[RE-wrenches] breaker instead of fused disco

[Gary Willett]

Jerry:

I don't know about PG&E, but here in Texas, a VLLD (Visible Lockable 
Labeled AC Disconnect) is required for the PV system AC disconnect. They 
want to see a switch on which it can be seen that it is off with the 
dead-front cover closed, and that can be locked-out using their lock in 
the off position. These requirements usually are fulfilled with a knife 
switch type disconnect.

The PV system AC disconnecting means has to have an SCCR (short circuit 
current rating, in kA) that will handle the same available short circuit 
current as the main service disconnecting means. Usually, that's readily 
achievable with fuses.

It may be possible to mount a service entrance rated circuit breaker in 
a dedicated enclosure (visible/lockable) if PG&E says OK. But then you 
may run into NEC 110.10 listing issues unless the enclosure's SCCR is 
based on assembly testing by a NRTL to UL 508A.


Regards,

Gary Willett
Icarus Engineering / Solar Services LLC


On 10/3/17 12:21 PM, Jerry Caldwell wrote:
> Dear Wrenches with experience in PG&E territory:
> I'm installing a system with a line side tap.  Can I use a small subpanel with room for only one circuit breaker instead of a fused disconnect?  The NEM application, step 2 requires you to select a fused disconnect from their list of approved devices.  Does anyone have experience with PG&E granting a variance on this requirement?
>
> Thanks in advance.  Any help is appreciated.
> Jerry Caldwell510.205.2798
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
>