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, [email protected] (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: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/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: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
