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Friday, October 29, 2021

Question:

Thanks for the great Code resource. We do a lot of work in hazardous locations. My question is can a threadless (set-screw or compression) fitting be installed on intermediate metal conduit in a Class I, Division 1 location? I don’t believe this meets Code but some in our office say it does.

Thanks for any insight here.

Paul Miller

A

Answer:

Hi Paul,

Thanks for participating. In our opinion, your thinking is correct. Threadless fittings are generally not listed and identified for Class I, Division 1 locations. Section 501.10(A)(3) requires all boxes and fittings be approved for Class I, Division 1. Threadless fittings shall be permitted in Class I, Division 2 locations. It's important to visit the definition of the term "approved" which means acceptable to the authority having jurisdiction (AHJ). The AHJ generally bases approvals on the use of listed or identified equipment, such as fittings for Class I, Division 1 locations. See also Section 500.8(A) and (B).

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