Sizing main and system bonding jumpers

[ctaylo360860]

Hey I’m back to make sure I haven’t overlooked anything or Mia calculated in my plans. Again any and all help is greatly appreciated.

I want to supply two separate structures from a wire way. Wireway will be supplied with 2 parallel runs of 3/0 copper. I’m planning on running 3/0 copper to each structure from the wire way.

Each structure will have a 200a service disconnect on the outside of the building.

All raceways will be pvc underground.

I will bond service disconnects using green screw provided from manufacturer.
I will run #4cu gec to water main and jump back outside to aground rod with #6 cu “if no water or other present electrodes I will set (2) ground rods and run #6cu

1st ? Would I be able to get the service disconnects inside?
Thought was lb from outside of each building right into the back of a panel inside or would that be a violation of 230.3 ?

2? Will my wireway need to be bonded?
If so looks like I would calculate using 250.102(c)(1)?
3/0cu=178.2x2=345.6mm2>350kcmil=1/0cu ssbj

3? Does my wireway need a gec as shown in exhibit 250.12 “see 2nd picture” or is this just another way to complete the grounding electrode system? If so I’m guessing it would be based in 250.66 which should be basically same formula above giving you 1/0cu

 

[ctaylo360860]

Exhibit 250.12

 

[augie47]

1st ? Would I be able to get the service disconnects inside? As far as the NEC is concerned, yes
Thought was lb from outside of each building right into the back of a panel inside or would that be a violation of 230.3 ?

2? Will my wireway need to be bonded? Yes
If so looks like I would calculate using 250.102(c)(1)?
3/0cu=178.2x2=345.6mm2>350kcmil=1/0cu ssbj Agree

3? Does my wireway need a gec as shown in exhibit 250.12 “see 2nd picture” or is this just another way to complete the grounding electrode system? If so I’m guessing it would be based in 250.66 which should be basically same formula above giving you 1/0cu No GEC needed

What about metering ??

 

[ctaylo360860]

What about metering ??

If I understand 230.3 and 230.6 i would be in violation if I ran a nipple from outside building into panel. Maybe I am interpreting 230.3 230.6 wrong?

Poco will set up a ct meter next to transformer. All owned by the same company so they are not worried about seperate metering.

 

[augie47]

Prior to the 2020 requirement for residential "emergency" disconnects, interior service panels were commonplace and not a violation of the Sections you mentrioned

 

[ctaylo360860]

Prior to the 2020 requirement for residential "emergency" disconnects, interior service panels were commonplace and not a violation of the Sections you mentrioned

Thanks for the replies. Maybe I am over thinking this.
Buildings are considered commercial.

So I should be able to run unfused service conductors from wireway to and lb at each building, and nipple right into panel? With out violations?
Or do I have to follow the rules of 230.6

 

[augie47]

You obviously have to follow 230.6 but I fail to see any violation as long as your service conduits are "outside" except for the short nipple thru the wall to your panel per 230.70

 

[ctaylo360860]

You obviously have to follow 230.6 but I fail to see any violation as long as your service conduits are "outside" except for the short nipple thru the wall to your panel per 230.70

I believe that I’m overthinking 230.3 I won’t have any service conductors supplying a building or other structure passing through the interior of another building or structure. They will only pass into the interior of the building through maybe a 4inch Nipple. So I shouldn’t have to use 230.6. I should be able to run service conductors to interior service disconnect at each building. Thanks again for the replies