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240.86(A) - Q on series combination equipment

Question asked by chiefns830 on Sep 23, 2019
Latest reply on Sep 27, 2019 by chiefns830

I have a situation where a 1200-amp 3PH 208/120 service

is being replaced by a 1200-amp 3PH 480/277 service.

 

This change has produced larger fault currents and many of the downstream panelboard (subpanels) are rated at only 10kAIC; the calculated fault-current that is being shown at the subpanels is way over.

 

These plans are signed and sealed by an electrical engineer with a note,

"THE CONTRACTOR SHALL PROVIDE A SERIES-RATED SYSTEM, OR IF THIS CANNOT BE DONE, THE CONTRACTOR SHALL REPLACE PANELS WITH 22k AIC RATED PANELS."

 

Does anyone else find this highly irregular, since the code requires the EE to design series rated system?

Would you accept or reject this plan note?

Any comments will be appreciated.

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