Can I have 2 service disconnects in one structure?

[ctaylo360860]

I just wanted to thank you again so much for taking the time to look at my situation and providing me great advice. The first one line picture is what is existing on the structure right now. The second one line picture is what I’m proposing I do to make it a safer system. The following pictures are provided for insight so you can see what I’m referring to in the one lines… my questions for you are:
1- per Nec am I allowed to remove the added breakers at the double throw, set a new enclosure and use 230.46 to tap or splice on the line side of service conductors?
2- if I am allowed to use 230.46 to make two or splice on the line side of service conductors. Am I allowed to have two separate service disconnects on one structure? I would have the 3phase 200a 240 high leg service disconnect, and the 120/240 200a service disconnect. If I read correctly I would have to implant 250.64(d)(1)

If I’m not allowed to have the two service disconnects on one structure my plan is to land a 200a 3ph service disconnect in place of term box and then feed a 200a mpd from service disconect. Mpd would then feed the 3 existing panels and I would have to get a egc installed in raceway and isolate at all panels except for service disconnect.

As far as grounding and bonding goes. wherever I have my service disconnect I need to run #4 gec to metal water pipe, then bond to building the steel using #2 and #6 to ground rods sized on 250.102 (c) (1) ?

 

[augie47]

I;'m not 100% clear on the plan but, yes, you can have two disconnects fed from one service.
The problem I see is you could not feed a Main Lug panel with no disconenct/breaker ahead of it and, unless the AHJ grants you permission, you have to group the disconnects at one location.

 

[ctaylo360860]

My plan is to get rid of the two breakers in the old double throw, set a new wire way and make a splice with the 4 underground service conductors that run to building, and the 4 underground service conductors that run to the well panel.

At the building I would make another wire way out of terminal box and have 4 service conductors that run in Pvc on outside building into a 3 phase 200a main breaker as a service disconnect. I would then have another set of service conductors that run in pvc on outside of building to the 1 phase 200 amp main breaker as a second service disconnect. These panels have a walk in door between then, but are located within 6 feet or so… the main lug air compressor panel is going to go inside on a 90a 3phase breaker on the 200amp main panel. That way the conductors that run inside the entire length of building are fused. They also so ran 5 wires for that panel so I should be able to isolate grounding and grounded conductors correctly in this panel.

at the well I’m just going to be setting a 3 phase 60amp main breaker panel. This would be the third service disconnect.. the panel at the well may be bigger I just need to make sure that the service conductors that land on the main breaker are fused correctly….

 

[augie47]

That would be acceptable here but the NEC gives no specific dimensions on "grouped" so I would run it by your AHJ.
(drawing not to scale.... keep the 6'7" max height in mind)
The fact that you are feeding 2 disconnects off the one run may make the inspector require a load calculation.

 

[ctaylo360860]

I hope ahj will let me get by with it. I’m going to bring up 230.72 exception. Books says water pump but that’s essentially what the well is doing. I’m going to make the system safer than it was essentially… I got a kw report from poco for a year, and went off highest demand. Formula I used was got a max kw report from poco of 22.651x 1000= 22,651 watts
22,651 watts/ (240x1.73)= 54.58 amps I used highest demand and not the average

Yeah my drawing is not to scale, and the disconnects should be under 6’7”

Really appreciate all the help, I just want to make sure I had a good plan to propose to inspector when we do the rough for the addition walls.