Re: [RE-wrenches] voltag drop
Round trip... (unless you are using a table that has already counted this in) Take care, Walt From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Marco Sent: Monday, December 08, 2008 2:13 PM To: re-wrenches@lists.re-wrenches.org 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/ image001.jpg___ 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
Re: [RE-wrenches] voltag drop
Depends on what table or calculations you are using. The current has to flow the full distance, out and back, but most tables I have seen have that figured into it. If you are using the resistance from something like AWG wire tables, then you need to use the round trip distance. .. Northern Arizona Wind Sun - Electricity From The Sun Solar Discussion Forum: http://www.wind-sun.com/ForumVB/ .. - Original Message - From: Marco To: re-wrenches@lists.re-wrenches.org Sent: Monday, December 08, 2008 3:12 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 -- ___ 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 image002.jpg___ 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
Re: [RE-wrenches] voltag drop
Marco, I use the following formulas: single-phase Vd = (I x L x R x 2)/1000 3-phaseVd = (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 T [EMAIL PROTECTED] - Original Message - From: Marco 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 -- ___ 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 image002.jpg___ 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
Re: [RE-wrenches] voltag drop
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-phaseVd = (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 image.jpg___ 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
