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
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