How high conduit off roof? [RE-wrenches]

[Bob-O Schultze, Electron Connection]

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Gang,
I've looked through the 2005 NEC and can find no stipulations about EMT 
or any other conduit needing to be installed any distance from the 
roof. Certainly there are guides for the distances between supports, 
etc. Of course, the reason that AHJs have leeway to interpret the Code 
is that different regions have different climate conditions which may 
lend themselves to different best practices. Fair enough. I've never 
heard of anyone interpreting the Code to call a roof a place where 
conduit is exposed to "severe physical abuse". That seems pretty over 
the top and worth a challenge.
Cheers, Bob-O
On Aug 29, 2005, at 11:10 AM, Joel Davidson wrote:

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> Jeff,
> You're right about EMT not permitted where it will be subject to severe
> physical abuse. NEC says securing supports within 3 feet of tubing
> terminations, but I also put a block right at the couplings because 
> that's
> what comes apart when people trip over or step on the conduit.
> Joel Davidson
>
> Original Message:
> -----------------
> From: Jeffery Wolfe, Global Resource Options 
> jeff at globalresourceoptions.com
> Date: Thu, 25 Aug 2005 23:09:36 -0400
> To: RE-wrenches at topica.com
> Subject: RE: How high conduit off roof? [RE-wrenches]
>
> Joel,
>
> Code does stipulate (I do not have it in front of me, but I have seen
> the reference) that EMT cannot be installed in areas "subject to
> mechanical abuse". I have had inspectors claim that all conduit on the
> roof falls under this, as it gets wind, snow and ice (around here),
> trees falling on it, people tripping over it, etc.
>
> We check with the local before doing roof conduit. It varies
> tremendously, from union shops doing PVC to hacks doing IMC, depending
> upon local custom. We do like to make it sturdy though, as it is 
> subject
> to a fair amount of abuse over a 25 year life. We typically fasten it
> down by attaching wooden (PT) spacers to concrete blocks. Concrete 
> block
> holds it in place, off the roof (cooler and better for drainage), but
> does not penetrate the roof.

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