[RE-wrenches] Tigo TS4-A-F

[david quattro]

Zeke,   I agree - especially if we revisit the original intent behind RSD:
keep firefighters safe from contacting live electric parts. Firefighters
have no reason to directly touch a burning ground mounted solar array, nor
even approach it.
   I think I have voiced already my contempt for RSD in general. I can hear
the logic "For firefighter safety, we cannot have 600V+ on a rooftop." That
is a fair position to take. Unfortunately reality reveals that the RSD
units being manufactured are *not* built to safety standards that the world
needs. RSD devices are dangerous now, they are buggy, have a high rate of
failure, and they are causing far more problems than they solve. In my
opinion the RSD requirement should be suspended until manufacturers are
held to higher quality and reliability standards.

On Wed, Nov 19, 2025 at 4:10 PM Zeke Yewdall via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> With regards to ground mount conductors entering a building to the
> inverter and batteries inside.  It doesn't make any sense to require RSD,
> because RSD is about array safety and we've agreed that for a ground mount
> the RSD requirement does not apply.  A disconnect switch has always been an
> acceptable means of shutting down conductors -- whether from a PV array,
> the grid, a generator, or other power source.  So why would a disconnect
> not suffice in this case, rather than putting RSD on the array.   Not
> saying that's what the code says... but logically, the intent of RSD for
> conductor safety could be met with a disconnect switch where they enter the
> building, it seems.
>
>
>
> --
> Zeke Yewdall
> PV Engineer
> NABCEP #031508-89
> zeke at darkforestsolar.com
> 303-523-3592
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