Yes that is true, there is a threshold for what is considered "low
voltage" an when this went into NEC they were thinking about door
bell, telephones and alarm system and heat thermostats.

But you can use high voltage as long as you follow the code.   When
solar panels are installed they almost always use conduit for the DC
wire.


> Yes, quite a bit, for starters it must be class 2 compliant. And they
> draw a line at 30 volts. With separate 12 and 24 volt categories.
>
> This is probably the best starter reading:
>
> <https://www.elementalled.com/low-voltage-safety-understanding-class-2-compliance/>
>
> The language used is much closer to easily understood than the typical
> NEC edicts.
>
> --
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
>
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-- 

Chris Albertson
Redondo Beach, California

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