August and Max,
If all you are doing in supporting the conductors, PVC conduit is sufficient with protective bushings on each end. Once you go to EMT, then grounding bushings must be installed at both ends and the EGC needs to pick up those bushings. More expensive and time consuming, but it looks better and you can span a greater distance. Bill. From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Max Balchowsky Sent: Thursday, October 08, 2009 8:29 PM To: RE-wrenches Subject: Re: [RE-wrenches] Rooftop wiring methods between multiple subarrays August - we've been using 1/2" emt between arrays with plastic bushings to protect wires and a dual "minerallac" clamps ( http://minerallac.thomasnet.com/viewitems/pipe-fasteners/ll-categories-cully-pipe-fasteners-conduit-hangers? <http://minerallac.thomasnet.com/viewitems/pipe-fasteners/ll-categories-cully-pipe-fasteners-conduit-hangers?&bc=100%7C1006%7C1281&forward=1> &bc=100|1006|1281&forward=1) to tie the conduits to the riser on the array support. Has worked well over the years and the inspectors like the "bond" between the arrays..... Max Balchowsky SEE Systems 760-403-6810 _____ From: August Goers <aug...@luminalt.com> To: RE-wrenches <re-wrenches@lists.re-wrenches.org> Sent: Thursday, October 8, 2009 11:07:08 AM Subject: [RE-wrenches] Rooftop wiring methods between multiple subarrays Hi Wrenches, I’m looking for fresh ideas on how to run USE-2 wires between subarrays on rooftops. Let’s say we have a flat roof commercial system with dozens of separate rows of modules. How would you folks run the USE-2 wiring between these arrays? We’ve been using J-boxes and EMT which is robust but time consuming. I’ve also used strut with a cap strip on the top which effectively makes a wire raceway but it is difficult to properly ground both ends of the raceway and is also time consuming. Looking forward to hearing your ideas. Best, August August Goers Luminalt Energy Corporation O: 415.564.7652 M: 415.559.1525 F: 650.244.9167
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