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Corner Grounded Wye?

Corner Grounded Wye?

Corner Grounded Wye?

(OP)
I have a client that operates a large distribution facility in the US (approx.800,000 sq. ft.).  The service is fed from a 12.47kV/480V padmounted transformer that is wound delta/wye.  The service is 3 wire with B phase grounded.  The grounding strap from x0 to the tank was not removed when the service was initially energized--it removed itself in a flash of smoke and fire during this process.  This is a "standard" configuration for the serving utility.

Now, the question.  The customer has an 8" ductile iron water service for potable water and fire protection.  Although the building is only eight years old, the piping system has failed (ruptured) three times.  The repairing plumbing contractor indicates that the piping is corroded to the point that "..it looks to be a hundred years old".  The piping is bonded to the ground bus of the switchboard that serves the facility.  Can anyone postulate a scenario that would indicate that the service configuration might be contributory to the corrosion mechanism?  Thanks for any input or guidance.

Dave

RE: Corner Grounded Wye?

(OP)
resqcapt19,

Thanks for the references.

Dave

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