On this page
A safe fire rating tells you how many minutes the safe kept its interior below a set temperature during a laboratory furnace test. A 60-minute rating for paper means that, under test conditions, the inside stayed cool enough for paper documents for an hour while the outside was exposed to a standard fire. The minutes describe a controlled test, not a promise about every real fire, so the rating is best used to compare safes and to choose a sensible safety margin.
This article explains what 30, 60, 90 and 120 minutes actually measure, which test standards sit behind them, and how we help customers choose. For the bigger picture on fire protection, including filing cabinets, data safes and bushfire planning, see our complete guide to fire-resistant safes.
What a Safe Fire Rating Actually Measures
A fire-resistant safe is a steel box with insulation built into the walls and door. In a fire, that insulation slows the heat moving inward. The test measures how long the inside stays under a limit chosen for the item being protected.
That limit depends on the contents. Paper tolerates far more heat than hard drives, USB sticks or film, so a rating is always “minutes for something”. A safe rated 120 minutes for paper may offer much less protection for a portable hard drive. That is the reason hard drives and backups need a dedicated data safe rather than a standard document safe.
A fire rating also says nothing about burglary resistance. Fire insulation and burglary armour are different things, and many fire safes have thin steel skins. Our article on how cash ratings and fire ratings differ covers that trade-off in detail.
The Test Standards Behind the Minutes
Most fire ratings on safes sold in Australia come from internationally recognised test standards. The safes we sell are usually tested to one of the following. The product page or the label inside the door should name the standard.
NT Fire 017 (Nordic test method)
Many safes in our range carry an NT Fire 017 rating. The Nordtest method exposes an empty cabinet to a furnace that follows the ISO 834 standard fire curve. It sets three classes:
- Paper: for media that do not lose information below 170°C. The inside may rise no more than 150°C above the starting temperature.
- Data: for normal magnetic media that do not lose information below 70°C. The allowed rise is 50°C.
- Diskette: for more sensitive media that do not lose information below 50°C. The allowed rise is just 30°C.
Ratings are issued as 60, 90 or 120 minutes, written as “NT Fire 017 – 120 Paper”, for example. The Platinum Doco DC1000 is listed with an NT Fire 017 – 120 Paper certification.
UL 72 (North American standard)
UL 72 uses classes named after the maximum interior temperature in Fahrenheit. Class 350 (177°C) is for paper records. Class 150 (66°C) is intended for paper plus magnetic tapes and photographic records. Class 125 (52°C) also covers more sensitive computer media. Classes 150 and 125 limit humidity inside the unit as well as temperature. Units sold as impact resistant also pass a fire and impact test that includes a drop of about 9 metres (30 feet).
European standards
EN 15659 covers lighter fire storage units for paper with 30- or 60-minute levels. EN 1047-1 covers heavier data cabinets with S 60 and S 120 levels and protection classes for paper and data media. If a product lists one of these, the class letters tell you what it was tested to protect.
Does 60 Minutes Mean It Survives a 60-Minute Fire?
Not exactly. The furnace follows a set curve, while a real fire can be hotter or cooler, shorter or longer, and can bury a safe under debris. Heat also keeps soaking inward after the flames are out, because the walls and rubble stay hot. No safe is completely fireproof, which we explain in our article on why no safe is truly fireproof.
House fires also move faster than most people expect. The Victorian Government notes that a small fire can grow to involve an entire room in just two to three minutes. How long a building then burns depends on what is in it, how it is built and how quickly firefighters arrive. That variability is why we treat the rating as a comparison tool and buy a margin above what we think we need.
One detail from the Nordtest method is worth knowing: the cabinet is normally tested with the door latched but not locked. The seal comes from the door being properly closed. A door left ajar provides little protection, so make closing the safe a habit even when you are only stepping away.
Choosing the Right Safe Fire Rating for Home or Office
There is no single correct number. These are the factors we talk through with customers in our Tullamarine showroom:
- What you are storing. Paper only, or paper plus USB drives, hard drives and photos? Media changes the class you need, not just the minutes.
- How replaceable it is. Passports and certificates can be reissued with some effort. Original wills, handwritten records and family photos often cannot.
- Distance from help. A home near a fire station is in a different position from a rural property with a long response time.
- Where the safe sits. A safe in a room full of furniture, books or a car in the garage faces a bigger fire load than one in a hallway cupboard.
- Burglary risk. If you also store cash or jewellery, you may want a safe that carries both a fire rating and a cash rating.
A practical starting point
| Rating | Usually suits | In our range (prices change) |
|---|---|---|
| 30 minutes | Basic protection for replaceable papers, often combined with a cash rating | Secuguard Fire & Burglary Safe FA22E from around $594 |
| 60 minutes | The most common rating in our range; a sensible minimum for most homes | Compact Locktech fire safes from under $500 |
| 90 minutes | Homes with irreplaceable papers, larger home offices | Platinum Doco DC610 from around $779 |
| 120 minutes | Business records, rural properties, high-value archives | Platinum Doco DC1000 from around $1,563 |
Prices are taken from our current catalogue and change with supplier pricing, so check the product page for today’s figure. You can compare models side by side in our fire-resistant safe range.
For offices with a lot of paperwork, a safe may not be the most efficient format. Drawer-based units store far more files per square metre, and our guide to choosing a fire-resistant filing cabinet for the office compares the options.
Reading the Label and Looking After the Rating
Before you buy, check three things on the product page or certification label:
- The standard (NT Fire 017, UL 72, EN 15659, EN 1047-1 or similar).
- The class (paper, data or diskette, or the equivalent letters).
- The minutes the unit achieved in that test.
Be cautious with labels that say “fireproof” without naming a test. Our guide to safe ratings and standards explains how fire ratings sit alongside Australian cash ratings and other certifications.
A rating also depends on the safe staying in good condition. Insulation can be damaged if a safe is dropped or roughly handled, and a safe that has already been through a fire should be replaced. We cover the warning signs in how long a fire safe lasts and when to replace it. Many fire safes are also lighter than burglary safes, so bolting them down matters. Our team can handle professional safe installation in Melbourne and through our national network.
Frequently Asked Questions
What does a 60-minute fire rating on a safe mean?
It means the safe kept its interior below the limit for its content class for 60 minutes in a laboratory furnace test. For a paper rating under NT Fire 017, the inside could rise no more than 150°C above its starting temperature. It is a controlled comparison, so real fires may be shorter, longer, hotter or cooler than the test.
Is a 30-minute fire safe enough for a home?
A 30-minute safe gives basic protection and suits replaceable papers, especially when it also carries a cash rating. For original wills, property papers or family records that cannot be replaced, we usually suggest at least 60 minutes. If you live a long way from a fire station, consider 90 or 120 minutes for a bigger margin.
Does a paper fire rating protect USB drives and hard drives?
Not reliably. Paper ratings allow interior temperatures far above what many digital media can tolerate. Under NT Fire 017, data cabinets allow only a 50°C rise and diskette cabinets 30°C, compared with 150°C for paper. For hard drives, USB sticks and backup media, choose a safe rated for data or fit a data insert.
Which fire test standard is best?
No single standard is best for every buyer. NT Fire 017, UL 72, EN 15659 and EN 1047-1 are all recognised tests. What matters most is that the label names a real standard, states the content class you need (paper or data) and gives the minutes achieved. Be wary of “fireproof” claims that name no test.
Compare Fire Ratings in Person
The easiest way to understand fire ratings is to compare safes side by side. Our Tullamarine showroom at 38 Barrie Rd has over 350 new and used safes on display, and our team brings a combined 50+ years’ experience in safes. Call us on 0409 860 011 (Monday to Friday, 9am to 5pm) or send us your fire safe question and we will recommend a rating that suits what you store.
