Grounding Shield

[Postigo]

Hi, how is determine the size of the grounding conductor for putting the Metallic Shield of Medium or High Voltage Shielded Conductors, Stress Cones, to ground? I have been looking in the NEC 2005, and the only I have found is in Article 310.6 ? Shielding, that said that they have to ?be grounded through an effective grounding path meeting the requirements of 250.4(A)(5) or 250.4(B)(4).? In this article the only said is that;



?shall be installed in a manner that creates a permanent, low-impedance circuit facilitating the operation of the overcurrent device or ???



This really doesn?t make much sense. What overcurrent device?



This is not the primary purpose of grounding the shield.



Is there in the code another place that deal with this? Is there another source for this? Like NESC 2002, IEEE 80, IEEE 142????..etc,



If, let me know.





Thanks;



Ra?l A. Postigo

Mayag?ez, Puerto Rico

USA

 

[RUWired]

Postigo, Don explained it to you in your previous post. The size of the drain lead conductor to ground is the equivalent cross sectional area of the shield in the cable.