The short answer
The IP code comes from IEC 60529 and has two digits. The first digit rates protection against solids and dust on a 0 to 6 scale, where 5 means dust-protected (limited, non-harmful ingress) and 6 means fully dust-tight. The second digit rates water on a 0 to 8 scale plus a separate 9K, where 5 is low-pressure jets, 6 is powerful jets, 7 is temporary immersion to 1 meter for 30 minutes, and 8 is continuous immersion deeper than 1 meter. For outdoor cameras the practical answer: IP65 (dust-tight plus 6.3 mm water jets) suits soffit and eave mounts sheltered from direct weather; IP66 (dust-tight plus 12.5 mm powerful jets) is the sensible default for open wall, pole, or corner mounts with no overhang; IP67 or IP68 is for ground-level, flood-prone, splash-zone, or wash-down locations.
IK is a separate scale, IEC 62262, covering mechanical impact and vandal resistance from IK00 to IK10, where IK08 equals 5 joules and IK10 equals 20 joules. Two cautions drive most field mistakes. First, the IP second digit is not strictly cumulative: the immersion tests (7 and 8) use static water while the jet tests (5 and 6) use dynamic pressure, so an IP67 device is not guaranteed to survive a pressure hose. Devices needing both carry a dual mark such as IP66/IP67 or IP69K. Second, the IP code says nothing about temperature, ultraviolet exposure, salt, corrosion, or internal condensation. Those live in a separate operating-temperature spec (commonly around -30 C to +60 C) and material ratings, which you must read independently of the IP number.
Which Rating for Which Mount: A Selection Framework
Start with the physical exposure of the mounting point, not the marketing label on the box. The IP code answers two questions only: can dust get in, and can water get in under defined conditions. Match the second digit to how much moving water the device will actually meet. A camera tucked under a deep soffit or eave never sees a direct pressure jet, so IP65 (dust-tight plus 6.3 mm, 12.5 L/min jets) is coherent. A camera on an open wall, pole, or building corner meets wind-driven rain and, eventually, a pressure washer, so IP66 (12.5 mm, 100 L/min jets) is the defensible default.
Move to IP67 or IP68 only where standing or immersing water is credible: ground-level bollards, low fence lines, irrigation splash zones, boat docks, car-wash bays, or gate hardware near pooling water. IP67 covers 30 minutes at 1 meter; IP68 covers continuous immersion at a manufacturer-defined depth. Because immersion and jet tests differ, a device exposed to both hoses and flooding should carry a dual IP66/IP67 mark rather than IP67 alone.
Layer IK impact resistance on top wherever reach or vandalism is a factor: eye-level, entryway, school, retail, and parking installs warrant IK08 (5 J) at minimum, IK10 (20 J) for public ground-floor vandal domes.
- Soffit / eave, sheltered from direct rain: IP65 is typically sufficient (dust-tight, low-pressure jets).
- Open wall, pole, or corner, wind-driven rain and future pressure-washing: IP66 recommended.
- Ground-level, flood-prone, irrigation or wash-down zones: IP67 (1 m, 30 min) or IP68 (continuous, deeper).
- Needs both jet and immersion protection: require a dual mark such as IP66/IP67 or IP69K.
- Reachable, public, or vandal-exposed housings: add IK08 (5 J) minimum, IK10 (20 J) for ground-floor domes.
- Always cross-check the separate operating-temperature range; IP does not cover heat, cold, or UV.
The IP Code Decoded: Every Digit in IEC 60529
An IP marking reads IP followed by two characters, for example IP65. The first digit is solids and dust protection; the second is liquids. An X in either position means that characteristic was not tested or not specified, so IPX7 states a water rating with no declared dust rating, and IP6X states dust-tight with no declared water rating. Optional letters can follow (for example an added letter for access to hazardous parts, or supplementary letters), but the two numerals carry the core rating.
First digit (solids), 0 to 6: 0 no protection; 1 objects over 50 mm (a hand); 2 over 12.5 mm (a finger); 3 over 2.5 mm (tools, thick wire); 4 over 1 mm (most wires and screws); 5 dust-protected, meaning limited ingress that does not impair operation; 6 dust-tight, no ingress. Levels 5 and 6 are the only ones meaningful for outdoor electronics.
Second digit (liquids), 0 to 8 plus 9K: 0 none; 1 vertical drips; 2 drips at 15 degrees tilt; 3 spraying to 60 degrees from vertical; 4 splashing from any direction; 5 low-pressure jets; 6 powerful jets; 7 temporary immersion; 8 continuous immersion; 9K high-pressure, high-temperature close-range jets.
- First digit 5 = dust-protected (limited, non-harmful ingress); 6 = dust-tight (zero ingress).
- Second digit 4 = splashing water any direction; 5 = 6.3 mm jets; 6 = 12.5 mm powerful jets.
- Second digit 7 = immersion to 1 m for 30 min; 8 = continuous immersion, manufacturer-defined depth.
- 9K (from ISO 20653, adopted as IPx9 in IEC 60529:2013) = ~80 C water, ~8-10 MPa, close-range jets.
- X marks an untested position: IPX7 has no declared dust rating; IP6X has no declared water rating.
- The two numerals are the rating; trailing letters are supplementary and do not change the digit meanings.
IPX5 vs IPX6 vs IPX7 vs IPX8: The Real Test Conditions
The water digits are not vague grades; each is a defined bench test. IPX5 sprays a 6.3 mm nozzle at 12.5 L/min (roughly 30 kPa) from 2.5 to 3 meters, for a minimum of about 3 minutes. IPX6 escalates to a 12.5 mm nozzle at 100 L/min (roughly 100 kPa) from the same distance and duration. The jump from 5 to 6 is a large increase in volume and momentum, which is why IP66 is the meaningful threshold for surviving a garden or pressure hose.
IPX7 is a static immersion test: the enclosure is submerged so its lowest point sits at 1 meter and its highest point is at least 150 mm below the surface, held for 30 minutes. IPX8 covers continuous immersion beyond 1 meter under conditions the manufacturer specifies, so an IP68 depth figure is only meaningful when the datasheet states the depth and time it was verified against.
Because jets are dynamic and immersion is static, passing IPX7 does not prove IPX6 performance. A seal that resists standing water can still be driven open by a focused jet. This is why serious outdoor gear is dual-marked, and why you should not read IP67 as automatically superior to IP66.
- IPX5: 6.3 mm nozzle, 12.5 L/min (approx. 30 kPa), 2.5-3 m distance, min ~3 minutes.
- IPX6: 12.5 mm nozzle, 100 L/min (approx. 100 kPa), 2.5-3 m distance, min ~3 minutes.
- IPX7: submersion, lowest point at 1 m and top at least 150 mm under water, 30 minutes.
- IPX8: continuous immersion beyond 1 m at a depth and time defined by the manufacturer.
- Jet vs immersion are different mechanisms; IPX7 does not guarantee IPX6, so dual marks exist.
- An IP68 claim is only as good as the stated depth and duration on the datasheet.
IK Impact and Vandal Resistance (IEC 62262)
Impact resistance is a distinct standard, IEC 62262, expressed as IK00 through IK10. It is verified by striking the enclosure with a defined mass from a defined height to deliver a specified impact energy in joules. The energy roughly doubles or more at each of the higher steps, so the gap between IK08 and IK10 is substantial: 5 joules versus 20 joules, a fourfold increase.
The full scale, in joules: IK01 0.14; IK02 0.20; IK03 0.35; IK04 0.50; IK05 0.70; IK06 1; IK07 2; IK08 5; IK09 10; IK10 20. As reference points, IK08 (5 J) corresponds to about a 1.7 kg mass dropped 295 mm, and IK10 (20 J) to about a 5 kg mass dropped 400 mm. IK is independent of IP: a camera can be IP67 with no stated IK rating, or IP66 IK10.
For camera housings, match IK to reach and risk. Domes at ceiling height in a controlled office rarely need more than IK08. Public-facing, ground-floor, school, transit, and parking-structure domes benefit from IK10, which is why vandal-dome product lines advertise it prominently.
- IK scale runs IK00 to IK10; the standard does not define a higher grade within IEC 62262.
- IK08 = 5 J (about 1.7 kg from 295 mm); IK09 = 10 J; IK10 = 20 J (about 5 kg from 400 mm).
- Lower steps for reference: IK06 = 1 J, IK07 = 2 J.
- IK is separate from IP; a device can carry one, both, or neither rating.
- Eye-level and public ground-floor housings: specify IK10 vandal domes.
- Ceiling-height indoor or protected mounts: IK08 is usually adequate.
What IP and IK Do Not Tell You
The most common specification error is treating the IP number as a complete weather rating. It is not. IEC 60529 tests dust and water ingress at room-ish conditions; it does not evaluate temperature extremes, thermal cycling, ultraviolet degradation, salt fog, corrosion, or internal condensation. A device can be fully IP66 and still fail in a Houston summer attic soffit or a coastal salt environment because those stresses are governed by separate specs.
Read the operating-temperature range as a first-class requirement. Outdoor cameras commonly specify roughly -30 C to +60 C, with some rated -40 C and many adding an internal heater for cold-start below freezing. Direct sun on a dark housing can push internal temperature well above ambient, so verify the upper bound against real rooftop or wall exposure, not just shade air temperature. UV-stable housings and gaskets matter for multi-year service; ordinary plastics chalk and embrittle.
Finally, ratings describe the sealed enclosure as tested, not the installation. Cable entries, unused gland holes, upward-facing connectors, and a cracked gasket after a lens adjustment all defeat the rating. Bottom-facing cable exits and dielectric grease on connectors preserve it; sealing the wall penetration is a separate step the IP number never covers.
- IP tests dust and water only; it excludes temperature, UV, salt, corrosion, and condensation.
- Check operating temperature separately; outdoor cameras commonly span about -30 C to +60 C.
- Sun-loaded dark housings run hotter than ambient; verify the upper temperature bound in real exposure.
- UV-stable housing and gasket materials matter for multi-year outdoor life.
- The rating applies to the sealed unit as tested, not to unsealed cable entries or gland holes.
- Face connectors and cable exits downward and seal wall penetrations; IP does not cover the install.
NEMA Cross-Reference and Quick Selection Recap
North American enclosures are often marked to NEMA (NEMA 250) rather than IP, and the two are not perfectly interchangeable because NEMA adds requirements IP omits, notably corrosion resistance and certain environmental factors. As widely used approximate crosswalks: NEMA 3R is roughly comparable to IP14-class rain protection, NEMA 4 to about IP66, NEMA 4X to IP66 plus corrosion resistance, and NEMA 6P to about IP67/IP68 for prolonged submersion. A NEMA-to-IP mapping is one-directional in spirit: a NEMA rating implies the IP equivalent more safely than the reverse, since IP does not test corrosion.
Putting it together for a typical outdoor camera or floodlight-camera spec: require first digit 6 (dust-tight) for any exterior electronics, then choose the water digit by exposure, and add IK where reach invites impact. IP66 dust-tight plus powerful-jet protection covers the majority of exterior wall and pole mounts; step to IP67 for splash and flood zones, and specify IK10 for vandal-exposed domes.
When a location combines heat load, water, reach, and long cable runs, the enclosure rating is only one variable among sealing practice, gland selection, and drip loops, which is where a careful field install earns its keep.
- NEMA adds corrosion and other factors IP omits; the mappings below are approximate, not exact.
- NEMA 4 approximates IP66; NEMA 4X adds corrosion resistance to that level.
- NEMA 6P approximates IP67/IP68 for prolonged or continuous submersion.
- Exterior electronics: require first digit 6 (dust-tight) as a baseline.
- IP66 covers most exterior wall and pole camera mounts; IP67 for splash and flood zones.
- Enclosure rating is necessary but not sufficient; sealing, glands, and drip loops complete the job.
Frequently asked questions
Is IP68 always better than IP66 for an outdoor camera?
Not necessarily, because they test different things. IP66 verifies resistance to powerful 12.5 mm water jets (dynamic pressure), while IP67 and IP68 verify static immersion. A seal tuned for immersion can still be forced open by a focused pressure-washer jet. For most exterior wall and pole cameras, IP66 is the relevant threshold. Choose IP67/IP68 only when standing or immersing water is credible, and for locations that see both hoses and flooding, look for a dual IP66/IP67 (or IP69K) mark rather than IP67 alone.
What IP rating do I need for a camera mounted under a soffit or eave?
IP65 is typically sufficient when the mount is genuinely sheltered from direct, wind-driven rain and never meets a pressure jet. IP65 is dust-tight and resists low-pressure 6.3 mm jets at 12.5 L/min. If the soffit is shallow, the corner is exposed to blowing rain, or the location will ever be pressure-washed, step up to IP66 for the larger 12.5 mm, 100 L/min jet protection. The added cost is small relative to a water-intrusion failure.
Does a higher IP rating mean the device handles heat and cold better?
No. IEC 60529 only rates ingress of dust and water. It says nothing about temperature range, thermal cycling, UV exposure, salt, or corrosion. You must read the operating-temperature spec separately; outdoor cameras commonly list roughly -30 C to +60 C, sometimes with an internal heater for cold starts. In strong sun a dark housing runs hotter than ambient, so verify the upper limit against real exposure, not shade temperature.
What does the X mean in a rating like IPX7 or IP6X?
The X marks a position that was not tested or not specified. IPX7 declares a water rating (immersion to 1 m for 30 minutes) but makes no claim about dust; IP6X declares dust-tight with no stated water rating. A fully specified outdoor device should show real numbers in both positions, for example IP66 or IP67. Treat an X as missing information and ask for the complete rating.
How does IK08 differ from IK10 for vandal-resistant housings?
IK ratings (IEC 62262) measure impact energy. IK08 withstands 5 joules, roughly a 1.7 kg mass dropped 295 mm; IK10 withstands 20 joules, roughly a 5 kg mass dropped 400 mm, a fourfold increase. Use IK08 for protected, ceiling-height indoor domes. Specify IK10 for reachable, public, ground-floor, school, transit, or parking-structure domes where deliberate impact is a realistic risk. IK is independent of the IP water rating, so confirm both.
