Switchboard Fire Protection Sealing in Commercial Buildings: Why Clause 2.10.7 Keeps Getting Missed
Clause 2.10.7 of AS/NZS 3000:2018 requires switchboard wiring to be installed so that fire cannot spread yet Building and Energy continues to find an unacceptably high proportion of breaches at inspection. Here is what you need to know.
The new switchboard goes in. The DIN rail kit replaces the old panel. The work looks clean, the circuits test correctly, and the notice of completion goes through. What the certificate does not capture is the gap at the back of the board an open cavity connecting the switchboard directly to the wall space behind it. If a fault ignites a fire inside that board, there is nothing to stop it from spreading.
This scenario plays out on commercial building sites and in existing facilities across Western Australia with more regularity than most people in the industry would expect. Building and Energy's own publication, Electrical Focus Issue 1 (September 2019), puts the problem plainly: "An unacceptable high proportion of Clause 2.10.7 breaches persist. These breaches continue to be found during installation inspections despite repeated efforts by network operators to encourage compliance."
What the Standard Requires
Clause 2.10.7 of AS/NZS 3000:2018 is the governing requirement. It states: "Wiring associated with switchboards shall be installed in such a manner that, in the event of fire originating at the switchboard, the spread of fire will be kept to a minimum."
That is the complete obligation. It does not specify a single approved product or method, which is important to understand. As Building and Energy notes, "while there are no specific standards for switchboard fire-sealing, acceptable methods are available to achieve the objectives of Clause 2.10.7, such as using fire-rated materials." The choice of method belongs to the contractor and the employed electrician, but the responsibility to make that choice and to make it well sits squarely with them.
The DIN Rail Kit Problem
The most common failure pattern involves the replacement of older switchboard panels with DIN rail kits. These kits are widely used and, when installed correctly, work well. The problem arises when the upgrade stops short of proper sealing. Building and Energy is direct about this: "Simply replacing older switchboard panels with a DIN Kit, leaving the back of a switchboard open to the wall cavity is unacceptable. The board must be properly sealed."
A wall cavity is not a harmless void. In a commercial building, cavities connect to ceiling spaces, roof voids, and adjoining areas. An unsealed switchboard creates a direct pathway for fire to travel through the building fabric, well beyond the point of origin. It undermines both the intent of the wiring rules and the fire compartmentalisation that the building's passive fire protection is designed to provide.
Selecting the Right Sealing Method
Because there is no single mandated product, the appropriate approach varies by installation. Building and Energy states that "the most effective approach to fire sealing will depend on the type and location of the switchboards and the number and sizes of cable entries involved. Contractors and their employed electricians are expected to assess these and select the most appropriate sealing method for the situation at hand."
For a commercial facility manager or builder managing a project, this means verifying at handover that the sealing question has been addressed not just that the board is operational. A switchboard that passes functional testing but leaves cable penetrations open to a wall cavity is a non-compliant installation.
How Building and Energy Treats These Breaches
There is no ambiguity about the regulatory view of clause 2.10.7 failures. Building and Energy classifies them at the highest level of concern: "Failure to comply with Clause 2.10.7 is a serious defect, regarded as such by network operators and Building and Energy." Serious defects identified during inspection require rectification before connection or continued use they are not items that can be deferred to a later maintenance cycle.
The consistent finding of these breaches across installation inspections suggests the issue is not ignorance of the requirement but rather a tendency to treat fire sealing as a finishing detail rather than a core installation obligation. In a commercial context where switchboards serve multiple tenancies, where wall cavities extend across large floor plates, and where the consequences of fire spread are significant that approach carries real risk.
If you are planning a commercial switchboard upgrade or new installation in Western Australia, ensure your electrical contractor's scope explicitly addresses clause 2.10.7 compliance before work begins. Leemont is happy to talk through what proper fire sealing looks like for your site.
