[RE-wrenches] Current limiting fuse at battery bank

[Jerry Shafer]

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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