[RE-wrenches] Minimum bus size, new requirements

[Ray Walters]

So to be clear, the inspector is wrong:  it is NOT an NEC requirement.  
It is only a California requirement.   NEC 2023 only requires a 100 A 
main load center and disconnect per 225.39(C). Further, 710.15(A) allows 
the inverter and feeder to the Load center to be even less in off grid 
applications.   The rest of us in the other 49 states are Not required 
to comply with the 200 A requirement.


Good Luck out there.


Thank you,


Ray Walters
Remote Solar



On 3/28/2024 12:33 PM, Lloyd Hoffstatter via RE-wrenches wrote:
> William,
>
> Here is the CA Energy Code with the upsized busbar requirements under 
> solar / ess readiness:
>
> https://title24energyreports.com/articles/basic-facts-changes-2022-energy-code.php
>
> Best regard
> Title 24: 2022 Energy Code - Basic Facts | CompuCalc 
> <https://title24energyreports.com/articles/basic-facts-changes-2022-energy-code.php>
> Summary of changes and updates in the 2022 California Energy Code
> title24energyreports.com
>
>
>
> Lloyd Hoffstatter, M.S. Applied Solar Energy
>
> Inaugural NABCEP Cetrified PV Installer Emeritus
>
> Director, Sunstruck Consulting
>
> lloyd at sunstruckconsulting.com
>
> 845-657-8132 (office)
>
> 914-844-3404 (cell)
>
> ------------------------------------------------------------------------
> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on 
> behalf of William Miller via RE-wrenches 
> <re-wrenches at lists.re-wrenches.org>
> *Sent:* Thursday, March 28, 2024 1:00 PM
> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
> *Cc:* William Miller <william at millersolar.com>
> *Subject:* [RE-wrenches] Minimum bus size, new requirements
>
> Friends:
>
> A local building official recently wrote this:
>
> This is to comply with the new codes (California Energy Code and the 
> Nation Electric Code) that require this minimum buss rating regardless 
> of the service size or main size.
>
> The new code allegedly requires a minimum bus rating of 225A in all 
> new services of 200A rating or less.
>
> Do any of you know what new code this might be?
>
> Thanks in advance for your time.
>
> William
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com 
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.millersolar.com_&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=p2tHyHEAjVe2zSh4C_236V4KkHnn0z0ynUvWz0mobds&m=9uejohzp8xlaOjgzFRzK5pSkQX5Jtrq-KM0zg-kn9sGvQF-Ezmo9hA2K0hbNA1ns&s=7RIp61FIGVkUrnLeJuaaLlwwPwqGeMEQXVgB04GNECk&e=>
>
> CA Lic. 773985
>
>
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