bphgravity
Senior Member
- Location
- Florida
I need some opinions on a proposed service arrangement at a daycare facility in my jurisdiction.
The plans show a 600A meter outside served with 2 sets of 350kcmil conductors from the utility transformer. From the meter, the service conductors run underground to an equipment room inside the building. The 2 sets of 350kcmil terminate in a wireway below two 400A MCB panelboards. From the wireway, one set of 300kcmil conductors are tapped to serve each of the 400A main panels. The calculated load at each main is 250A.
1. Does this arrangement violate 230.70(A)(1)? I say yes.
2. Does this arrangement violate 230.90(A)? I say yes. While Exception #3 may apply to the 800A worth of service overcurrent protection, I don't feel this exception can be used for the 300kcmil taps to the 400A mains.
Any thoughts?
The plans show a 600A meter outside served with 2 sets of 350kcmil conductors from the utility transformer. From the meter, the service conductors run underground to an equipment room inside the building. The 2 sets of 350kcmil terminate in a wireway below two 400A MCB panelboards. From the wireway, one set of 300kcmil conductors are tapped to serve each of the 400A main panels. The calculated load at each main is 250A.
1. Does this arrangement violate 230.70(A)(1)? I say yes.
2. Does this arrangement violate 230.90(A)? I say yes. While Exception #3 may apply to the 800A worth of service overcurrent protection, I don't feel this exception can be used for the 300kcmil taps to the 400A mains.
Any thoughts?