I have also seen the color convention that Ray enumerated becoming the standard. The one variation (which I like) is to use the following for the positively grounded legs of a bi-polar system:
Black = negative; GREY = positive This can help prevent confusion between the two different grounded conductors. - Andrew Sent from my iPhone On Jun 28, 2013, at 12:54 PM, Ray Walters <r...@solarray.com> wrote: > The convention of red for positive and black for negative is not just > automotive. It is also used by all battery based inverter manus, all battery > companies, and all multimeters. > John Wiles also agrees; > red = positive, black = negative for ungrounded systems > red = positive, white = negative for negative grounded systems > white = positive, black = negative for pos grounded systems. > I take it a step further, and use white label tape with red lettering that > says "+ positive ground + ", > because I've seen so many problems with positive grounded systems, and people > not getting polarity correct. > All of this is NEC compliant, and follows standard conventions. > Make it easy on yourself and your journeymen on a hot roof, and have your > color coding match their multimeter. > You might save an inverter or even a life. > R.Ray Walters > CTO, Solarray, Inc > Nabcep Certified PV Installer, > Licensed Master Electrician > Solar Design Engineer > 303 505-8760 > On 6/28/2013 12:09 PM, Allan Sindelar wrote: >> On 6/28/2013 11:47 AM, a...@aramsolar.com wrote: >>> And of course Red for positive and black for negative. >>> Most building departments have not pick up on this yet. But >>> they will. >>> Aram >> >> Where does "of course Red for positive and black for negative" come from, >> please? I only know it as an automotive standard that has often caused >> confusion when used by DIY offgridders in years past, as black thus could >> represent either positive or negative in a DC conductor pair. >> Is there yet a convention for ungrounded arrays? While red and black are >> technically correct as ungrounded current-carrying conductors, use of this >> color convention could cause as much confusion as resolve it in the future. >> How about "black and black" or for that matter "yellow and orange" (if >> supplied by manufacturers) for ungrounded arrays? >> Thanks, Allan >> >> Allan Sindelar >> al...@positiveenergysolar.com >> NABCEP Certified PV Installation Professional >> NABCEP Certified Technical Sales Professional >> New Mexico EE98J Journeyman Electrician >> Founder and Chief Technology Officer >> Positive Energy, Inc., a Certified B CorporationTM >> 3209 Richards Lane >> Santa Fe, New Mexico 87507 >> 505 424-1112 office 780-2738 cell >> www.positiveenergysolar.com >> >> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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