[RE-wrenches] EGC for Enphases
All, I was just looking at small 4-module Andalay (Enphase 190) system tying into one of the Lennox solar-ready air conditioners. The engineer had specified the 690.47(C) GEC be run directly from the array down to the existing electrode. Running from the inverters is a 2+G wire to the Lennox panel; they are using the uninsulated ground as the circuit neutral. It seems to me that this violates 200.7 (grounded conductor marked white or grey). Also, 250.134(B) (EGC run with circuit conductors), about which the engineer states "I have been studying the NEC on this and I believe that the intent is to permit the ground to be carried with the current carrying conductors, not require." Am I missing something? Thanks, Dave ___ 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
Re: [RE-wrenches] double insulated wire
So now I have to stock coloured PV Wire? On Tue, Jul 2, 2013 at 6:49 PM, jay peltz wrote: > HI Ray, > > I agree and think that at least high voltage DC should have its own color > code. > Labels go away, but wire colors are forever. > > thanks, > > jay > > peltz power > > > On Jul 2, 2013, at 11:15 AM, Ray Walters wrote: > > > Hi Dick; > > > > What you're suggesting is actually something I thought would work too: > having totally odd colors that immediately said DC. > > IT really would be the best, because if you go in with a meter set to > read AC, and show no voltage, then get your voltage sniffer out, and it > doesn't beep, you think you're double safe, when actually you could get hit > with 500 v dc. > > > > I try and mark every J-box that has DC conductors in it with the DC > voltage. The life I save probably will be my own, as I'm getting more > forgetful with age.. > > > > I think one of the problems is that this is actually not a NEW issue; > we are reviving the 100+ year old AC vs DC battle that Edison > Westinghouse, and Tesla, et al. fought before. Factories have AC and DC on > site, and it just amazes me that marking polarity isn't required by code. > We have to mark the bonded conductor, or the high leg in certain 3 phase > systems, so identifying DC polarity seems just as important. > > I actually really like your purple with a white stripe idea. At one > time I tried to color code for DC voltage too, (Red for 12 v, purple for > 24, Orange for 48 v) and even used yellow tape for my PV inputs as they had > a higher V than the battery. Now I just try to label everything copiously, > and have polarity align with my meter. > > My biggest problem is still old 12 v house wiring on Romex (white and > black) or which side of those Monkey face outlets should be + or - .. > These days, I just try to switch the circuit over to AC (go Tesla!) > > > > R.Ray Walters > > CTO, Solarray, Inc > > Nabcep Certified PV Installer, > > Licensed Master Electrician > > Solar Design Engineer > > 303 505-8760 > > ___ > 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 > > -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts ___ 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
Re: [RE-wrenches] double insulated wire
It is my understanding that 2014 NEC will require red-positive, black-negative, white-grounded conductor for all DC wiring. Remarking still allowed for larger than #6. I have also heard that some modules will soon come with one black and one white lead. -- Shine On! Kris Schmid Legacy Solar, LLC 864 Clam Falls Trail Frederic, WI 54837 715-653-4295 www.legacysolar.com NABCEP Certified PV Installer Licenced Wisconsin Master Electrician BSEE On Jul 3, 2013 11:46 AM, "Chris Mason" wrote: > So now I have to stock coloured PV Wire? > > > On Tue, Jul 2, 2013 at 6:49 PM, jay peltz wrote: > >> HI Ray, >> >> I agree and think that at least high voltage DC should have its own color >> code. >> Labels go away, but wire colors are forever. >> >> thanks, >> >> jay >> >> peltz power >> >> >> On Jul 2, 2013, at 11:15 AM, Ray Walters wrote: >> >> > Hi Dick; >> > >> > What you're suggesting is actually something I thought would work too: >> having totally odd colors that immediately said DC. >> > IT really would be the best, because if you go in with a meter set to >> read AC, and show no voltage, then get your voltage sniffer out, and it >> doesn't beep, you think you're double safe, when actually you could get hit >> with 500 v dc. >> > >> > I try and mark every J-box that has DC conductors in it with the DC >> voltage. The life I save probably will be my own, as I'm getting more >> forgetful with age.. >> > >> > I think one of the problems is that this is actually not a NEW issue; >> we are reviving the 100+ year old AC vs DC battle that Edison >> Westinghouse, and Tesla, et al. fought before. Factories have AC and DC on >> site, and it just amazes me that marking polarity isn't required by code. >> We have to mark the bonded conductor, or the high leg in certain 3 phase >> systems, so identifying DC polarity seems just as important. >> > I actually really like your purple with a white stripe idea. At one >> time I tried to color code for DC voltage too, (Red for 12 v, purple for >> 24, Orange for 48 v) and even used yellow tape for my PV inputs as they had >> a higher V than the battery. Now I just try to label everything copiously, >> and have polarity align with my meter. >> > My biggest problem is still old 12 v house wiring on Romex (white and >> black) or which side of those Monkey face outlets should be + or - .. >> These days, I just try to switch the circuit over to AC (go Tesla!) >> > >> > R.Ray Walters >> > CTO, Solarray, Inc >> > Nabcep Certified PV Installer, >> > Licensed Master Electrician >> > Solar Design Engineer >> > 303 505-8760 >> >> ___ >> 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 >> >> > > > -- > Chris Mason > President, Comet Systems Ltd > www.cometenergysystems.com > Cell: 264.235.5670 > Skype: netconcepts > > ___ > 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
