[RE-wrenches] Current limiting fuse at battery bank

[Mbalchowsky]

It's ALWAYS good practice to install a current limiting fuse at the battery bank, if fact it's very poor practice not to. We're working with a lot of larger lithium ion phosphate manganese systems and I would not install them without it. As far as working on someone else's install, make your  contract very clear as to what the customer can expect as far as your liability when working on an existing system. The more detail, the better.....

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> On Oct 22, 2015, at 7:25 PM, Jerry Shafer <jerrysgarage01 at gmail.com> wrote:
> 
> I agree, fuse it
> 
> Jerry
> 
>> On Oct 22, 2015 3:26 PM, "Tom Ruscitti" <truscitti at taitem.com> wrote:
>> On battery based systems I always install a Class T fuse as close to the battery bank as possible. 690.71(C) is a little vague in requiring a current limiting fuse only where the available short-circuit current from the battery bank exceeds the interrupting ratings of the inverter breaker. Inverter breakers vary in their interrupting ratings and battery banks are big current sources when things go wrong, so it's just a sensible best practice. My question is about service work on systems we didn't install. We're quoting the second job this year for battery replacement where there is no current limiting fuse installed. It's always a tough question to judge what extra work might be required when you touch another contractor's system, but does anyone have an opinion about recommending or requiring the installation of a fuse at the battery box as part of the battery replacement?
>> 
>> Thanks,
>> 
>> - Tom
>> 
>> -- 
>> Tom Ruscitti
>> Senior Engineer
>> 
>> Taitem Engineering, PC
>> 110 S. Albany Street, Ithaca, NY 14850
>> Mobile: (607) 220-7022
>> www.taitem.com
>> 
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