Conduit

Rigid Conduit, Fittings, and Accessories – Frequently Asked Questions
25701 Science Park Drive
Cleveland, Ohio 44122
216-464-3400
1-800-3CARLON (322-7566)
www.carlon.com
and Sch. 80 conduit and fall under the UL category of conduit, not fittings) since
the fittings have been UL approved to be used with both Schedule 40 and
Schedule 80.
Schedule 40 PVC has not necessarily been severely limited as Schedule 80 is
only required in areas subject to physical damage, which is usually a limited
height coming out of the ground along the exterior wall of a building (Articles
300.5 (4) and 352.12(C)), for example, or in a parking garage or up along a pole.
Subject to physical damage areas are where a car or lawnmower or something
will impact the conduit. The uses not permitted for RNC for areas subject to
physical damage unless identified for such use has been around for quite awhile
and Schedule 80 has always been permitted for areas subject to physical
damage. This is nothing new.
PVC conduit and fittings have been listed since the 1960's. Schedule 80 has a
thicker wall than Schedule 40. They both have the same OD but different ID's
and thus a different wirefill. The fittings are either over or under the conduit
anyways, so even if they are impacted, the conduit is still there to provide the
impact protection.
Remember, most damage occurs by not using expansion fittings, because the
force of contraction/expansion can be great enough to pull apart joints.
I am not able to find the coefficient of friction for Sch 40 PVC. Did I miss it in the
web site?
I always recommend 0.1
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