This seems more convenient than remembering the constants for copper and aluminum. Please note that I did not give the complete units for those in my previous email. The units for ³k² in those formulas is ohms/mil foot.
On 12/8/08 6:48 PM, "Michael Gullo" <[EMAIL PROTECTED]> wrote: > Marco, > > I use the following formulas: > > single-phase Vd = (I x L x R x 2)/1000 > > 3-phase Vd = (1.73 x I x L x R)/1000 > > L = one-way length > R = resistance of conductor from Table 8 (usually from uncoated copper ohm/kFT > column) > > > Mike > Michael Gullo > Solar Solutions LLC > Marlton, NJ > NABCEP Certified PV Installer > [EMAIL PROTECTED] > >> >> ----- Original Message ----- >> >> From: Marco <mailto:[EMAIL PROTECTED]> >> >> To: re-wrenches@lists.re-wrenches.org >> >> Sent: Monday, December 08, 2008 5:12 PM >> >> Subject: [RE-wrenches] voltag drop >> >> >> >> I feel kinda foolish in asking this.....but when calculating voltage drop in >> a conductor over distance, do I use the one-way or round-trip distance? >> >> >> >> thanks, >> >> marco >> >> >> >> >> >> >> >> Marco Mangelsdorf, Ph.D., President >> Electrical Contractor License C-26351 >> 69 Railroad Avenue, Suite A-7 >> Hilo, Hawaii 96720 USA >> (808) 969-3281, fax 934-7462 >> >> >> www.provisiontechnologies.com <http://www.provisiontechnologies.com> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Options & 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 >> >> Options & 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 >> >> >> David Brearley, Technical Editor >> SolarPro magazine >> NABCEP Certified PV Installer >> [EMAIL PROTECTED] >> Direct: 541.261.6545 >> Fax: 541.512.0343 >> >> Visit our Web site at solarprofessional.com
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