Why project teams need to think beyond the handrail when planning temporary edge protection
When a project team asks whether an edge-protection product is compliant, it sounds like the right question.
It isn’t quite.
A post can be tested. A rail can meet a specification. A component can arrive on site with the right paperwork.
But none of that tells you whether the installed edge-protection system will work properly on your particular structure, in your particular configuration, under the conditions in which it will actually be used.
That distinction matters.
At NON-DRILL, we think edge protection is too often treated as equipment that gets selected towards the end of the process. The structure is already designed. The precast elements have been manufactured. The concrete is poured. Access is required. Then somebody asks where the handrail posts are going.
By that stage, one of the most important decisions has already become harder than it needed to be:
How is the edge protection going to connect to the structure?
That is why we use a simple principle:
Compliance is a system, not a sticker.
The handrail matters. So does everything around it.
The Standard is part of the answer, not the whole answer. For temporary edge-protection equipment within its scope, the AS/NZS 4994 series provides the principal Australian and New Zealand standards framework.
AS/NZS 4994.1:2023 deals with the general requirements for temporary edge-protection equipment. Other parts of the series address installation and dismantling in different applications.
AS 1657:2018 has a different purpose. It deals with fixed platforms, walkways, stairways and ladders used to provide safe access for activities such as operation, inspection, maintenance and servicing.
That distinction is important because it is tempting to simplify the standards into “4994 is temporary, 1657 is permanent”. Real projects are rarely quite that tidy.
What is being designed? Why is the protection required? Who will use it? How long will it remain? What structure will it connect to? What other project specifications, WHS requirements or authority requirements apply?
Those questions matter just as much as the number printed on the Standard. Australian Standards can form an important part of the compliance framework, but the project still needs to understand the legislation, specifications, contractual obligations, engineering requirements and approval processes relevant to the work.
In other words, knowing which Standard applies is the beginning of the conversation. It is not the end of it.
Start with the risk, not the product
Before deciding which edge-protection system to use, the project team needs to understand the risk it is trying to control.
Can exposure to the edge be eliminated altogether?
If it cannot, can the fall be prevented?
This is where physical edge protection plays an important role. A harness may be appropriate in some circumstances, but it is solving a different problem. Personal fall-arrest equipment manages the risk to an individual worker. A physical barrier can prevent someone reaching or falling through the edge in the first place.
For Project Engineers and Temporary Works Coordinators, that means edge protection belongs in the planning conversation.
Not simply on the procurement list.
A compliant post does not automatically create a compliant system
This is where the language around compliance can become misleading.
Imagine a tested edge-protection post installed onto a concrete structure.
The post itself may be perfectly capable of performing as designed.
But how has it been connected?
What loads are transferred through that connection?
What is the post spacing?
What is the condition of the concrete?
What is happening at the edge?
How is the system installed and removed?
What happens if the system is moved, struck or altered?
Those are not secondary questions, they are part of whether the installed edge protection is appropriate.
The complete system can include the post, rails or panels, connection, supporting structure, configuration, loading, installation method, inspections and site conditions. That is precisely what we mean by:
Compliance is a system, not a sticker.
The connection is part of the engineering
The connection between edge protection and the permanent structure is often treated as an installation detail. We think that is too late. On concrete, precast and civil projects, there may be several potential ways to connect an edge-protection system to the structure.
Depending on the application and project-specific engineering, that might include an existing or planned lifting anchor, ferrule, shear stud, EdgePro or hairpin anchor, another engineered connection, or a post-installed fixing.
There is no useful engineering rule that says one of those options is universally right and another universally wrong.
The better principle is this:
Make the connection method a deliberate engineering decision.
That matters because once the permanent structure is complete, the project's options have usually narrowed.
The reinforcement is fixed. Concrete has been poured. Precast units may already have been manufactured. Shop drawings have been signed off.
Now the team is solving an installation problem instead of designing the methodology it wanted in the first place.
Ask the connection question earlier
A much better time to think about edge protection is during design, precast detailing, constructability review or temporary-works planning.
At that stage, the project can ask where protection will be required and for how long. It can examine the structure and identify whether suitable connection points will already exist. Where appropriate, it can consider whether a connection should be incorporated into the design.
That gives the project team an opportunity to coordinate edge protection with the structure itself. Reinforcement, lifting arrangements, precast detailing, construction sequence and access can all be considered while there is still room to make choices.
The question changes from: “Where can we drill the posts?”
to: “What is the best way to connect the edge protection to this structure?”
That is a much more useful conversation.
Where NON-DRILL fits
NON-DRILL was developed around a straightforward idea: new post-pour drilled fixings should not automatically be the default way to connect edge protection to concrete.
Where the structure and project-specific engineering allow it, suitable existing or planned structural connection points can provide another option. That may include lifting anchors, ferrules, shear studs, EdgePro or hairpin anchors and other engineered connection arrangements.
But the word suitable matters. An existing anchor does not become an edge-protection connection simply because it happens to be there. Its type, capacity, condition, location, geometry and loads all need to be considered as part of the complete system - sometimes an existing connection will work, sometimes the better answer is to plan one during design, sometimes another fixing method will be appropriate.
NON-DRILL does not replace the engineering decision. It helps give the project team another engineering option before drilling becomes the default.
Installation is not the finish line
The same systems thinking applies after installation. Temporary edge protection has to remain appropriate for as long as workers rely on it.
Inspection requirements will vary with the application, system and jurisdiction, but the principle is straightforward: the condition of the installed system matters throughout its working life.
If something changes, the project needs to ask whether the system is still suitable.
Has it been moved?
Has somebody modified it?
Has it been struck?
Have site conditions changed?
Has weather affected it?
A system that was appropriate when first installed should not simply be assumed to remain appropriate regardless of what happens afterwards. Again, compliance lives in the system. Not on the sticker.
The five questions we think every project should ask
Before edge protection reaches site, we think the project conversation should cover five things:
What risk are we controlling? Understand the exposed edge, who needs access and whether the exposure can be eliminated or prevented.
What requirements apply? Confirm the relevant Standards, WHS obligations, project specifications, engineering requirements and approvals.
How will the system connect to the structure? Consider the connection, loads, geometry, structure and complete edge-protection configuration.
How will it be installed, removed and inspected? The methodology needs to work throughout the system's use, not simply on the day it arrives.
What evidence does the project need? Drawings, calculations, product documentation, approvals and inspection records all form part of a well-managed system.
None of those questions is particularly exotic. The trick is asking them early enough.
Edge protection should be designed as a control. Good edge protection is not simply about surrounding an exposed edge with rails. It is about creating a control that works with the structure, the construction sequence, the people using it and the conditions on the project. That is why NON-DRILL believes the connection deserves far more attention than it traditionally receives.
The best time to decide how edge protection will attach to the structure is not when somebody is already standing beside finished concrete wondering where to put the drill. It is when the project can still make the decision deliberately.
Design the control. Design the connection. Then select the system.
Because compliance is a system, not a sticker.
Discuss your project
If you are planning temporary edge protection for a bridge, precast, civil infrastructure or concrete project, talk to NON-DRILL while the connection methodology can still be influenced.
Tell us where the project is up to, what structure you are working with and what existing or proposed connections are available.