House Panel

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dvcraven0522

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St. Louis, Missouri
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Engineer
I have a 200amp house panel with FP tap. Inspector in requiring the service to the house must be 400amp. I agree with him.

My question does anyone have a solution in lieu of busting up concrete and running new conduit/wire. See attached one line. I suggest a shunt trip the main in the house panel in the event the FP comes on but contractor tell the lead times are 30 weeks.

I cannot run parallel feeders large enough in the exiting 2-1/2' pvc for 400amps.

Cost 30k to fix each location. This occurs on the 3 building.

Thx
Dan Craven
 

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  • 21-09-29-Riverport1,2,& 3 Elec-RP1 E1.0.pdf
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What's the breaker in the main? Is it something a shunt trip can be added to or do you have to replace the breaker? Which of those was the contractor quoting 30 weeks for?
 
Has the fire pump and controller and tap already been purchased? Was a diesel fire pump ever an option? -I don't know how that would compare cost wise.
 
Seems to me that we need to see all the calcs. The issue the as I understand the OP is the service conductors and the CT can are too small. With the existing 2.5" conduit you could maybe get 3 350 and a reduced neutral. Can the house loads somehow get down low enough to use less than a 200 amp main? Some math will be in order to see if this can be creatively made to work with the 2.5" conduit. I don't think this is a lost cause until all the math is worked out.
 
Last edited:
Todd0x1 said:
Has the fire pump and controller and tap already been purchased? Was a diesel fire pump ever an option? -I don't know how that would compare cost wise.
Click to expand...
From my experience a diesel FP should be an absolute last resort. They are very expensive, lead to other requirements, and are very costly to own.
 
texie said:
Seems to me that we need to see all the calcs. The issue the as I understand the OP is the service conductors and the CT can are too small. With the existing 2.5" conduit you could maybe get 3 350 and a reduced neutral. Can the house loads somehow get down low enough to use less than a 200 amp main? Some math will be in order to see if this can be creatively made to work with the 2.5" conduit. I don't think this is a lost cause until all the math is worked out.
Click to expand...
The only house loads he is showing is the transformer that's about 36 amps and a small pump. Maybe there are other loads on that panel he's not showing.
 
texie said:
Seems to me that we need to see all the calcs. The issue the as I understand the OP is the service conductors and the CT can are too small. With the existing 2.5" conduit you could maybe get 3 350 and a reduced neutral. Can the house loads somehow get down low enough to use less than a 200 amp main? Some math will be in order to see if this can be creatively made to work with the 2.5" conduit. I don't think this is a lost cause until all the math is worked out.
Click to expand...
could get (6) 1/0 copper in the PVC.
 
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