Medium Voltage Cable Shields
Medium Voltage Cable Shields
(OP)
I can't seem to find any information on using the shield (tape, wire, uni-shield etc.) in medium voltage cable as the equipment grounding conductor. In installations I have been involved with we always pulled an equipment grounding conductor along with the feeders and grounded the shields at every termination and splice. This was engineered on the drawings. I have seen older installations where PVC was used and no separate equipment grounding conductor pulled. Can someone give me a run down on what is allowed and what is not? Can shields be used to meet the requirements of article 250 of the NEC? Thanks






RE: Medium Voltage Cable Shields
Related discussion at
Thread238-94974
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One thing that sometimes gets overlooked is arrestor termination in IEEE Std C62.22.1 …Connection of Surge Arresters…
Also IEEE Std 1215 …Application of Separable Insulated Connectors
RE: Medium Voltage Cable Shields
RE: Medium Voltage Cable Shields
There is manufacturer boilerplate..
www.kerite.com/catalog/catalogfiles/short_circuit_limitations.htm
www.okonite.com/engineering/shielding-currents.html
Code-enforcement officials may consider this data as part of a listed cable’s installation instructions, concerning adequacy of cable shields (alone) for fault withstand.
RE: Medium Voltage Cable Shields
ppaya
RE: Medium Voltage Cable Shields
Do not design a system based on what the NEC doesn't directly prohibit, rather, it is up to you to find an article allowing what you want to design (especially if it isn't in common usage).
RE: Medium Voltage Cable Shields