Do not put a circuit breaker in a battery box if you have ever seen one in anger in a dark room they can toss a good set a flaming sparks out that arch chute !
Not good in a battery box! A class T fuse bolted on to a terminal is safe, from my understanding they don't throw a spark when they burn makes no matter where you put the fuse, positive negative or in the middle of each string Just my thoughts, Bob Ellison Bob Ellison > On Aug 10, 2014, at 4:25 PM, William Korthof <wkort...@gmail.com> wrote: > > Also, I think working clearance requirements are relaxed. > > Very sensible. Battery packs present a potential for serious problems in the > event of an uninterrupted fault. > > IMHO, in the US, we already have far too many complicated code rules on PV > systems. But for battery systems, this exception is wise... and I think we > should a step further and provide a mid-point protective fuse in the middle > of each battery string. > > /wk > > > On Aug 10, 2014, at 11:03 AM, richard.l.rat...@valley.net (Richard L Ratico) > wrote: > > Drake, > It seems the code is providing some flexibility for the location of OCPD in > battery circuits. Placement "as close as practicable to the storage battery > terminals" is ok even if that is in an enclosed space (say a battery box) > where > the possible accumulation of flammable gases may occur. > > Dick Ratico > Solarwind Electric > > > > --- You wrote: > Hello Wrenches, > > I'm studying the NEC for a rectification exam, and came across this > little gem. Can anyone explain what the following code rule is saying > from 240.21 H, (Overcurrent Protection, Location in the circuit)? > > (H) Battery Conductors. Overcurrent protection shall be > permitted to be installed as close as practicable to the storage > battery terminals in an unclassified location. Installation of the > overcurrent protection within a hazardous (classified) location > shall also be permitted. > > It seems to say we can't do something, but we can anyway. The > Handbook provides no clarification. > > Thanks, > > Drake > --- end of quote --- > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
