[RE-wrenches] DC Disconnect for first responders

[James Jarvis]

Did they ever explain why they were requiring it on a nominal 48 volt
system? NEC 480.7(B) (from memory, I think that is the right article) says
it is for nominal voltage of 60 volts or higher. IE your 48 volt system is
exempt.

Jay pointed this out on February 3rd.


-James Jefferson Jarvis
APRS World, LLC
+1-507-454-2727
http://www.aprsworld.com/


On Mon, Feb 20, 2023 at 12:36 PM William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Friends:
>
>
>
> Here is how this resolved for my upcoming project:  I submitted a request
> to the building department to waive the requirement for a DC disconnect. I
> based the justification on the need to keep a pressure pump for the fire
> sprinklers and a fire alarm operational.  I will supply an external AC
> disconnect to de-energize all premise wiring except those circuits
> mentioned above.  The request was granted.
>
>
>
> William
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
>
>
>
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