Hi Dan OK I'll bite. 1. By mechanical do you mean passive or active air movement?
2. If by hazardous you mean a hydrogen explosion, correct? Thanks Jay Peltz power Sent from my iPad On Dec 14, 2011, at 4:46 PM, <[email protected]> wrote: > I've mentioned it in the past, and got the impression it went over like a > fart in church, but it seems to me buttoning up a battery box tighter than a > bull's ass in fly season, and (hoping) mechanical ventilation mitigates this > creation of a hazardous environment creates a Class I, Division 2 location. > (NEC 500.5 (B)(2)(2)). > Any takers? > db > > > Dan Brown > Foxfire Energy Corp. > Renewable Energy Systems > (802)-483-2564 > www.Foxfire-Energy.com > NABCEP #092907-44 > > > -------- Original Message -------- > Subject: Re: [RE-wrenches] NEC 480 - battery enclosure question > From: Ray Walters <[email protected]> > Date: Wed, December 14, 2011 11:52 am > To: RE-wrenches <[email protected]> > > 110.11 Deteriorating Agents. Unless identified for use in > the operating environment, no conductors or equipment > shall be located in damp or wet locations; where exposed to > gases, fumes, vapors, liquids, or other agents that have a > deteriorating effect on the conductors or equipment; or > where exposed to excessive temperatures. > Informational Note No. 1: See 300.6 for protection against > corrosion. > > 110.18 Arcing Parts. Parts of electrical equipment that in > ordinary operation produce arcs, sparks, flames, or molten > metal shall be enclosed or separated and isolated from all > combustible material. > > 300.6 Has a lot of good info on corrosion that we in the solar biz should be > all over, as well. > > So that's 3 pretty specific code references. > > Ray Walters > > On 12/13/2011 7:03 PM, [email protected] wrote: >> >> On 12/13/2011 5:47 PM, Dan Fink wrote: >>> Esteemed Wrenches; >>> An email question from my recent Home Power article on charge controllers >>> that I'm unsure of. >>> Does NEC specifically forbid mounting other gear, such as charge >>> controllers, inside a battery enclosure? How about shunts? >>> It's not in 480 that I can see, and 480 doesn't seem to treat the interior >>> of a battery enclosure as particularly explosive, because as per 480 it has >>> to be adequately vented anyway. >>> Of course there are a zillion common-sense reasons not to actually DO that >>> -- even an MX60 has a relay that can spark-- and of course corrosion on the >>> controller terminals, circuit board, etc. Bad news all around and I never >>> do it. I learned this as an apprentice back in the 1990s, and I just don't >>> do it. But I do put shunts in there sometimes...is this a no-no? The shunt >>> terminals are brass, I've never seen any really nasty corrosion build up, >>> but I'm quite curious. >>> BUT I'm wondering if I'm missing something obvious in some other NEC >>> section etc. >>> >>> Thanks in advance! >>> >> >> >> Hi Dan. Nice article, BTW ! >> >> >> The NEC doesn't say that you CAN do this, but it does not dis-allow it >> either. >> >> It will come down to what the battery manufacturer says, is what we have >> found. >> >> Sealed batteries are the only ones that can be mounted in a battery box with >> arc and spark equipment. >> >> Look at UPS's that you buy from COSTCO for instance. They are UL listed, >> usually. >> >> boB >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: [email protected] >> >> Options & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> >> >> >> > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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