I had a discussion the other day with my office, I feel weather tight would meet the code. (existing install is Cls2-div1).
Coal power plant, dock side open conveyer for unloading the barge, Only a shroud over the belt.
My scope: Fire alarm pull stations,120V AC onthe outside railing,notification only to control room. Deluge is manual operation.
The railing is 8' away from the conveyer system,in the wide open air,along the river. All conduit is threaded rigid.
I feel weather tight would be enough.