Safety Glossary

Anchorage – a secure point of attachment for lifelines, lanyards or deceleration devices.

Anchorage Connector – used to join the connecting device (lanyard, lifeline, or deceleration device) to the anchorage.

Arresting Force – the force transmitted to the body when a fall is arrested. Also known as Fall Arrest Force.

Body Belt – a waist strap for attaching to a lanyard, lifeline or deceleration device. Used for positioning and/or restraint. Also known as a Safety Belt.

Body Harness – a design of straps which is secured about a person in a manner to distribute fall arresting forces over at least the thighs, pelvis, waist, chest and shoulders, with provisions for attaching it to other components of a personal fall arrest system. Also known as a Full-Body Harness.

Body Wear – the personal protective equipment worn by a worker, such as a body belt or body harness.

Buckle – an integral connector used to attach straps or webbing segments together or to themselves.

Cam Buckle – an integral connector whereby the shoulder straps can be easily adjusted simultaneously with one hand. Promotes proper snug fit; will not slip or misadjust.

Competent Person – one who is capable of identifying existing and predictable hazards in the surroundings or working conditions which are hazardous, or dangerous to employees, and who has the authority to take prompt corrective measures to eliminate them.

Connecting Device – the critical link which joins the body wear to the anchorage/anchorage connector, such as shock-absorbing lanyard, fall limiter, self-retracting lifeline, rope grab, etc.

Connector – a mechanism or device used to join together components of a personal fall arrest system or parts of a component within the system. See also Hardware.

D-Ring – an integral component or provision commonly found on body wear and some anchorage connectors which allows for attaching a connecting device (lanyard, lifeline, or deceleration device).

Deceleration Device – any mechanism which serves to dissipate energy during a fall arrest, limiting the forces imposed on a person.

Deceleration Distance – the additional vertical distance a falling person travels, excluding lifeline elongation and free fall distance, before stopping, from the point at which the deceleration device begins to operate. It is measured as the distance between the location of a person’s body harness attachment point at the moment of activation (onset of fall arrest forces) of the deceleration device during a fall, and the location of that attachment point after the person comes to a full stop.

DualTech™ Webbing – Two-sided, contrasting color webbing and textures to make donning easier. Engineered with shape-retention memory for a more comfortable fit.

ErgoArmor™ – a semi-flexible back shield that minimizes impact from sharp/heavy snap hooks and self-retracting lifelines.

Fall Indicator – a safety device or warning flag which serves to let a user know that a shock-absorbing lanyard has been involved in a fall and should be removed from service.

Fall Limiter – a self-retracting lifeline/lanyard with a quick-activating braking system that limits a free fall. Refer to Self-Retracting Lifeline/Lanyard. (Ex.: Miller MiniLite® Fall Limiter.)

Free Fall – the act of falling before the personal fall arrest system begins to arrest the fall.

Free Fall Distance – the vertical distance a person falls before the fall arrest system begins to arrest the fall.

Friction Buckle – an integral connector whereby the webbing passes over the knurled bar and back down between the knurled bar and frame to adjust and tighten webbing straps.

Full-Body Harness – (See Body Harness.)

Hardware – buckles, D-rings, snap hooks and associated connectors which are used to attach components of a personal fall arrest system or parts of a component within the system.

Lanyard – a flexible line of rope, wire rope/cable, or webbing which generally has a connector at each end for securing a body belt or body harness to a lifeline, deceleration device or anchorage.

Lanyard Ring – a component of a body harness that allows the user to attach a lanyard when not in use so that it is not hanging freely.

Lifeline – a line provided for direct or indirect attachment to a body belt, body harness, lanyard, or deceleration device. Such lifelines may be horizontal or vertical in application.

Locking Snap Hook – a snap hook that includes a locking mechanism which will keep the hook closed and locked until manually unlocked and opened.

Lower Level – an area or surface to which a person can fall.

Mating Buckle – an integral connector whereby a center bar is pushed through a square link. Webbing is then tightened for proper fit.

Maximum Arrest Force – the peak force on the body during arrest of a fall by the fall arrest system. Also known as Peak Fall Arrest Force.

Orthostatic Intolerance – Refer to Suspension Trauma.

Personal Fall Arrest System
– an arrangement of components that together will arrest a person in a fall from a working level. It typically consists of an anchorage, connecting device and body harness, and may include a lanyard, deceleration device, lifeline or a combination of these.

Personal Fall Limiter (PFL)
– a self-retracting lanyard with a quick-activating braking system that limits a free fall. In addition, a PFL offers versatility through dual operation by either attaching directly to the harness back D-ring for use as a personal fall limiter, or can be used as a traditional retractable lifeline. (Ex.: Miller Scorpion™ Personal Fall Limiter.)

PivotLink™ Connection – The integral point on a Revolution™ Harness that separates the top and bottom allowing for a more comfortable fit when bending and twisting. It is also the connection point for a tool belt, water bottle or tool storage pouches.

Quick-Connect Buckle – for leg and chest harness straps that interlock similar to a seat belt for easy use and features a dual-tab release mechanism to prevent accidental opening.

Retractable Lifeline – See Self-Retracting Lifeline/Lanyard.

Rollout – a process by which a snap hook, carabiner or similar device unintentionally disengages from another component to which it is attached.

Rope Grab – a deceleration device which travels on a lifeline and automatically engages the lifeline and locks to arrest a fall.

Self-Retracting Lifeline/Lanyard – a deceleration device containing a drum-wound line which can be slowly extracted from or retracted onto the drum under slight tension during normal worker movement, and which, after onset of a fall, automatically locks the drum and arrests the fall. Refer to Fall Limiter. (Ex.: Miller MightyLite, Falcon™ and Black Rhino™ Self-Retracting Lifelines.)

Shock Absorber – a component of a personal fall arrest system which allows dissipation of energy by extending deceleration distance reducing fall arrest forces.

Shock-Absorbing Lanyard – specially-designed lanyard that elongates during a fall to significantly reduce fall arresting forces.

Snap Hook – a connector with a hook-shaped member, keeper, latch or other similar arrangement which may be opened to receive an object and, when released, automatically closes to retain the object.

Strap – a length of webbing.

Stretchable Harness – a full-body harness that is more comfortable to wear because the webbing is a blend of nylon, polyester, and a specially-formulated elastomer that stretches. Includes provisions for attaching a lanyard, lifeline or deceleration device.

Sub-Pelvic Strap – a full-body harness strap, which passes under the buttocks without passing through the crotch, that is designed to transmit forces applied during fall arrest or post-fall suspension to the sub-pelvic part of the body.

Suspension Trauma (Orthostatic Intolerance) – when a person falls and remains both vertical and sedentary for a period of time, blood pools in the veins of the legs, which could result in unconsciousness. If a person is not rescued quickly, permanent damage and possibly death may result. (Miller Relief Step Safety Device relieves suspension trauma.)

Tie-Back Lanyard – a flexible line of heavy-duty, abrasion-resistant webbing designed to be used as the connecting device and anchorage connector with a specially-engineered snap hook able to withstand 5,000 lbs. (22kN) (Ex.: Miller BackBiter® Tie-Back Lanyard.)

Tongue Buckle – an integral connector similar to a standard belt buckle whereby a webbing strap is inserted through the buckle placing the buckle tongue through the appropriate grommet hole. Also known as a Grommet Buckle.

Total Fall Clearance Distance – the maximum vertical distance that a worker could potentially fall and still avoid contact with a lower level.

Total Fall Distance – the maximum vertical distance between the full-body harness attachment point and the lowest extremity of the body before and after the fall is arrested including lanyard extension and/or deceleration distance.

Trailing Rope Grab – a rope grab which moves freely up and down the lifeline with hands-free operation.