sokbok
Member
- Location
- Kansas City
Howdy good people.
Thanks for any input. I realize this is complicated. SO THANK YOU FOR ANYTHING>
A few key things. I made diagrams of each option (see attached)
Im trying to learn about service redesign, so this is practice. Ive been under the umbrella of a large company
and evaluating if jobs like this I can take on my own.
If you ever need diagrams made like this, I am for hire.
Current service is 208Y, fed from utility XFMR to CT cab with paralleled 500MCM AL.
CT cab is very old and I think a 400/600A model. No main disconnect currently.
Currently there are (3) 200A service disconnects and an additional non-compliant 100A disconnect double lugged off one of the 200A discos load lugs.
Anyway.....Ultimately there will be 6 disconnects, with the hope that the 100A will eventually be re-fed from a 200A load center and thus allowing solar to be one of the 6. Final 6 Disconnect breakdown = (4) 200A (1) 175A (1) 100A and eventually (4) 200A (1) 175A (1) solar ~100A
Location is in Colorado and on NEC 2020.
I designed a variety of solutions both using a new 600A main disco and without a main and using six handle rule 230.90 (A) (exp 3).
Calculated load is 520A MAX.
I will meet with utility soon to evaluate if they allow 6 handle rule.
What would be cheapest ?
Option 1 - New 600A main fused disco with CSB 350-8 multitaps in a new trough. Move CT cabinet way over to make room for (2) new 200A discos (one disco fused at 160A) and new main 600A disco.
Option 2 - New 600A main fused disco and CT cabinet moved over but not as much. 2 new discos fed underground. New conduits cross over service conduits.
New conduits buried at 18" and service conduits at 36"
Option 3 - No new main disconnect. CT cabinet stays. new trough with multi taps and feed new discos overhead (shown) or underground. This is probably the cheapest and uses 6 handle rule
Option 4 - Using New 800A CT cabinet with 6 lugs on load side. No Main Disconnect. CT cabinet expensive but this could be
fairly cheap.
Option 5 - New Square D I-Line panelboard with 600A main breaker and new breakers. This could also be Eaton Powerline 3X. Try to position new panelboard to not need to run new wire to 2 older disconnects. These panelboards and breakers are crazy expensive and this is probably by far most expensive.
Thanks for any input. I realize this is complicated. SO THANK YOU FOR ANYTHING>
A few key things. I made diagrams of each option (see attached)
Im trying to learn about service redesign, so this is practice. Ive been under the umbrella of a large company
and evaluating if jobs like this I can take on my own.
If you ever need diagrams made like this, I am for hire.
Current service is 208Y, fed from utility XFMR to CT cab with paralleled 500MCM AL.
CT cab is very old and I think a 400/600A model. No main disconnect currently.
Currently there are (3) 200A service disconnects and an additional non-compliant 100A disconnect double lugged off one of the 200A discos load lugs.
Anyway.....Ultimately there will be 6 disconnects, with the hope that the 100A will eventually be re-fed from a 200A load center and thus allowing solar to be one of the 6. Final 6 Disconnect breakdown = (4) 200A (1) 175A (1) 100A and eventually (4) 200A (1) 175A (1) solar ~100A
Location is in Colorado and on NEC 2020.
I designed a variety of solutions both using a new 600A main disco and without a main and using six handle rule 230.90 (A) (exp 3).
Calculated load is 520A MAX.
I will meet with utility soon to evaluate if they allow 6 handle rule.
What would be cheapest ?
Option 1 - New 600A main fused disco with CSB 350-8 multitaps in a new trough. Move CT cabinet way over to make room for (2) new 200A discos (one disco fused at 160A) and new main 600A disco.
Option 2 - New 600A main fused disco and CT cabinet moved over but not as much. 2 new discos fed underground. New conduits cross over service conduits.
New conduits buried at 18" and service conduits at 36"
Option 3 - No new main disconnect. CT cabinet stays. new trough with multi taps and feed new discos overhead (shown) or underground. This is probably the cheapest and uses 6 handle rule
Option 4 - Using New 800A CT cabinet with 6 lugs on load side. No Main Disconnect. CT cabinet expensive but this could be
fairly cheap.
Option 5 - New Square D I-Line panelboard with 600A main breaker and new breakers. This could also be Eaton Powerline 3X. Try to position new panelboard to not need to run new wire to 2 older disconnects. These panelboards and breakers are crazy expensive and this is probably by far most expensive.
