On a project we are working on the site work contractor cut into one conduit of a 350' underground parallel 400 amp feeder that was installed years ago. The general contractor has asked us to make the repairs.
We have repaired the conduit and upon pulling the old feeder out discovered that the #6 equipment ground installed with the 3/0 awg. phase conductors is to small. It should be # 3 awg. per my calculations.
The owner, contractor and all liable parties have understood this.
However I am having a hard time convincing them and am I correct in saying that we must also now pull out other parallel feeder (which is undamaged) because 310-4 states that all conductors must be of the same size circular mil area.
Is there an exception that I am maybe missing ?
I am refusing to repull the damaged feeder unless they approve repulling the second feeder.
We have repaired the conduit and upon pulling the old feeder out discovered that the #6 equipment ground installed with the 3/0 awg. phase conductors is to small. It should be # 3 awg. per my calculations.
The owner, contractor and all liable parties have understood this.
However I am having a hard time convincing them and am I correct in saying that we must also now pull out other parallel feeder (which is undamaged) because 310-4 states that all conductors must be of the same size circular mil area.
Is there an exception that I am maybe missing ?
I am refusing to repull the damaged feeder unless they approve repulling the second feeder.