[RE-wrenches] Equipment for 400 Amp Service Supply Side & 2 200s

Tue Mar 29 15:49:35 EDT 2022

In this case, we would just do a feeder tap on the feeder that comes
straight from the main breaker (not the feeder that comes from the
feed-through lugs) and install a 200A circuit breaker on the load side of
the PV interconnection.

If your utility does not require a utility-accessible disconnect switch,
you can just do the feeder tap in the subpanel that comes directly from the
service disconnect and install a main breaker in the subpanel.

See attached diagrams.

Square D makes a CSED that has two 200A disconnects PLUS a 200A bus with up
to four 2-pole service disconnects (this bus is not a feed-through).
However, those 2-pole disconnects can only be a maximum of 125A each. If
you have a smaller system, these breaker positions work well in many
circumstances, but the 120% rule or sum of breakers rule may come into play
for the bus. Technically this is a bit of a gray area, because this bus is
not protected at all by a primary supply OCPD, so it's not specifically
addressed in the code. This really isn't a "load side" interconnection -
your AHJ may consider each breaker position a line side interconnection
(since each breaker is a service disconnect) and none of the load side
provisions apply. Or they may say the intent of the code is to protect the
bus and apply the load side requirements. You could presumably split your
system into two systems and feed two 100A breakers on this bus and meet the
rapid shutdown requirement, especially if there are no other loads on the
bus (sum of the breakers rule).

Jason Szumlanski
Florida Solar Design Group

On Tue, Mar 29, 2022 at 2:59 PM August Goers via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Hi Jeff -
>
> There is no particular supply side connection location on this panel - I
> think if you needed that it is best to go with the Siemens part that
> Vincent sent over.
>
> However, you could use the sum of all breakers rule on the internal bus
> and install up to 200 A of solar breakers in the panel. Then, use the other
> 200 A main breaker to feed your loads. If your loads are larger than 200 A,
> I suppose this won't work.
>
> August
>
>
> On Tue, Mar 29, 2022 at 11:43 AM Jeff Clearwater <
> jeffc at villagepowerdesign.com> wrote:
>
>> Thanks August yes but am I missing where you put the third tap for the PV
>> backfeed?  I need 2 x 200 amp mains plus a 200 amp pv backfees point and
>> the meter needs to have test bypass links.
>>
>> Sent from my iPhone
>>
>> On Mar 29, 2022, at 10:34 AM, August Goers <august at luminalt.com> wrote:
>>
>> 
>> Hi Jeff -
>>
>> There are several 400 A (or 320 A continuous) meter/mains on the market
>> with 2 x 200 A breakers. In the Bay Area these are frequently referred to
>> as "California 400" panels, even though they are installed with a self
>> contained 320 A rated utility meter, rather than a 400 A CT-meter. They are
>> great for systems with large energy storage, because one 200 A breaker can
>> feed non-backup loads and the other 200 A breaker can feed backup loads and
>> solar.  Anyway, here's one such example:
>>
>> https://www.milbankworks.com/products/catalog/M400-UG-APS-LC
>> <https://mailtrack.io/trace/link/3910960843ccf9824afeb60069479de60bb0ff88?url=https%3A%2F%2Fwww.milbankworks.com%2Fproducts%2Fcatalog%2FM400-UG-APS-LC&userId=1613865&signature=71a10799e664d2b5>
>>
>> Best,
>>
>> August
>> Luminalt
>>
>>
>> On Tue, Mar 29, 2022 at 10:15 AM Jeff Clearwater via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> Good Day Wrenches,
>>>
>>> Does anyone know of a 400 Amp Meter/Main that can accomplish the
>>> following?
>>>
>>> 1)  Provide 2 x 200 Main Breakers for Loads
>>> 2) Provide an easy supply side tap point for 160 Amps of Grid-tie Solar
>>> (so basically a 200 Amp backfeed)
>>>
>>> I'm considering using an Eaton 324 N
>>> <https://mailtrack.io/trace/link/f56d44501c53a22d6d09c73085462103942b7e81?url=https%3A%2F%2Fwww.rexelusa.com%2Fp%2F525405%2Featon-b-line%2F400a-4p-4-jaw-meter-socket%2F782051622102%2F324-n&userId=1613865&signature=adb5dc688c6b5bbd>
>>> (Eaton B-Line 324 N 400A, 320 A cont. 4P, 4 Jaw, Meter Socket W Link Bypass
>>> Facilities) but I'm not sure I can double lug it and then also tap off of
>>> one of the 200 Amp lines with another tap (using Ilsco IPC-250-4/0
>>> <https://mailtrack.io/trace/link/94bf932828dc23659f7504cb03f4995654d0c503?url=https%3A%2F%2Fwww.ilsco.com%2FIlsco%2Fccrz__ProductDetails%3Fsku%3DIPC-250-4%252F0-ILSM-ILS%26cclcl%3Den_US&userId=1613865&signature=3d4ed17d7123dfa6>
>>> splice connectors).
>>>
>>> Thanks!
>>>
>>> Jeff
>>>
>>>
>>> ~~~~~~~~~~~
>>> Jeff Clearwater
>>> linkedin
>>> <https://mailtrack.io/trace/link/f037be22c035a02753aae8160864ea84b58cb872?url=https%3A%2F%2Fwww.linkedin.com%2Fin%2Fjeff-clearwater-0622a312%2F&userId=1613865&signature=1fa6e87c15858f46>
>>>
>>
>
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