Re: [RE-wrenches] Shoes
The Amish builders in our area swear by "Faded Glory"from Walmart. Cheap in price and best for traction, especially on steel roofs. Mark Original Message Subject: [RE-wrenches] ShoesFrom: "Mark Frye" [EMAIL PROTECTED]Date: Thu, November 20, 2008 4:29 pmTo: "'RE-wrenches'" re-wrenches@lists.re-wrenches.org Any thoughts on the best type of shoe for working on comp shingle roof? Good traction, least wear and tear on shingles? Has anyone tried a felt soled fishing boot? Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 www.berkeleysolar.com ___List sponsored by Home Power magazineList Address: RE-wrenches@lists.re-wrenches.orgOptions settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.orgList-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.orgList rules etiquette:www.re-wrenches.org/etiquette.htmCheck 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
Re: [RE-wrenches] box fill calcs
I brought this subject up in class. Chuck says he doesn't think there's anything in the code about it. the closest thing I could come up with was clamps -- so you'd relate it to the largest conductor in the box. But I'm a baby too. i like over sized boxes. db Dan Brown President Foxfire Energy Corp. Renewable Energy Systems (802)-483-2564 www.Foxfire-Energy.com NABCEP #092907-44 ** One site has it all. Your email accounts, your social networks, and the things you love. Try the new AOL.com today!(http://pr.atwola.com/promoclk/10075x1212962939x1200825291/aol?redir=http://www.aol. com/?optin=new-dp%26icid=aolcom40vanity%26ncid=emlcntaolcom0001) ___ 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] box fill calcs
At 05:40 AM 11/21/2008, you wrote: I brought this subject up in class. Chuck says he doesn't think there's anything in the code about it. the closest thing I could come up with was clamps -- so you'd relate it to the largest conductor in the box. But I'm a baby too. i like over sized boxes. db The Code doesn't cover every possible aspect. The size of the splicing devices does not seem to be covered. You could have a minimum sized junction box, and connect the wires with big blue wire nuts and have trouble getting it all in. I'm also a believer in oversized boxes. The code minimum size box is the smallest box that everything can be stuffed into. Labor saved will usually be more than money spent on a bit more comfortable fit. Drake Chamberlin Athens Electric OH License 44810 CO License 3773 740-448-7328 740-856-9648 ___ 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] box fill calcs
I believe you would just determine the size of the J-Box based on the largest sized conduit entering and leaving the box. Code: 314.28 A 12 Carl Hansen___ 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] DC Rating of Disconnects
Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] _ From: Peter Parrish [mailto:[EMAIL PROTECTED] Sent: Friday, November 21, 2008 9:10 AM To: 'RE-wrenches' Cc: 'Peter Parrish' Subject: DC Rating of Disconnects I am looking into using the PV Powered PVP2000 inverter for some small, low voltage designs. The string Voc will be around 200 Vdc, worst case. Since the PVP2000 doesn't come with a DC disconnect, I am wondered what other wrenches who install the PVP2000 have been doing about this. I hate to spend $150 on a 600 V AC/DC disco such as the SD HU361RB to provide the means of disconnection. I believe that the 240 V AC discos such as the SD DU221RB have no DC rating. From an academic point of view, I wonder why the smaller discos are not dual rated, since we all know that the real-time voltage difference in a 240 V AC system can be 41% greater than 240 V. In any event, any Code-compliant solutions would be greatly appreciated. - Peter Peter T. Parrish, President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] ___ 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] DC Rating of Disconnects
Peter, Many general duty safety switches, such as the Siemens GNF321R, are rated for 250 volts dc. They usually require the use of two switch poles. Kent Osterberg Blue Mountain Solar Peter Parrish wrote: Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] *From:* Peter Parrish [mailto:[EMAIL PROTECTED] *Sent:* Friday, November 21, 2008 9:10 AM *To:* 'RE-wrenches' *Cc:* 'Peter Parrish' *Subject:* DC Rating of Disconnects I am looking into using the PV Powered PVP2000 inverter for some small, low voltage designs. The string Voc will be around 200 Vdc, worst case. Since the PVP2000 doesn’t come with a DC disconnect, I am wondered what other wrenches who install the PVP2000 have been doing about this. I hate to spend $150 on a 600 V AC/DC disco such as the SD HU361RB to provide the means of disconnection. I believe that the 240 V AC discos such as the SD DU221RB have no DC rating. From an academic point of view, I wonder why the smaller discos are not dual rated, since we all know that the real-time voltage difference in a 240 V AC system can be 41% greater than 240 V. In any event, any Code-compliant solutions would be greatly appreciated. - Peter Peter T. Parrish, President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] ___ 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] DC Rating of Disconnects
Peter: An arc is created in the process of disconnecting any current under load. DC circuits have an enhanced ability to sustain that arc. PV circuits exacerbate this problem as a short or load is disconnected because they can sustain a short but the voltage rises drastically as a circuit is disconnected. This all justifies the added expense of a DC rated disconnect. We use the Square D HU361 without hesitation. There are few alternatives available and none with any significant cost savings. In selecting a disconnect, a design-build contractor must use the highest Voc possible. Make sure you are entering the If we used a disconnect without the correct rating we would open ourselves to unacceptable liability exposure and, worse yet, would not experience that pleasant feeling one gets when you know you've done the job right. William Miller At 09:11 AM 11/21/2008, you wrote: Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] -- From: Peter Parrish [mailto:[EMAIL PROTECTED] Sent: Friday, November 21, 2008 9:10 AM To: 'RE-wrenches' Cc: 'Peter Parrish' Subject: DC Rating of Disconnects I am looking into using the PV Powered PVP2000 inverter for some small, low voltage designs. The string Voc will be around 200 Vdc, worst case. Since the PVP2000 doesn't come with a DC disconnect, I am wondered what other wrenches who install the PVP2000 have been doing about this. I hate to spend $150 on a 600 V AC/DC disco such as the SD HU361RB to provide the means of disconnection. I believe that the 240 V AC discos such as the SD DU221RB have no DC rating. From an academic point of view, I wonder why the smaller discos are not dual rated, since we all know that the real-time voltage difference in a 240 V AC system can be 41% greater than 240 V. In any event, any Code-compliant solutions would be greatly appreciated. - Peter Peter T. Parrish, President ___ 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] DC Rating of Disconnects
Peter: I am resending, the first version inexplicably deleted some text: An arc is created in the process of disconnecting any current under load. DC circuits have an enhanced ability to sustain that arc. PV circuits exacerbate this problem as a short or load is disconnected because they can sustain a short but the voltage rises drastically as a circuit is disconnected. This all justifies the added expense of a DC rated disconnect. We use the Square D HU361 without hesitation. There are few alternatives available and none with any significant cost savings. In selecting a disconnect, a design-build contractor must use the highest Voc possible. Make sure you are entering the 690.7 table with the record low temperature for the location. If we used a disconnect without the correct rating we would open ourselves to unacceptable liability exposure and, worse yet, would not experience that pleasant feeling one gets when you know you've done the job right. William Miller At 09:11 AM 11/21/2008, you wrote: Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] -- From: Peter Parrish [mailto:[EMAIL PROTECTED] Sent: Friday, November 21, 2008 9:10 AM To: 'RE-wrenches' Cc: 'Peter Parrish' Subject: DC Rating of Disconnects I am looking into using the PV Powered PVP2000 inverter for some small, low voltage designs. The string Voc will be around 200 Vdc, worst case. Since the PVP2000 doesn't come with a DC disconnect, I am wondered what other wrenches who install the PVP2000 have been doing about this. I hate to spend $150 on a 600 V AC/DC disco such as the SD HU361RB to provide the means of disconnection. I believe that the 240 V AC discos such as the SD DU221RB have no DC rating. From an academic point of view, I wonder why the smaller discos are not dual rated, since we all know that the real-time voltage difference in a 240 V AC system can be 41% greater than 240 V. In any event, any Code-compliant solutions would be greatly appreciated. - Peter Peter T. Parrish, President ___ 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-wrenches] NEC compliant solar labels
Tyco makes solar labels. See www.tycoelectronics.com/AboutUs/news/getpdf.asp?id=1363f=solar_labels_flyer_final.pdf At least one reseller offers the labels. See http://store.altenergystore.com/Enclosures-Electrical-and-Safety/NEC-Compliant-Safety-Labels/NEC-Compliant-Grid-Tie-Safety-Labels/p6618/___ 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] NEC compliant solar labels
Ahhh yes... I love this NEC signage requirement. It goes a long way toward re-assuring inspectors and others that the inverter does a reliable job disconnecting if the grid goes down. I will put this at the top of my 690 improvement list. Along the same lines: we oughta sell lightbulb base stoppers to keep all those electrons from leaking out of lamps without bulbs! ;-) Have great weekends all my fellow wrenches! Its a cold but clear day here and I'm gonna go home and cut firewood and play guitar hero with my kids. For a brighter energy future, Geoff Greenfield Founder and CEO Third Sun Solar Wind Power Ltd. 340 West State Street, Unit 25 Athens, OH 45701 740.597.3111 Fax 740.597.1548 www.Third-Sun.com Clean Energy - Expertly Installed - Joel Davidson [EMAIL PROTECTED] wrote: Tyco makes solar labels. See www. tyco electronics.com/AboutUs/news/getpdf.asp?id=1363f= solar _ labels _flyer_final.pdf At least one reseller offers the labels. See http://store.altenergystore.com/Enclosures-Electrical-and-Safety/NEC-Compliant-Safety-Labels/NEC-Compliant-Grid-Tie-Safety-Labels/p6618/ ___ 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
Re: [RE-wrenches] NEC compliant solar labels
Hi Joel, I believe AEE sells them as well, jay peltz power On Nov 21, 2008, at 12:42 PM, Joel Davidson wrote: Tyco makes solar labels. See www.tycoelectronics.com/AboutUs/news/getpdf.asp?id=1363f=solar_labels_flyer_final.pdf At least one reseller offers the labels. See http://store.altenergystore.com/Enclosures-Electrical-and-Safety/NEC-Compliant-Safety-Labels/NEC-Compliant-Grid-Tie-Safety-Labels/p6618/ ___ 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
