[RE-wrenches] NEC 690.11 - Arc Fault Protection ProvisionQuestions ?

Joel Davidson joel.davidson at sbcglobal.net
Thu Mar 3 07:04:57 PST 2011


A building like a garage or a dwelling for human occupancy?

----- Original Message ----- 
From: "Bill Brooks" <billbrooks7 at yahoo.com>
To: "'RE-wrenches'" <re-wrenches at 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-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Ryan J
> LeBlanc
> Sent: Wednesday, March 02, 2011 11:10 PM
> To: re-wrenches at 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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