Conduit

Rigid Conduit, Fittings, and Accessories – Frequently Asked Questions
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If it is an external crush than we would refer to the UL Product Standard, UL651
Section 11, Resistance to Crush. These load requirements vary from 750 Pounds
Foot to 1000 lbf for different sizes of Schedule 40 product and is 2000 lbf for all
sizes of Schedule 80 product.
Basically you load the conduit with this weight and the product cannot deform
more than 70%. This test procedure is similar to ASTM D2412.
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