Bob,
The problem with switching both conductors (in a normally grounded array) is
that opening the disconnect removes the bond to ground. This takes the ground
fault protection and detection system out of the scheme (which would at least
have operated with the disconnect open on the normally
This is from the 2008 NEC
690.13 All Conductors.
Means shall be provided to disconnect all current-carrying conductors
of a photovoltaic power source from all other conductors in a
building or other structure. A switch, circuit breaker, or other
device, either ac or dc, shall not be
690.13 specifically states that the grounded conductor shall NOT be
disconnected. All sections of Chapter III (Disconecting Means) of Article
690 specifically refers to the ungrounded conductor.
Jason Szumlanski
Fafco Solar
On Fri, Sep 14, 2012 at 7:39 PM, Bob Clark bcl...@solar-wind.us wrote:
Disconnecting a normally grounded conductor would defeat the purpose of ground
fault protection and detection. If there is anything an inspector should
respect, it is ground fault protection (and 690.13).
Isaac Opalinsky
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