DSA IR 11B-10: SCOPING AND PATH OF TRAVEL UPGRADE REQUIREMENTS FOR FACILITY ALTERATION, ADDITION AND STRUCTURAL REPAIR PROJECTS (with revisions issued through April 2017)

11B-203.5 Machinery spaces. Spaces frequented only by service personnel for maintenance, repair or occasional monitoring of equipment shall not be required to comply with these requirements or to be on an accessible route. Machinery spaces include, but are not limited to, elevator pits or elevator penthouses; mechanical, electrical or communications equipment rooms; piping or equipment catwalks; water or sewage treatment pump rooms and stations; electric substations and transformer vaults; and highway and tunnel utility facilities.