[RE-wrenches] Battery Fuse Locations

[RE Ellison]

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 <wkorthof at 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.Ratico at 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 ---
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