Question

Type PVC conduit, Type RTRC conduit, and Type HDPE conduit shall be permitted in Class I, Division 1 underground locations where encased in a concrete envelope a minimum of _____ in. thick and provided with not less than _____ in. of cover measured from the top of the conduit to grade.

Answer 1

The minimum requirements for concrete envelope and conduit cover in underground wiring are;

- concrete envelope = minimum of 2 inches thick

- conduit cover = minimum of 24 inches thick

Requirements for Electrical Wiring

According to the 2011 NEC(National Electrical Code) requirements as pertaining to underground wiring, we are told that;

• The conduit(s) covers must be encased in a concrete envelope with a thickness of at least 2 inches.

• Secondly, the 2011 National Electrical Code) requirements also states that the cover must be at least 24 inches of cover from the top of the conduit to the grade surface.

• Finally, another key thing we see is that in a case of wire entry or exit from the ground, the method of wiring must change to another type with examples like RMC or IMC.

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