jtb
Senior Member
- Location
- Pennsylvania
I got an email about another questionable design.
Let me clarify that I am now the Electrical Designer responsible, as the original engineering firm has broken up.
The one-lines (verified in field) have an 800A disconnect with 800A fuses feeding dual 500kcmil/phase feeders to a 600A MCC.
The MCC was extended with 1/0 THHN by the electricians in the field. Unsure if this was
part of the engineering design.
Obviously several potential problems here, and like other instances during this same project, I have inherited some bad design issues and must correct them, as well as take the blame (I am sure all of us have had the pleasure).
My question is Code References! I have scanned through the NEC Handbook for applicable violations. I need more detail to verify compliance with Tap rules 240.21, but also need Code references for the other potential problems like inadequate protection of the MCC. I am searching as I write this, for those who think I am not trying.
I wouldn't ask if time was available to research on my own, and I apologize if you see me as taking advantage of your knowledge. If so, don't answer. My sincere gratitude for those who do.
Let me clarify that I am now the Electrical Designer responsible, as the original engineering firm has broken up.
The one-lines (verified in field) have an 800A disconnect with 800A fuses feeding dual 500kcmil/phase feeders to a 600A MCC.
The MCC was extended with 1/0 THHN by the electricians in the field. Unsure if this was
part of the engineering design.
Obviously several potential problems here, and like other instances during this same project, I have inherited some bad design issues and must correct them, as well as take the blame (I am sure all of us have had the pleasure).
My question is Code References! I have scanned through the NEC Handbook for applicable violations. I need more detail to verify compliance with Tap rules 240.21, but also need Code references for the other potential problems like inadequate protection of the MCC. I am searching as I write this, for those who think I am not trying.
I wouldn't ask if time was available to research on my own, and I apologize if you see me as taking advantage of your knowledge. If so, don't answer. My sincere gratitude for those who do.