Multiple Service Disconnects fed from one Service Lateral?

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ronlow00

Member
Location
Minnesota
Here is the scenario I am looking at:
1) A service lateral from the utility tranformer is feeding a CT cabinet. The CT cabinet does not have an disconnect or a O.C. device. Lugs are provided at the CT cabinet to allow for the termination of multiple tap feeder conductors.
2) 3 panelboards are fed from the CT cabinet. Each panelboard has a main breaker and are to be used as service disconnects.
Panel A ? 225A Breaker ? Load of 90A
Panel B ? 400A Breaker ? Load of 305A
Panel C ? 400A Breaker ? Load of 310A
Total Load ? 705A
3) CT Cabinet will be mounted on the building exterior. Panelboards will be mounted inside the building.
4) Distance from CT cabinet to furthest panelboard is less than 25?.
5) All 3 panelboards are mounted next to each other.

Questions:
1) Can the three panelboards be fed from the CT cabinet without a disconnect or OC device ahead of the taps? (Each panelboard would have it's own feeder conductors back to the CT cabinet)
2) Since the load is 705A, can the service lateral be sized for 800A?
3) Can the feeders from the CT cabinet to the Panelboards be sized per the Main Breaker at each respective panelboard or do the feeders need to be sized 800A as well?

I can post a sketch if you would like to see a visual.
 

shortcircuit2

Senior Member
Location
South of Bawstin
Info here is a bit different from similar post you made.

Wiring to the 3 panelboards would be "Service Entrance Conductors"...not "Feeders".

Unless you intend to run them that 25 feet "Inside" the building? Then you will have to put a main disconnect outside or nearest the entrance inside...and then wire the 3 panelboards as feeders.

There is some information missing that is important to how the service is done.
 
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