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Why Labelling Is a Safety Issue, Not Just Paperwork
Inadequate or missing labels on a solar system are one of the most commonly cited defects in electrical safety audits. In an emergency, an unlabelled isolator could mean a firefighter or emergency electrician makes a fatal error. AS/NZS 5033 Amendment 2 introduced the most comprehensive labelling requirements to date for Australian solar installations.
Complete Label Inventory — AS/NZS 5033 Amd 2
Label | Minimum Content | Location |
|---|---|---|
DC Danger Warning | "DANGER — DC VOLTAGE — [calculated VOC] V" | Array DC isolator, combiner box |
Do Not Disconnect Under Load | "CAUTION — PV ARRAY — Do not disconnect under load" | All DC junction boxes, combiner boxes, isolators |
Dual Supply Warning | "SOLAR PV SYSTEM INSTALLED — This switchboard has two or more supply sources" | Main switchboard cover |
Solar Isolation Switch ID | Direction to nearest solar isolation switch location | Meter box / switchboard |
Array Configuration | Number of strings, panels per string, VOC, ISC | Near inverter or on inverter door |
Energy Storage Warning | "CAUTION — ENERGY STORAGE SYSTEM — Disconnect battery before working" | Battery enclosure / inverter-charger |
Label Material and Durability Requirements
Labels must be permanently fixed — adhesive labels are acceptable only if rated for outdoor UV exposure (minimum 10-year life)
Engraved or embossed labels are preferred for rooftop locations
Minimum text height: 6 mm for warnings, 4 mm for informational text
Colour: Safety yellow or white background with black text for most labels; red background for danger warnings
Must remain legible after 25 years of service — test by reference to AS 2700 colour standard for UV fading
Labels That Are Frequently Missed
The dual-supply warning on the switchboard — every solar job requires this, but it is often forgotten
Labels on both ends of every DC conduit run (especially inside roof cavities)
The calculated maximum VOC at minimum site temperature — not just the STC VOC from the panel datasheet
Engr. Jason Morales — Founder, SolarEnergyPH
