Q. When a conduit leaves a Class I, Division 1 classified paint spray room and goes under the concrete floor into a cabinet in the motor control room that is non-classified, is one sealing fitting in the paint mix room sufficient, or is an additional sealing fitting required in the non-classified area as well?

A. A single conduit seal in the spray area is okay, as long as it is within 10 feet of the Class I, Division 1 location boundary. There must be no fitting, except a listed explosionproof reducer, between the seal fitting and the point at which the conduit leaves the Class I, Division 1 location [516.4(A) and 501.15(A)(4)].