Definitions

Aerial device. Any vehicle-mounted or self-propelled device, telescoping extensible or articulating, or both, which is primarily designed to position personnel

Articulating boom. An aerial device with two or more hinged boom sections

Boom. An elevating member; the lower end of which is so attached to a rotating or non-rotating base that permits elevation of the free or outer end in vertical plane

Cherry picker. A colloquial term for any of a class of non-telescoping aerial boom lifts typically used to service telephone, cable television, or electrical equipment on utility poles, and tree trimming operations. Cherry pickers usually have solid-walled, single-man baskets.

Custodian. A person who is responsible for a MEWP (whether SLAC-owned, rented, or leased)

Danger zone. Any place in or about a machine or piece of equipment where a person may be struck by or caught between moving parts, caught between moving and stationary objects or parts of the machine, caught between the material and a moving part of the machine, burned by hot surfaces, or exposed to electric shock

Elevating work platform. A device designed to elevate a platform in a substantially vertical axis (vertical tower, scissor lift)

Extensible boom platform. An aerial device (except ladders) with an extensible boom. Telescopic booms with personnel platform attachments shall be considered to be extensible boom platforms.

Genie. Common brand name of aerial device

JLG. Common brand name of aerial device

Insulated aerial device. An aerial device designed for work on or near energized lines and apparatus

Mobile elevating work platform (MEWP). A general term used for scissor lift, aerial platform, or an extensible or articulating boom aerial device (either self-propelled or vehicle-mounted) used for the purpose of positioning personnel, their tools, and necessary materials to elevated work locations. Not included in this definition are ladder stands, scaffolds, or industrial trucks.

Operator. A trained and authorized person who controls the movement of the MEWP

Override. The taking over of primary control functions from a secondary location

Platform. Any personnel-carrying device, such as a bucket, basket, cage, stand, or tub, that is a component of a MEWP

Pre-use inspection. A thorough equipment and area inspection conducted before each shift, prior to putting a MEWP into service

Proficiency instructor. A person with advanced training in safe MEWP operation designated by line management to conduct operator proficiency (hands-on) training for MEWP operators (see Forms & Tools, MEWP: Proficiency Instructor Requirements [pdf], for an example)

Spotter. A person designated to monitor conditions for any health or safety impacts

Stability. A condition of a work platform in which the sum of the moments tending to overturn the unit is less than the sum of the moments tending to resist overturning