James, Wrenches Traditionally we oy use black + and white - for a grounded PC system enen with RSD, Systems that are not grounded are red + and black - which can be confusing. White is associated with neutral and connected to earth, black hot and red hot and we always use either USE-ll or PV wire, in metallic conduit then stranded THWN-II wire of the same color.
On Fri, Jun 12, 2020, 2:02 PM James Jarvis <[email protected]> wrote: > Hello Wrenches, > > I have an off-grid install where I was recently red-tagged by the state > inspector. System is 24 volt with battery, Magnum inverters, some Magnum > charge controllers, and a Morningstar charge controller. It is permitted > under NEC 2017. > > One of the inspectors issues was that my DC- conductors to the array / > rapid shut down box are black color. He wants them to be white because he > says they are solidly grounded. I reason that they are only solidly > grounded when they are solidly grounded. As soon as the ground fault > protection breaker opens, they are floating at array voltage. I think it is > misleading and unsafe to have a white conductor that can have hundreds of > volts of potential on it when a breaker trips. > > I haven't dug into the code yet. I'm just working on the logic that one of > my mentors put into me which is white wires better not have voltage > potential on them. "That's the sort of sh*t that kills electricians" is > what he repeatedly said ... and it's stuck with me. > > Thoughts? I'm backed into the corner with the state, so I will be changing > them to white even if it is unsafe ... unless I have some code backing. > > <rant>Changing the wires to white will get interesting up on the roof. I > wonder if they want me to cut off the black MC on the modules and replace > them with white? This is mostly just an exercise in the State of Minnesota > only wanting to know about and allow micro inverters. They brought in a > state inspector from three hours away who kept repeating that he was a > "highly qualified individual", but was unable to identify or recognize a > charge controller. He kept referring to the charge controllers as > inverters.</rant off> > > Thanks, > > -James Jarvis > APRS World, LLC > +1-507-454-2727 > http://www.aprsworld.com/ > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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