Re: [RE-wrenches] Line Side Tap

2023-10-13 Thread Christopher Warfel via RE-wrenches 
The intent of the line side tap, was to allow larger pv systems to 
interconnect to the SE conductors and not have to consider the service 
panel. So, I agree with others that the service panel has no 
consideration for what you are doing. The panel is protected by the MSP 
Breaker.  Chris


On 10/12/2023 8:06 PM, Drake Chamberlin via RE-wrenches wrote:
We have a design where the conductors will come out of a 400 A meter 
base to a junction box. Splices in the box will allow for the PV to 
feed the meter.

A maximum of 312 Amps can come from the inverters to feed the grid.

The loads on the existing main service are significantly less than 
200A. The service is rated at 200 A, 3 phase delta.




The conductors from the meter would be rated at 400 A to the splice, 
as would the conductors to the photovoltaic system. The conductors to 
the existing service would be downsized to 200 A.


We were told that the bus bar rating of the service must also be 400 
A, even though the output of the PV does not feed through that box. Is 
there a rule that says this? What would be the logic?

Thank you,
Drake

/Drake Chamberlin/

/Athens Electric LLC/

/Ohio Electrical Contractor’s License 44810/

/NABCEP Certified PV Installation Professional/


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            Christopher Warfel
                 ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
                                401-466-8978


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Re: [RE-wrenches] Line Side Tap

2023-10-13 Thread david quattro via RE-wrenches 
Dana in your first example it looks like 120A of solar is pushing onto a
100A utility meter, over #3 copper which cannot handle 120A. But I might be
missing something.




On Fri, Oct 13, 2023 at 6:29 AM Dana Orzel via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Repost of 2 types of interconnection: this was for  dealing with a 100A
> service. Definitely the opposite of a 400A but I hop[e applicable.
>
>
>
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Re: [RE-wrenches] Line Side Tap

2023-10-12 Thread david quattro via RE-wrenches 
Drake I think you’re right and they’re wrong, as long as the 200A bus is
protected by a 200A breaker, and as long as the Utility meter and utility
conductors remain 400
David




On Thu, Oct 12, 2023 at 5:06 PM Drake Chamberlin via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> We have a design where the conductors will come out of a 400 A meter base
> to a junction box. Splices in the box will allow for the PV to feed the
> meter.
>
> A maximum of 312 Amps can come from the inverters to feed the grid.
>
> The loads on the existing main service are significantly less than 200A.
> The service is rated at 200 A, 3 phase delta.
>
>
>
>
> The conductors from the meter would be rated at 400 A to the splice, as
> would the conductors to the photovoltaic system. The conductors to the
> existing service would be downsized to 200 A.
>
> We were told that the bus bar rating of the service must also be 400 A,
> even though the output of the PV does not feed through that box. Is there a
> rule that says this? What would be the logic?
>
> Thank you,
>
> Drake
>
>
> *Drake Chamberlin*
>
> *Athens Electric LLC*
>
> *Ohio Electrical Contractor’s License 44810*
>
> *NABCEP Certified PV Installation Professional*
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[RE-wrenches] Line Side Tap

2023-10-12 Thread Drake Chamberlin via RE-wrenches 

We have a design where the conductors will come out of a 400 A meter
base to a junction box. Splices in the box will allow for the PV to feed
the meter. 

A maximum of 312 Amps can come from the inverters to feed the grid. 


The loads on the existing main service are significantly less than 200A.
The service is rated at 200 A, 3 phase delta. 


The conductors from the meter would be rated at 400 A to the splice, as
would the conductors to the photovoltaic system. The conductors to the
existing service would be downsized to 200 A. 


We were told that the bus bar rating of the service must also be 400 A,
even though the output of the PV does not feed through that box. Is
there a rule that says this? What would be the logic? 

Thank you, 

Drake 

_Drake Chamberlin_ 

_Athens Electric LLC_ 

_Ohio Electrical Contractor's License 44810_ 


_NABCEP Certified PV Installation Professional
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[RE-wrenches] line-side tap in subpanel

2010-07-22 Thread Erika M. Weliczko 
Greetings all,

When the subpanel is fed with 380A wire and the OCD is 400A and the panel
bus is 400A, which number would be used for determining 120% capacity?

I'm thinking the 400A because the bus would be overfed before the wire?

So if we want to land 225A of OCD for solar output on the line terminals or
a backfed breaker, we need to derate existing OCD to subpanel all the way to
255A, or realisitically 250A if the load calcs allow it.

Or replace the feeders serving the subpanel. Yeah, right.

 

While for this one it does not end up mattering, it raises the question.

 

Thanks for input,

Erika

 

 

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