pole mounting and conduit questions [RE-wrenches]

[Steve Johnson]

Hi Nik,

As Walter and Max noted running up the pole is not really an issue as 
this is how street lights, parking lot lights  and traffic lights are 
done.  Typically your run PVC in the concrete and turn up in the middle 
of the pole before the pour.  A hand hole is supplied in the base of the 
pole to reach in and make up connections.  This handhole is reinforced 
and heavily welded to maintain pole strength.  This isn't your question 
I know, because the pour is done.

My concern would be with wind loading on the panels.  What size anchor 
bolts are you using?  What is concrete depth and diameter?  I'm asking 
because the nice thing about anchor bolting is one crew can do the 
polebase and when the solar crew shows up the concrete is cured and 
ready to go.  I used to work for an electrical contractor that did alot 
of this.  They had a polebase crew that augered the hole, built rebar 
cage and set it, set anchor bolt template, made the pour and finished 
the concrete.  This used to run about $500 a few years ago.    
If I'm doing 2 or 3 poles or more it might be handy to sub this out to 
an experienced "polebase crew". I think you would want big anchor bolts 
though.  Maybe 3ft by 1"?  30" x 7/8"?  I think 3,000 psi concrete is 
standard.


Nicholas Ponzio wrote:
> 
> Does anyone have experience running conduit up through a pole? How do
> you enter the pipe at the bottom? And do you run conduit all the way
> up the pole or does the pole itself become your conduit?
> 
> We're using anchor bolts with a pre-welded plate on the bottom of the
> steel pipe. See photo here:
> http://www.flickr.com/photos/14918878@N04/2214585386/
> 
> What I'd like to do is run conduit up the inside of the pole and exit
> through the "gimble" on the poletop. See an example of a light post
> here: http://www.flickr.com/photos/14918878@N04/2214578212/
> I haven't seen this done with PV but I'm sure it's possible. The DP&W
> racks come with a knockout on the gimble, for this purpose. Not sure
> about Zomeworks, though.
> 
> Any feedback is appreciated.
> 
> Thanks,
> -Nik



Steve Johnson
LightWave Solar Electric
Nashville, Tennessee


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