What does RSC mean on a gun safe?

Residential Security Container, a burglary rating under UL 1037. At level I the safe resisted one person with hand tools and a small drill for five minutes of working time. Levels II and III mean ten minutes against two people with power tools.

Do I need a gun safe in California?

Since 1 January 2026, a firearm kept in a home must be securely stored whenever it is not carried or close enough to its owner to stop anyone else reaching it — in a gun safe that meets the state standard, or with a lock certified by the Department of Justice. A safe is one way to comply, not the only one.

Should a gun safe be bolted down?

If it is designed to be, yes. UL runs the level I test with the safe installed as intended — anchored, if that is how it was designed — and levels II and III must either weigh at least 750 pounds or come with anchor hardware.

Gun safes · United States

What a gun safe rating actually tests

Most gun safes sold in the United States make two claims: a burglary label — usually UL's Residential Security Container, or RSC — and a fire rating in minutes. Below, each one is read from the standard or the statute behind it: what it covers, and what it leaves out.

RSC LEVEL I IS FIVE MINUTES, ONE PERSON, HAND TOOLS. A real test — and the bottom of the scale.

RSC — the burglary label on most gun safes

RSC comes from UL 1037, a standard for antitheft devices. Until its 2016 revision it had a single level: five minutes against one person with common hand tools. The revision kept that test as attack level I and added two harder ones. Sellers usually write them as RSC Level I, II and III.

Level	Net working time	Who attacks	Tools allowed	Fails if
I	5 min	One operator who knows how the container is built	Hammers with heads up to 3 lb (1.36 kg), chisels, pry bars, punches, screwdrivers and wrenches, none longer than 18 inches (457 mm); a variable-speed drill with bits up to ¼ inch (6.4 mm)	The door opens, or a hole 4 inches (102 mm) across appears in any surface
II	10 min	Two experienced operators and a test director	Any common hand tools, picking tools, portable mechanical and electric tools, grinding points, drills up to ½ inch (12.7 mm), pressure devices	The door opens, or an opening of 6 square inches (38.7 cm²) goes through the door or front face
III	10 min	The same team	Everything allowed at level II, plus abrasive cutting wheels and power saws	The door opens, or an opening of 2 square inches (12.9 cm²) goes through the door or the body

Net working time is time with a tool on the safe; the clock stops when the tools come off. Note what each level counts as a failure: at level I, a hand-sized hole in any wall; at level II, a smaller hole, through the door or front face; at level III, a smaller one still, through the door or the body.

Levels II and III set rules for the box, not just the attack Both require a certified lock — a UL 768 combination lock (Group 2M for level II, Group 1 for level III) or a UL 2058 high-security electronic lock — and either a weight of at least 750 pounds (340 kg) or anchor hardware with instructions for fixing the safe to a permanent surface or to the building.

The level I test is run with the safe positioned as intended for use, and a safe designed to be fixed to the building is installed that way before the attack. A safe meant to be bolted down and left standing loose is not the safe that passed.

For scale: UL 687, the standard for commercial burglary safes, starts at TL-15 — fifteen minutes on the door against hand, picking and portable electric tools — and rises to TL-30 and beyond. All ratings compared › Germany sets its legal floor for firearms on a different scale altogether, EN 1143-1 Grade 0. Which grade the law asks for ›

Is a gun safe fireproof?

No safe is. A fire rating is a time and a temperature: the inside must stay below a limit while the outside sits in a furnace. Gun safes usually carry one of four kinds of fire claim, and they are not the same test.

What the label says	Furnace	Time	Inside must stay below	Tested by
UL 72 Class 350, 1 hour	Rising to 1700°F (927°C)	One hour, then cooling inside the closed furnace	350°F (177°C)	UL, which adds an explosion test: the locked safe goes into a furnace preheated to 2000°F (1093°C) for 30 minutes
UL 72 Class 350, 2 hours	Rising to 1850°F (1010°C)	Two hours, then cooling	350°F (177°C)	UL
ETL, for example “60 minutes at 1200°F”	1200°F (649°C)	As stated; American Security's ETL-tested gun safes run from 30 to 120 minutes	350°F (177°C)	Intertek (ETL)
“Fire rated”, no laboratory named	not stated	not stated	not stated	The manufacturer

So “60 minutes” on a gun safe and “1 hour” on a UL label describe different fires: 1200°F against 1700°F, and only the UL rating adds the explosion test. Both manufacturers quoted below warn against fire claims that no independent laboratory has checked.

A higher UL class number is not a better rating. In UL 72 the number is the interior limit in °F: Class 350 is for paper, Class 150 for film and magnetic media, Class 125 for digital media, the last two with humidity limits as well. Every fire label compared ›

Is a gun safe required in California?

Not as such — but since 1 January 2026, safe storage is. Section 25145 of the California Penal Code requires anyone who keeps a firearm in a residence to store it securely whenever it is not being carried, or kept close enough to its owner (or another authorized user) to stop anyone else reaching it. “Securely stored” means inside, locked by or disabled with a firearm safety device certified by the state Department of Justice, or kept in a gun safe that meets the state's standard. A certified lock satisfies the law as well as a safe does.

A first violation carries a fine of up to $250, a second up to $500; a third is a misdemeanor. Unloaded antique firearms and permanently inoperable ones are exempt.

The state's standard for a gun safe — section 4100 of Title 11 of the California Code of Regulations — can be met in two ways:

a listing by a nationally recognized testing laboratory as a UL Residential Security Container — the RSC label above; or
construction to minimums: a combination lock with at least 10,000 combinations, protected by a hardened drill-resistant plate; at least three steel locking bolts, each at least ½ inch thick; walls of at least 12-gauge steel, or two walls totalling at least 0.100 inch; a door of 7-gauge steel plate or two layers of 12-gauge; and hinges protected against removal.

A gun safe does not have to be tested by the state: under section 23635 it can meet the standard without appearing on the Department of Justice roster. Every gun a dealer sells in California must come with a certified safety device; one exemption is a buyer who owns a qualifying safe and shows the original receipt — so keep it. A long-gun safe sold in the state that does not meet the standard must say so in a printed warning on its package and on the front of the safe.

Separately, sections 25100 and 25105 make careless storage a crime when a child, or a person barred from owning a gun, gets hold of the firearm and someone is hurt or it is carried in public — and, where a child is likely to get it, even before anything happens. A firearm that is securely stored in the sense above falls outside them.

This is the statute text, summarised It is not legal advice, and other states set their own rules. Read the current text on the California Legislative Information site before relying on it.

Short answers

What does RSC mean on a gun safe? Residential Security Container, a burglary rating under UL 1037. At level I the safe resisted one person with hand tools and a small drill for five minutes of working time. Levels II and III mean ten minutes against two people with power tools.
Is a gun safe fireproof? No. A fire rating means the inside stayed below 350°F for a stated time in a furnace at a stated temperature. Check which laboratory tested it and at what heat: sixty minutes at 1200°F, a typical ETL rating, is a milder fire than UL's one hour at 1700°F.
Is RSC the same as TL-15? No. TL-15 comes from UL 687, the commercial burglary standard: fifteen minutes on the door against hand, picking and portable electric tools. RSC level I is five minutes against hand tools and a drill no wider than a quarter inch.
Do I need a gun safe in California? Since 1 January 2026, a firearm kept in a home must be securely stored whenever it is not carried or close enough to its owner to stop anyone else reaching it — in a gun safe that meets the state standard, or with a lock certified by the Department of Justice. A safe is one way to comply, not the only one.
Should a gun safe be bolted down? If it is designed to be, yes. UL runs the level I test with the safe installed as intended — anchored, if that is how it was designed — and levels II and III must either weigh at least 750 pounds or come with anchor hardware.

What every rating certifies STANDARDS Questions to ask the seller QUESTIONS The safe won't open LOCKED OUT Which lock do I have? LOCKS

Where this comes from

Every source above was read on 18 Oct 2026. If one of them changes or disappears, the line that rests on it is corrected or removed — see method.