodes) in 
insulators.  Partial discharge (sometimes called, erroneously, "corona") 
is what is responsible for long term destruction of insulation, in many 
cases.  Most resistant materials are inorganics, less resistant are 
natural organics (paper), and least resistant are synthetic 
organics (epoxy encapsulants, for example).  
Lou Hart	Compunetics

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