Galvy in Concrete [RE-wrenches]

[Jerry Caldwell]

I haven't had occasion to run conduit in concrete
myself, but I have sunk 8" schedule 40 galvanized pipe
for top of pole mounts.  

We recently picked up a project that a general
contractor had started and then decided they wanted us
to finish.  They had done all the hard work - conduit
runs, sank steel poles, concrete & rebar etc. and just
wanted us to mount the modules and wire the batteries
and inverter power panel.

They stubbed 1 1/4" rigid metallic conduit up through
the same concrete that the 8" sched 40 poles were in. 
The 1 1/4" conduit had pvc 2 mil tape wrapped around
it.  The 8" schedule 40 did not.  I have observed this
practice, but don't fully understand it either.

Jerry Caldwell


--- William Miller <wrmiller at slonet.org> wrote:
> Friends:
> 
> I've noticed that one tracker manufacturer or
> another recommends a section
> of re-bar through the bottom of a pipe mast. I
> always assumed this was
> intended to keep the mast from loosening in the
> concrete and rotating under
> heavy wind loads.   Is this possible?  If I sleeve
> my masts, or wrap them
> in foam sheets or vinyl, are they more likely to
> rotate?  Should I cap the
> bottom of the pipe so no concrete to steel contact
> is posssible?
> 
> (These are rhetorical questions.  There would have
> to be strong evidence of
> a problem before I would change practices that are
> tried and true, not just
> by myself, but apparently by many others on this
> list.  I feel that
> galvanized steel in concrete is a good practice. 
> I've seen it extensively
> in RE and communications for structural uses.)
> 
> William Miller
> 
> 
>
__________________________________________________________________
> William Miller
> Miller Power and Communications
> PO Box 50, Santa Margarita, CA 93453
> Voice :805-438-5600     Fax: 805-438-4607	
> email: wrmiller at slonet.org
> http://millerpowerandcomm.com
> License No. C-10-773985
>
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