Medium Voltage: Line to Ground Circuit

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xguard

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Baton Rouge, LA
I have a conduit, 4" PVC coated steel conduit, running along a bridge. Well it was mounted on a bridge, a hurricane recently removed most of it though. In the conduit is one single conductor 1/0 35kv shielded and 1 single conductor #6, according to the original plans. I'm not sure if it's copper or aluminum. System voltage is 34.5kv - 19.9 kv. As I'm not familiar with high voltage maybe this is actually a typical installation, but it seemed funny to me. It looks to be installed in accordance with the original stamped plans. I expected three lines for a single phase line to neutral high voltage circuit; line, neutral and ground. Is the green #6 likely being used for the neutral and grounding? Is this common with this level voltage for conduit installations? Can anyone point me to the code that would cover this? It's customer owned (entity I work for).
 

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maybe they are using the bridge as the return conductor. there are some MV systems that have just a single wire. I wonder why they bothered to have a ground wire inside of steel conduit.
 
synchro said:
Have you verified that it didn't have a concentric neutral surrounding the inner conductor?
Click to expand...
Example:
01200Wx1200H
 
xguard said:
In the conduit is one single conductor 1/0 35kv shielded and 1 single conductor #6, according to the original plans.
Click to expand...
A shielded cable is constructed like a coaxial cable. The shield is the grounded conductor; the #6 is the EGC.
 
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