Parallel feeds

[discusted electrician]

I have a 1500KVA xmfr (utility owned) supplying power to a 4000A MDP. The main feeders are underground in PVC pipe and consist of 10 conduits. The MDP is three phase. Each of the ten PVC conduits consist of just three hots and a neutral. Their is no ground in any of the ten conduits from the MDP to the xmfr. The MDP is not connected to a grounding electrode system, but is connected to building steel by means of a 3/0 copper. Since the neutral from the MDP back to the xmfr is being used as a egc, could this cause harmonic distortion and would pulling a seperate ground in all ten conduits from the MDP back to the xmfr cure this problem?

 

[iwire]

Because the transformer is utility owned you would never under any circumstances run an EGC along with the service conductors.

That would just end up in parallel with the neutral anyway.

The MDP is connected to the grounding electrode system via the building steel, assuming the other electrodes are also connected to building steel.

Further, none of that will create "harmonic distortion"

 

[steve66]

harmonic distortion is normally caused by nonlinear loads. I'm wondering why you think you have harmonic distortion?

 

[charlie]

This seems like a very similar thread to this one. I am locking it but if it should be reopened, send me a PM or another moderator can reopen it.