Code Quiz: Conductor Shielding

Which of the following choices is not correct regarding the primary purpose(s) of shielding of solid dielectric insulated conductors operated at over 2,000V in permanent installations?

A) Carry ground-fault to current to nearest grounding electrode
B) Confine the voltage stresses to the insulation
C) Dissipate insulation leakage current
D) Drain off the capacitive charging current

See the answer below.

 

 

 

 

 

 

 

 

Answer: A

As outlined in the Informational Note of Sec. 310.10(E), the primary purpose(s) of shielding of solid dielectric insulated conductors operated at over 2,000V in permanent installations are “to carry ground-fault current to facilitate the operation of ground-fault protective devices (in the event of an electrical cable fault), to confine the voltage stresses to the insulation, to dissipate insulation leakage current, and to drain off the capacitive charging current.”

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].

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