Fall Prevention & Fall Arrest Systems

Fall injury prevention

A Fall Injury Prevention System is designed to prevent a person from falling at height on a work site. This includes edge protection, fall restraint and fall arrest systems.

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In Western Australia, there is a requirement within the OS&H Regulations 1996 to address the risk of a fall 2m or above. This refers to a scaffold, fixed stairs, formwork, landing or a suspended slab.

The regulations also state, if the risk of a fall at a workplace is 3m or above then it is a requirement to provide a Fall Injury Protection System.


Frequently Asked Questions

What Type of Fall Arrest System do I Require?

If your roof area is above 15 degrees in pitch then you require a fall arrest system, if your roof pitch is below 15 degrees then you require a Fall Restraint system.

We recommend for roofs with pitches over 20 degrees that static lines be used as a primary anchor source. This enables the user to have tension on the lifeline while moving across the roof and not having to spool out the lifeline to get to the next anchor. This will also limit any potential free fall (see Limited Freefall in definitions on our webpage).

What is a Fall Prevention System?

Fall Prevention Systems are required when there is a risk of a limited free fall or a free fall from a height of 3m or above, and or if the surface is over 15 degrees.

What is a Limited Free Fall?

Limited Free Fall is a fall up to 600mm.

For example, if a person is climbing a vertical line ladder using a harness and traveller they are using a 12Kn Limited Free Fall system.

What is a Free Fall?

Free Fall is described as a fall over 600mm.

What is a Fall Arrest System?

Fall Arrest Systems use a safety harness attached to a secure anchor point complying with AS/NZS 1891. The anchor or line will be capable of withstanding a minimum 12 Kn force for a limited free fall and 15 Kn force for free fall.

What is a lifeline or lanyard?

The lifeline or lanyard is the connection between your harness and the point of anchor. It is required to have a compliant energy-absorbing device that is attached between the line and the harness. In the event of a person falling the energy absorbing lanyard absorbs the initial force and then anchor restrains the person’s fall.

What is a fall restraint system?

Fall Restraint Systems limit a person’s horizontal movement to restrict them from reaching a position where limited free fall is possible. This is achieved by the user wearing a safety harness that is connected to a fixed-length lanyard attached to an anchor point, or a horizontal lifeline or rail system. The surface must be under 15 degrees, otherwise, you are in fall arrest.

What is a Fall Zone?

A Fall Zone is an area where a free fall could be possible. The fall zone can be within 2m of an edge of a structure or on a slope over 15 degrees.

Types of Safety Roof Anchor Points

Single Anchor Point, or a series of single anchor points. Allows a person wearing a safety harness to attach their lifeline or lanyard too so that they can safely move into and work in the fall zone. The person is essentially attached to a single anchor point at any one time.

Static Lines are fixed horizontal cable, where a person wearing a safety harness, can attach to, via an energy-absorbing lifeline or lanyard and traverse up and down the line.

A Rail System is an overhead rail that a person wearing a safety harness can attach to via an energy-absorbing lanyard or inertia reel. In the event of a fall, this system will activate and arrest a 600mm limited free fall.


All Roof Access WA installs comply with:

  • AS/NZ 1891-1, 2, 3 & 4 - Fall Arrest Systems
  • AS 1657-2018- Fixed Platforms, Walkways, Stairways and Ladders
  • AS/NZS 4488 Parts 1 & 2: Industrial Rope Access Systems
  • AS/NZS 1319 Safety Signs for Occupational Environment
  • Worksafe - Code of Practice - Managing the risk of falls at workplaces