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AS 1530.1-1994/R2016 AS 1657-2018
Fire Safety: More Than Just the Panels
Fire safety in a solar installation is a multi-layered issue. The panels themselves must be rated for combustibility, but so must the materials used to seal roof penetrations, the conduit run through roof spaces, and the wiring insulation in confined areas where heat builds up.
AS 1530.1-1994/R2016 — Methods for Fire Tests: Combustibility of Materials
This standard provides the test method for determining whether a material is non-combustible. It is referenced extensively by the National Construction Code (NCC) for materials used in roof construction and penetrations.
What This Means for Solar Installations
Material / Component | Fire Requirement | AS 1530.1 Relevance |
|---|---|---|
Roof penetration seals (conduit boots) | Must maintain roof fire rating | Seal material must be non-combustible or tested |
Solar panel backsheet | IEC 61730 Class A minimum for most roofs | Panel manufacturer references fire class rating |
Conduit in roof cavity | Must meet NCC Spec C1.10 in attached buildings | PVC conduit restrictions above fire-rated ceilings |
Roof racking system | Non-combustible (aluminium, steel) | Plastic components assessed for combustibility |
Cable insulation in enclosed spaces | Low-smoke halogen-free (LSHF) preferred | Self-extinguishing insulation only in roof cavities |
The Solar Panel Fire Risk — What Installers Must Know
Solar panels themselves do not cause fires in normal operation, but they can create fire hazards through:
DC arc faults — a sustained DC arc in a connector or cable joint can ignite nearby combustible materials. This is why AS/NZS 5033 mandates arc fault protection in certain configurations
Panel hotspots — a cracked or shadowed cell creates localised heat. Panels must meet IEC 61730-2 for mechanical loading and fire class
Inverter fires — inverters must meet AS 62109 (Safety of power converters) and must be mounted away from combustible materials with appropriate clearances
Rapid shutdown failure — if firefighters cannot de-energise DC strings quickly, roof-level panels remain live. AS 5033 and some network requirements now mandate rapid shutdown provisions
For Fire Brigades: Roof-mounted solar panels remain energised as long as there is daylight, even when the inverter is switched off and the main switch is open. DC voltage in string arrays can be 300–600 V. Safe working distance from energised panels is at least 1 metre per 1,000 V DC.
AS 1657-2018 — Fixed Platforms, Walkways, Stairways and Ladders
This standard governs safe roof access for installation and ongoing maintenance. It is often overlooked in residential solar but becomes critical in commercial rooftop installations where workers will regularly access the roof for cleaning, inspection, and fault-finding.
Key Requirements for Solar Access Systems
Element | AS 1657-2018 Requirement |
|---|---|
Roof ladder (cat ladder) | Minimum 450 mm clear width, maximum 300 mm rung spacing, non-slip rungs |
Walkway width (alongside panels) | Minimum 550 mm clear for single-person access |
Edge protection | Guardrail min 900 mm high where fall height exceeds 2 m |
Load rating | Walkways must support minimum 2.5 kPa imposed load |
Anti-slip surface | Grating or mesh flooring — walkway must drain freely |
Signage | Access points must be signed with hazard identification |
When AS 1657 Applies to Your Solar Installation
Always applies when roof pitch exceeds 10° and panel access for maintenance is required
Always applies to commercial rooftop installations with regular scheduled maintenance
Strongly recommended for residential systems where panels are installed above single-storey eave height
Required by most councils for ground-mounted systems with elevated panel arrays
Fall Protection — Working at Heights
While AS 1657 covers fixed access equipment, all roof work in Australia is also governed by the Work Health and Safety (WHS) Regulations and the Code of Practice: Managing the Risk of Falls. Installers must:
Use edge protection, static lines, or roof anchor points during installation
Never use a ladder as a work platform on a pitched roof
Document a Safe Work Method Statement (SWMS) before any roof work above 2 m
Engr. Jason Morales — Founder, SolarEnergyPH