My understanding is it depends on what your doing... these excerpts from NCCCO FQA:
OSHA 1926.1400 covers cranes in construction only. For crane work in general industry, refer to OSHA 1910.180. There are no federal operator certification requirements at this moment in general industry [§ 1926.1400(a)]. updated 01/26/11
If crane work does not fall under one of the special standards, such as Construction or Maritime, then OSHA usually considers it to fall under general industry (29 CFR 1910.180). OSHA generally considers construction to include the building, altering, or repairing of new or existing structures. Construction work also includes demolition and deconstruction of a portion or all of a structure. Maintenance may also be considered construction depending on its complexity and scope. Since similar work can fall into either category depending on the exact nature of the job, the general approach often adopted is: Go with the stricter standard. [See pp. 23-24 for OSHA's further interpretation of "construction" vs. "maintenance."] updated 1/26/11