How high conduit off roof? [RE-wrenches]

[Joel Davidson]

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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.

Jeff Wolfe



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