2005 code question [RE-wrenches]

Damian de Caires damian at thesolarcenter.com
Thu Jul 20 05:28:29 PDT 2006


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If your area has not yet adopted the 2005 you need to get approval from
your local inspector because in the 03 code a disconnect is required in
attic and a permanent staircase must be provided to attic, and I asked
John Wiles if a fold down staircase was applicable and he said no it has
to be a fixed permanent staircase.  If you are running through a
building I suggest metal raceway and dc fusing in attic so that there is
no unprotected high voltage dc lines in building.  But in your case I
would say use the permanent staircase argument with the architect I've
used it before and customers back down really quickly when they hear
that.   

-----Original Message-----
From: Bob-O Schultze, Electron Connection
[mailto:econnect at snowcrest.net] 
Sent: Thursday, July 20, 2006 12:24 AM
To: RE-wrenches at topica.com
Subject: Re: 2005 code question [RE-wrenches]

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On Jul 18, 2006, at 8:48 PM, Jeff Yago wrote:

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>
> Installing higher voltage array grid tie system.  Normally we route  
> from fused array combiner to inverter down outside wall to exterior  
> dis-connect (no fuses), then to interior inverter(s).   Client's  
> architect vetoed exterior conduit and wants to route through roof  
> and down inside exterior wall to above described exterior dis- 
> connects at ground level.
>
> We have been designing to 2005 code although this county still  
> using older code.  New section 690.31 (E)  "Where direct-current pv  
> output circuits are run inside a building, they shall be contained  
> in metallic raceways from point of penetration to first accessible  
> dis-connect."
>
> also,
>
> Section 690.14 (C) 5. Grouping. "The pv dis-connecting meansshall  
> be grouped other dis-connecting means....."
>
> Question - Does this require Intermediate Threaded Metal Conduit or  
> is EMT allowed?
No problem
> How about conduit above roof line?
No problem as long as you support it correctly
>
> Question - I think inspector may ask us to move the DC array dis- 
> connect from back of house to side where meter base and AC dis- 
> connect are located due to above.  Does this mean up to 6 array dis- 
> connects shall be grouped together, or ALL power source dis- 
> connects to house grouped together?
Here in Oregon, we are required to put an ac disconnect for the PV  
system within 10' of the meter. An archaic, redundant rule as UL and  
IEEE require the inverter to power down in an outage, linemen working  
on the feeders would either pull the feeder fuse or ground the lines  
in any case and just ignore it anyway, but there it is.
However, even in the worse case, just put in a second ac disco. One  
at the output of the inverter and one near the meter. $35.00 or so.  
Big deal. That way you keep the DC and ac discos at the inverter  
where they belong.
Bob-O
>
> Thanks,
> Jeff Yago
>
>
>
>
> _____________________________________________________________
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