Sizing a junction box

[ctaylo360860]

I have to run some underground over to a remote distribution panel in a house. My plan is to set a j box on the rim joist and want to make sure I have it sized correctly.

I will be running - 1/0,1/0,1/0 aluminum triplex with a #8 copper egc inside of 2”pvc from 100 amp breaker inside a 200a service disconnect to a 16”x16”x6” j box. I planned on punching a hole in the rim joist coming out the back of the box with a connector and switching to 1/0,1/0,1/0,#2 ser aluminum and getting it inside the existing 100amp panel through the crawl space…

This will be and angle pull with 2” being the largest raceway

I believe 314.24 explains the j box doesn’t need to be bigger than 6x the largest raceway entering the box. So my minimum size would be 6x2”=12”

Looks like I could use a smaller box but don’t want to have trouble putting the cover on. Does this seem like I have an accurate understanding or have I missed something ?

Any and all help is appreciated greatly thanks!

 

[LarryFine]

Won't an external disconnect be required? Make the transition there.

 

[ctaylo360860]

Won't an external disconnect be required? Make the transition there.

There is 200a service disconnect after the poco meter that feeds 200a main lug rdp on the pole, and I’m going to feed the house from the a 100a circuit breaker inside of the main lug 200 amp rdp….

 

[ctaylo360860]

Won't an external disconnect be required? Make the transition there.

Sorry my drawin skills aren’t the best but this is what I’ve got….

 

[LarryFine]

How far is the run from the pole to the house?

I still thing you need "nearest point of entry" compliance.

 

[ctaylo360860]

How far is the run from the pole to the house?

I still thing you need "nearest point of entry" compliance.

Maybe 75ft definitely within site of the front door or the house.

 

[ctaylo360860]

Maybe 75ft definitely within site of the front door or the house.

 

[augie47]

Note that 225.32 states: "The disconnecting means shall be at a readily accessible location nearest the point of entrance of the conductors". not the entry of the building.

 

[ctaylo360860]

Note that 225.32 states: "The disconnecting means shall be at a readily accessible location nearest the point of entrance of the conductors". not the entry of the building.

So looks like my plan and j box size should work?

 

[augie47]

So looks like my plan and j box size should work?

Only if you limit the length of the SER run to the minimum once it enters the building.(some jurisdictions limit it to 3 ft)
I would look at the possibility of installing the conduit to the panel (again shortest interior distance) and eliminating the splice.

 

[ctaylo360860]

Only if you limit the length of the SER run to the minimum once it enters the building.(some jurisdictions limit it to 3 ft)
I would look at the possibility of installing the conduit to the panel (again shortest interior distance) and eliminating the splice.

It’s about 25ft from j box to panel, and the ser should be fused off a 100a breaker from the pole. The inside panel sits on the left side of the door. that was the original plan until the contractor poured concrete steps blocking the panel box…. They just about poured the concrete sidewalk around the house too until I stopped them

 

[augie47]

again, all I can tell you is what 225.32 stastes:
The disconnecting means shall be at a readily accessible location nearest the point of entrance of the conductors"
25 ft of SER from the point of entry of the conductors to the panel would not be allowed in most jurisdictions.

 

[ctaylo360860]

View attachment 2574114
again, all I can tell you is what 225.32 stastes:
The disconnecting means shall be at a readily accessible location nearest the point of entrance of the conductors"
25 ft of SER from the point of entry of the conductors to the panel would not be allowed in most jurisdictions.

Thanks you guys for the Input, and the code articles I will do some reading and see if I can meet some of the exceptions, but it looks like I may have to just set another panel with a main breaker on the outside and feed the existing panel from there….

 

[ctaylo360860]

Only if you limit the length of the SER run to the minimum once it enters the building.(some jurisdictions limit it to 3 ft)
I would look at the possibility of installing the conduit to the panel (again shortest interior distance) and eliminating the splice.

They really messed up my plans here with there stairs….

 

[LarryFine]

They really messed up my plans here with there stairs….

If you have an outside disconnect, it can be elsewhere, and the feeder can be any necessary length.

 

[ctaylo360860]

View attachment 2574114
again, all I can tell you is what 225.32 stastes:
The disconnecting means shall be at a readily accessible location nearest the point of entrance of the conductors"
25 ft of SER from the point of entry of the conductors to the panel would not be allowed in most jurisdictions.

I know you beat the hell out of this horse already, but I want to make sure I understand correctly. So essentially if I put a 100a main breaker panel on the outside of the house, then get down into the basement and re feed the existing 100amp breaker inside the panel inside the house. I should be compliant with 225.32?

So basically I have a 200a service disconnect fed from poco meter at the utility pole.

This 200amp service disconnect feeds a main lug 200 amp panel on the other side of utility pole.

I then run feeders from a 100a circuit breaker that's inside the 200a main lug panel at utility pole into the outdoor 100amp main breaker panel on the outside of the house.

Then run another set of feeders from this 100 amp outdoor panel into the inside 100 amp existing panel….

Second picture is the outdoor panel located on the outside of the house…

 

[ctaylo360860]

If you have an outside disconnect, it can be elsewhere, and the feeder can be any necessary length.

There is an outside disconnect at the utility pole, but looks like that won’t meet code because of the 225.32?

So basically I just need to set another panel with a disconnect on the outside of the house which will go through the basement and feed the existing 100 amp panel inside…

 

[augie47]

That would be Code compliant

 

[don_resqcapt19]

In my opinion, 225.30 will require you to bring a single 200 amp feeder to the building.

 

[LarryFine]

There is an outside disconnect at the utility pole, but looks like that won’t meet code because of the 225.32?

Apologies. I meant anywhere on the outside of the house, not necessarily back-to-back with the panel.

Only having the main disco inside triggers the nearest-point-of-entrance (of conductors) requirement.

So basically I just need to set another panel with a disconnect on the outside of the house which will go through the basement and feed the existing 100 amp panel inside…

Yes, outside or immediately inside. This is what I meant that can double as the wiring-method interface.

Remember to maintain neutral isolation from grounding and electrodes (yes, electrodes are required).