A building like a garage or a dwelling for human occupancy?
----- Original Message -----
From: "Bill Brooks" <billbroo...@yahoo.com>
To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org>
Sent: Wednesday, March 02, 2011 11:48 PM
Subject: Re: [RE-wrenches] NEC 690.11 - Arc Fault Protection
ProvisionQuestions ?
Ryan,
690.11 refers to any system that is building mounted--usually roof
mounted,
but an awning would apply. It is not intended to deal with ground-mounted
systems unless the dc conductors penetrated a building. The intension is
that any PV system associated with a building where people are located
would
have this extra safety.
Bill.
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Ryan J
LeBlanc
Sent: Wednesday, March 02, 2011 11:10 PM
To: re-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] NEC 690.11 - Arc Fault Protection Provision
Questions
?
Wrenches,
NEC 2011, 690.11 says, "PV Systems with DC source Circuits, DC output
Circuits, or both, on or penetrating a building...at over 80V... Shall be
protected by a listed (DC) arc fault circuit interrupter, PV type, or
other
system components listed to provide equivalent protection." and then it
goes
on to say what the arc fault should do.
My questions are:
1) What does "on" mean?
On the roof? attached to the wall? Say the array is in a field, with
combiner boxes having PV output circuits run underground and stubbed up
into
the bottom of a DC disconnect mounted to the side of a house. The conduit
is strapped to the side of the house on it way up to the bottom of the
disconnect switch. Is this "on" the building?
2) What is a "building"?
Is it a dwelling, small and large commercial buildings? How about an
enclosed MW in a box solution in the middle of a MW power plant, is that a
building? I like for example that in the 600V max limitation that it
specifies 1 or 2 family dwellings, leaving small & large commercial
buildings opportunity to have 1000V systems.
Any clarification from Bill Brooks, Matt Lafferty, David Brearly, or the
host of other awesome PV Guru's on the list is extremely appreciated.
~Ryan L
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