I just wired a 50 kw array using Mcmaster-carr #7429K42 www.Mcmaster.com uv-resistant cable clamps. They worked great, attached to the Unirac rail with SS screws. Certainly much neater than tie-wraps. I was never able to get tie wraps to look that good in any installation. These little clamps, along with the acme SS clamps for the module frames that Wiley and others sell, really made the wiring look good. >From the point of connection to the module mc connectors, I attached my USE-2 wire down the respective rack legs to a j-box, entering through a 2-hole weather-tite connector, then to 1" FMC to the fused combiner box, then EMT to the respective inverter disconnect.
Kirk, VT Solar -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Richard L Ratico Sent: Tuesday, December 16, 2008 9:47 AM To: re-wrenches@lists.re-wrenches.org Subject: Re: [RE-wrenches] SS Zip Ties Tump, Interesting. No AHJ on my job in NH. Just trying to comply with the intent of the code and common sense. Next time, with the same AHJ, you might try using plumber's CVPS DWV pipe, it's not conduit :-) Dick --- You wrote: I tried this once only to have the AHJ indicate that that is NOT the correct method of use for PVC conduit. "You need to have strain relief's on your wires if your using conduit". Needless to say; yes sir, removed it & used tie straps. AHJs...... -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Richard L Ratico Sent: Monday, December 15, 2008 10:55 PM To: re-wrenches@lists.re-wrenches.org Subject: Re: [RE-wrenches] SS Zip Ties Fellow Wrenches, For MC cable "management", we recently used 1 1/4" Schedule 40 PVC conduit, strapped loosely (to allow for expansion/contraction) to the our top rack rail with SS pipe clamps. The conduit was drilled with a 1 1/4" hole saw every 18" or so to match the spacing of the module pigtails. The hole edges were softened with a dremel tool. The MC cables dropped into the conduit through the drilled holes. We also drilled 3/8' holes in the PVC to act as drains. Excess cable was folded and tucked into the conduit. The layout was planned to allow easy access to each module's cables. Grounding was by WEEB washers. This approach was much more satisfying and easier to implement than tywraps or clips. The conduit dropped through the roof deck through an LB in a roof boot directly into a metal junction box. EMT to the DC disco. The LB was dammed with duct seal. Best, Dick Dick Ratico Solarwind Electric Bradford, VT _______________________________________________ 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
