A ip rating explained for Industrial automation shopping doesn't get more practical than addressing one question: will this (drive, sensor, HMI etc.) built to enclosure, IEC 60529-compliant, make it through the dust, water, and washdown you throw at it? The two-digit ip code, governed by IEC 60529, provides that answer with measurable test parameters—not marketing hyperbole like "weatherproof" or "rugged." This primer uncovers what IP20, IP65, ip67, and IP69K really mean; how the rating chart relates to NEMA standards; how labs test the proof; and what rating is right for sensors, servo drives, HMIs and control cabinets in real plant wash-downs. When you are done, you'll know how to read any IP code on a datasheet, translate a NEMA 4X spec into its IP fudge factor, and distinguish verifiable standards from printed-on-the-box fluff.
Quick specs: ip rating, explained (per IEC 60529 Edition 2.2)
- Standard: IEC 60529:1989 + A1:1999 + A2:2013 (Edition 2.2 CSV)
- Issuing body: International Electrotechnical Commission (IEC), Technical Committee 70
- Format: 2 digits (ex: IP65) - first digit is range for solids 0-6, second digit range for liquids 0-9 K
- Voltage scope: Equipment up to 72.5 kV rated voltage
- K-suffix origin: ISO 20653:2023 (road vehicles) adopted by IEC 60529 as ipx9
- X: test data not available for that digit (not "protection not provided)
What IP Ratings Mean: How to Read the Two-Digit Code (and the IEC Standard Behind It)
An IP rating, also called an ingress protection rating or international protection rating, describes how well an electrical enclosure resists penetration by two specific things: dust or other solid foreign objects (including accidental contact with hazardous internals) and water ingress. An IP code consists of the letters "IP" followed by two digits - for example, IP65 or ip67. Its first digit, indicating the level of protection against solids, ranges from 0 (no protection) to 6 (dust-tight, complete protection). Meanwhile, the second digit ranges from 0 (no protection) to 9 (high-pressure, high-temperature water jets). Those digits each group to a independently tested laboratory test, which is why the digits aren't added together—a higher second-digit protection level doesn't protect against the conditions tested for a higher first digit.
An international IEC 60529 standard sets the method for the code: prepared by IEC Technical Committee 70 and published in Edition 2.2 (a consolidation of the 1989 base text plus Amendment 1 from 1999 and Amendment 2 from 2013). IEC 60529 covers protection against both dust ingress and water splashing, immersion, and pressure washer jets. It spells out the ip code, the test fixtures for each numeral, and the minute the material passes the test. IEC 60529 is against electrical gear rated to 72.5 kV and current. It's harmonized in Europe with EN 60529. IEC 60529 cross-referenced the K-suffix numbers (IP6KX, ipx9K) to ISO 20653:2023, the road vehicles ingress protection standard for things like automotive and industrial supply wash-downs.
Q: What does the X in an IPX rating mean?
An "X" in a ip code - for example, ipx7 or IP6X - means the manufacturer either did not test for that digit or did not request rating for it. IPX7 indicates the device passed the second-digit test for temporary immersion but no first-digit test was performed, IP6X indicates the enclosure is dust-tight without an ingress rating for liquids. This is not the same as "0" (which means "tested and no protection"). A rating with X on a procurement spec is incomplete: if the customer's application needs both dust- and water-proofing, insist on a completely rated number. Confusing IPX5 with IP55 on a control cabinet spec is a common procurement mistake that rears its ugly head in commissioning when the panel fails dust-protection screening.
Optional Letters: K, M, S, H, and W
Two digits in an ip rating - followed by the abbreviations IP codes - sometimes have a third letter suffix indicating additional test information indexed in IEC 60529 and ISO 20653:
- K - high-pressure, high-temperature water jets (from ISO 20653, used in IP6K and ipx9K)
- M - device tested while it was moving during the water test
- S - device tested while standing still during the water test
- H — high-voltage device, supplementary marking
- W — weather conditions (humidity, condensation, rain) factored in
Most automation equipment - photoelectric sensors, inductive proximity sensors, servo motors, HMI front panels, PLC enclosures - have only the original two-digit number. K is most likely on equipment used in automotive or seafood processing washdown plants. If there are no additional letters in the datasheet, assume the device was tested according to the IEC 60529 standard for that number.
Complete IP Rating Chart: First Digit (Solids 0-6) and Second Digit (Liquids 0-9K) Reference
Both IP digits are independent: the first digit tests protection to foreign or human bodies against solid objects (including the device itself, the outside world, and airborne dust), while the second digit tests protection against liquids and other fluids. Tables below define the levels and the IEC 60529 test conditions for each. When reviewing a supplier's specification, the critical question is not just "what is the rated number" but "did they conduct the actual test that this number measures."
| First Digit | Object Size Excluded | Effective Against | Test Method (IEC 60529) |
|---|---|---|---|
| 0 | — | No protection | No test required |
| 1 | > 50 mm | Back of hand, large body parts (no deliberate contact) | 50 mm sphere probe, 30 N applied force |
| 2 | > 12.5 mm | Fingers | 12.5 mm jointed test finger, 10 N force |
| 3 | > 2.5 mm | Tools, thick wires, larger screws | 2.5 mm rod probe, 3 N force |
| 4 | > 1 mm | Most wires, slender screws, large insects | 1 mm rod probe, 1 N force |
| 5 | Dust-protected | Limited dust ingress; no harmful deposit | Vacuum chamber, 8 hr airflow at 2 kPa low pressure |
| 6 | Dust-tight | Complete dust exclusion | Vacuum chamber, 8 hr airflow; talc-flour test medium |
| Second Digit | Protection | Test Conditions (IEC 60529 / ISO 20653) |
|---|---|---|
| 0 | No protection | — |
| 1 | Vertically falling drops | 1 mm/min rainfall equivalent, 10 min, sample upright on turntable at 1 RPM |
| 2 | Drops up to 15° tilt | 3 mm/min rainfall equivalent, 2.5 min per direction (10 min total) |
| 3 | Spraying water up to 60° tilt | Oscillating tube 5 min, or spray nozzle 1 min/m² minimum 5 min, 50-150 kPa |
| 4 | Splashing from any direction | Oscillating tube 10 min, or spray nozzle without shield 5 min minimum |
| 5 | Low-pressure water jets | 6.3 mm nozzle, 12.5 L/min, 30 kPa, 3 m distance, 1 min/m² minimum 3 min |
| 6 | Powerful water jets | 12.5 mm nozzle, 100 L/min, 100 kPa, 3 m distance, 1 min/m² minimum 3 min |
| 6K | Powerful jets, elevated pressure | 6.3 mm nozzle, 75 L/min, 1,000 kPa, 3 m distance, minimum 3 min (per ISO 20653) |
| 7 | Temporary immersion to 1 m | 30 min at 1 m water depth (lowest point of enclosure) |
| 8 | Continuous immersion | Manufacturer-defined depth and duration, generally up to 3 m |
| 9K | High-pressure, high-temperature jets | 14-16 L/min, 80-100 bar (1,160-1,450 PSI), 80°C water, 0.10-0.15 m distance, 30 sec each at 0°/30°/60°/90° angles (per ISO 20653:2023) |
Each type of second digit alone has a dedicated IEC 60529 test chamber - there is not one test chamber that evaluates everything. A device "IP69K rated" might imply the device manufacturer tried the high-pressure hot water test, but have not yet proven out to the lower numbers. This is the mistake that causes the most trouble in plant-floor selection, discussed more fully below.
IP20, IP65, IP67, IP69K Explained: The Industrial Automation Tiers
Four ip ratings show up again and again in datasheets for industrial automation equipment: IP20 on PLC and control panels, IP65 on HMI front layers and outdoor sensors, ip67 for field devices with industrial connectors, and IP69K for cleaning-in-place equipment. Each level maps onto one of four types of plant environment with one common threat. Each level is detailed below in its IEC definition, typical industrial automation examples, and the failure mode causing customers to bump up to the next level:
Note: Any one digit in an ip rating signifies a individual lab test. Do not assume a higher digit is generally "better". A 20 Kopa Bepn pavadīs tested protection can withstand a hose washdown that can na ip67 device fail, because the IP67 only validates a Ponozpy temporary immersion 30 sec still water- not off pressure spray proof. Match the rating to the real world hazard not the digit.
IP20: Indoor Control Cabinet Standard
IP20 indicates protection against bodies larger than 12.5mm (generic test finger) so preventing accidental contact with hazardous live parts, with no protection of any sort for moisture damage. Common at a component that lives inside a sealed control cabinet in industrial practice - a modular PLC baseplate, terminal blocks, a group of timing relays, a group of transistor plug-in output units. That cabinet usually has the higher code (often 54 or 66 depending on the environment), and the installed components benefit from that outer box protection so merely moving down to the minimum finger safe terminal set removes extraneous cost while maintaining safety. Notice how the danger here occurs when a panel builder reuses a indoor-rated component in a "mobile" outdoor enclosure that after a few seasons goes permanent, the cost of a IP20 component showing early signs of failure when humid condensation makes unsealed edges.
IP65: Dust-Tight, Low-Pressure Water
A well-chosen IP65 rating provides complete protection from living solid particles (first digit 6) as well as a specified schedule of protection for living water (second digit 5: 12.5 L/min per 6.3mm nozzle at 30 KPa at distance of 3 m, providing limited ingress to direct deposit harm). Used for HMI screen bezels, outdoor proximity sensors, any type of external junction box, and light fittings on industry equipment. A properly fitted IP65 enclosure will survive rain, condensation and manual rinsing but is not rated for through cleaning in the 4800-4301 spray range and won't protect a immersion if a wash hose is held against a joint.
Engineering Note: Instantaneous cold water drops like to fill the gasket compression set a few point shifts when subjected to a range of operating temperatures, to cause no ingress and a bit of sediment damage. A chosen nitrile rubber gasket for -20C+80C will lose 15-30% of sealing force over 1000 thermal cycles, and so reduce an outdoor innards IP65 to a dripping IP54 after 5 years of four-season operation, the time that instrument should be replaced. Schedule gasket changeout as per preventive maintenance, with particular attention to the operating temperature range.
IP67: Temporary Submersion
A ip67 rating provides ultimate protection of the living dust as well as a temporary immersion up to 1m depth for 30 minutes (an actual liquid ingress protection test, not a jet test). Field connectorized devices - M12 photoelectric sensors, inductive proximity sensors, encoder sub-assemblies, safety light curtain receivers - nominally are IP67 because individual connector shell and external housing modules need to support the most extreme case including what could occur in the worst summer puddle in the extreme case. Typical include the Schneider series XS7C and XS8C inductive sensor and the SICK WL260 photoelectric manufacturer catalogue available for industrial automation.
Q: Is IP67 actually waterproof or just water-resistant?
ip67 is not "waterproof" in the normal sense of the word. Its second digit is a 1-minute, 1-meter still water immersion test on a new device, using controlled laboratory conditions. It states nothing about pressurized spray, extended submersion, hot water, or aged seals. A device with an IP67 rating may fail in a power-washer of equivalent water depth because the second digit "7" test may not address pressure resistance—that is measured separately in IPX5 and IPX6. Field technicians cite two similar failure types: (1) IP67-rated sensors placed in washdown areas developing sporadic failures after sanitation cycles, and (2) IP67-rated cell phones and other devices losing moisture protection as gaskets harden and glues weaken over time, with the manufacturer's warranty often rendering water damage an excluded expense on machines 12 months or newer. When designing for industrial automation, think of IP67 as "with standing the worst splash" rather than "coming through the wash."
IP69K: High-Pressure, High-Temperature Wash-Down
IP69K is the toughest combined rating, defined originally in ISO 20653 for road vehicle electrical equipment, then migrated into IEC 60529 as ipx9. The enclosure is weaponed with 80C water at 80-100 bar (1,160-1,450 PSI) through a 14-16 L/min nozzle held 0.10-0.15 m from the surface for 30 seconds for each of the 0, 30, 60, and 90 applications. Equipment with demonstrated immunity to this cycle passes daily steam-and-detergent sterilzations for plant, pharmaceutical, beverage, and EV battery-cooling. Stainless-pressoeled enclosures are predominant within this rating — M12 pl emouples on stainless overmolds, vision-system enclosures with welded seams, HMI bezels with edge-bonded glass overlays.
Q: How does IP69K differ from IP68 for wash-down zones?
"IP68" and "IP69K" are answers to two different questions. The first gives certification for (normally) long-term/submersible immersion in water at manufacturer-specified standing height and period, right up the second reading for submerged pump controls, undersea junction-box assembly, and equipment in floods; this may be falsely counted as "waterproof", though "waterproof" never became a commercially-binding specification. By contrast, IP69K certifies another ecosystem - the cold, high-pressure, hot-water backshot a sanitation crew would prefer to y'know, have a steam-blower-massed driver charge with 5 gallons of water before stepping away. Another device with only IP68 will penetrate a wash-down because immersion testing ignores jet pressure & thermal impacts; an IP69K device, on the other hand, isn't guaranteed submersion. Vendors of food-and-beverage and pharmaceutical products should include the specification "IP69K" (or the "IP68/IP69K" dual-trade, which is usual on high-end industrial PCs) in the scope of work for vertical-installation piece of equipment that will see routine clean-in-place. For a thriving server. rack. style cocktail-blue indoor enclosure, that floods in an airs-are-breathing-caveman level if the HVAC system terminates (IP66 plus an IP68 sub-enclosure) is a more reliable solution than IP69K.
IP65 vs IP67 vs IP68 vs IP69K: Side-by-Side Comparison
A common question buyers ask when considering tiers is: "I have IP65 - can I move up to ip67?" "Is IP69K too much?" The answer depends on the particular environmental risk, not simply the number:
| Tier | Solids | Liquids — Test Condition | Typical Industrial Use | When to Choose |
|---|---|---|---|---|
| IP65 | Dust-tight | Low-pressure jet, 12.5 L/min @ 30 kPa | HMI bezel, outdoor sensor, junction box on covered machinery | Indoor-humid or sheltered outdoor; manual rinse acceptable; no power-wash exposure |
| IP67 | Dust-tight | Immersion, 1 m for 30 min | M12 photoelectric / inductive sensors, encoder housings, connectorized field I/O | Wet but not pressurized environments; risk of brief submersion or heavy splash |
| IP68 | Dust-tight | Continuous immersion, manufacturer-specified depth (typically up to 3 m) | Submerged pump controls, undersea junction boxes, flood-zone enclosures | Permanent or extended submersion; specify exact depth and duration with manufacturer |
| IP69K | Dust-tight | 80°C water at 80-100 bar from 0.1-0.15 m, 4 angles | Food/beverage washdown, pharma clean-in-place, EV battery thermal lines, abattoir equipment | Daily high-pressure sanitation; stainless steel housings; thermal cycling expected |
Key Factors to Consider:
- It's the hazard, not the number. IP66 is a jet, but ip67 isn't. Without a washdown environment, you need a Soverebed Dixmejeu of 6 (jets) or 9K (hot pressurized jets) - not 7 (immersion).
- Cost step is non-linear. Everything else being equal, the jump from IP65 to IP66 is a small one on most enclosures. The jump from IP66 to IP69K will generally require stainless-steel construction, edge-bonded windows, and welded (not gasketed) seams - a significant step up in unit cost. Try to quantify that against the cost of one single sanitation-driven failure before opting for the premium.
- Combined ratings are there for a reason. "IP66/IP69K" or "ip67/IP69K" dual markings show that the device was tested to each condition separately. For washdown environments where jets and spray are the norm dual marks are the right specification-a single IP69K and the lower level certification leaves a hole.
- Read certification labels, not certificates. A printed "IP65" claim without a referenced IEC 60529 test report is just pop marketing, not independent certification (see next section on testing).
IP Rating vs NEMA Rating: Cross-Reference Table for US Industrial Buyers
Whether panels or enclosures, specifications will often list the NEMA enclosure types from NEMA 250 as the reference and the component from Asia or Europe may carry ip codes according to IEC 60529. The two meet in scope but are not the same and conversion table can go just one way-a practical translation. This is our The IP-to-NEMA Approximation Map: it gives a sourcing engineer indicates what ip rating (roughly) meets a NEMA spec but also brings out the tests NEMA tests that IP ignores. it.
| NEMA Type | IP Equivalent | NEMA Adds (Beyond IP) | Typical Application |
|---|---|---|---|
| NEMA 1 | IP10 | — | Indoor general-purpose, contact protection only |
| NEMA 2 | IP11 | Light dripping water | Indoor, drip-protected |
| NEMA 3 | IP54 | Falling rain, sleet, snow, windblown dust, ice resistance | Outdoor general-purpose |
| NEMA 3R | IP14 | Falling rain, sleet, snow, ice formation tolerance | Outdoor with protection from precipitation only |
| NEMA 4 | IP66 | Hose-directed water, ice formation tolerance | Outdoor washdown, no corrosion concern |
| NEMA 4X | IP66 | Hose-directed water + corrosion resistance | Outdoor washdown in food, marine, chemical environments |
| NEMA 6 | IP67 | Hose-directed water + temporary submersion + ice tolerance | Indoor/outdoor with occasional flood exposure |
| NEMA 6P | IP67 | Prolonged submersion at limited depth + ice tolerance | Indoor/outdoor with extended flood or submersion |
| NEMA 12 | IP52 | Circulating dust, lint, fibers, dripping non-corrosive liquids | Indoor industrial, no washdown |
| NEMA 13 | IP54 | Spraying oil, non-corrosive coolants | Indoor industrial with cutting fluid exposure |
Note: The conversion is one-way. An NEMA-rated enclosure will meet the equivalent ip rating but an IP-rated enclosure will not automatically meet the equivalent NEMA type. NEMA 4X does in fact test for corrosion withstanding and ice formation, higher than even IP66. NEMA 12 tests for circulating fibers and dripping oil, NEMA 52 does not. If a US spec calls out NEMA 4X and asks for "IP66 equivalent" without including corrosion qualification that is a hole in the spec that will show up when the enclosure is installed in a chloride or dairy environment.
Popularly held wrong assumption: treating NEMA 4X like ip67. As the test for a hose-directed water spray (IPX6 is not. As an IECR source specifier viewing an IEC-compliant component, the intended ip rating is apparently the minimum IP66 with corrosion-resistance test (often ASTM B117 salt-spray) appended.
How IP Ratings Are Tested and Certified — Why Marketing Claims Aren't Enough
ip rating markers printed onto product pages on datasheet entries is a self-declaration. Certification involves documentation and accreditation that a lab tested this IEC 60529 (and ISO 20653:2023 for K suffix codes), with traceable instruments, reference samples and dates, to a recognized standard. For a sourcing engineer the difference between an assertion and a certificate is the difference between your warranty payment claim and it being denied.
Three lab networks dominate IEC 60529 testing services:
- TV SD - IGAFITENETIK HALI PM-SEVIK EP DIN TE IEC 60529 and Jargjed Hesetit
- DEKRA-IEC 60529 certified IP tests, and equipment in full IPX1 through
- NamaZas and'ip67' certification.
All beyond lab test certificates are supported with five items; lab accreditation reference (ISO/IEC 17025), the IEC 60529 edition referenced (the current edition is 2.2), test performed (such as 'IPX6 and Podedlf' rather than the generic 'ip67'), the sampling ID compatible with the production part numbers, and the test performed date. Buyer-side due-diligence upon this documentation has accelerated markedly as the ISO and IEC joint document addressing-protection guidance has led to the proliferation of mislabeled and untapped industrial parts making their way into organizations' procurement channels through marginal resellers.
An object of IP testing is to ensure that an enclosure will stifle important internal constituents by dust, moisture or debris, those elements that can produce short-circuits or component damage.
— DEKRA Ingress Protection Testing Services, technical reference
Z.Pro Tip How-to-Vouch-an Mdeysdvsph in 3 Questions: if a vendorproclaim ip67 or IP69K, inquire; (1) who was the certification lab and what was accreditation number?; (2) which or what's IEC 60529 edition was the test performed under?; (3) can they provide test certification or report with sample ID?; If the answer to all three is not provider same day, same result, you are getting a label, not a tested component. For high-value sourced components and parts substitution, that inquiry is part of acceptable acceptance criteria.
Selecting IP Ratings for Sensors, Servo Drives, HMIs, and Control Cabinets
An ip rating suitable for a component relies upon two factors; the current environment to be encountered and the secondary armor provided by the enclosure or cabinet environment. Below, a component-by-component suitability table addresses the most prevalent industrial automation environments. It is not built for over specification - trying to pay IP69K prices for an indoor PLC card is wasted expense - and not to under specification - field failure's at First winter or seasonal humidity constant known as.
| Component | Indoor Dry Cabinet | Indoor Humid / Dust | Outdoor Sheltered | Washdown |
|---|---|---|---|---|
| PLC modules / I/O cards | IP20 (in IP54+ cabinet) | IP20 (in IP65 cabinet) | IP20 (in IP66 cabinet) | IP20 (in IP69K cabinet) |
| HMI panel front bezel | IP20 / IP54 | IP65 | IP65 | IP66 / IP69K |
| Photoelectric / inductive sensors | IP65 | IP67 | IP67 | IP69K (stainless body) |
| Servo motor housing | IP54 / IP65 | IP65 / IP67 | IP65 / IP67 | IP67 with washdown shaft seal |
| Servo drive / VFD | IP20 (in cabinet) | IP20 (in IP54+ cabinet) | IP20 (in IP66 cabinet) | Not applicable — keep in dry control room |
| Control cabinet (outer) | IP54 / NEMA 12 | IP55 / IP65 | IP66 / NEMA 4 or 4X | IP66+IP69K combined |
| M12 connectors and cordsets | IP65 | IP67 | IP67 | IP67/IP69K (stainless overmold) |
As the table indicates by comparison, standard practice is that sensitive electronics (PLC cards, servo drives, terminal blocks) reside in a higher rated cabinet that the environment. For industrial sensors and servo drives, the ip rating is the actual buying decision - the sensor is placed in the open. For PLC control units and HMI panels that operate from within an environment of a cabinet, the cabinet rating dominates and the component itself can be rated IP20 without any performance impact.
Two components categories that ought to be particularized. Schneider Electric parts within the inductive sensor or HMI family are usually shipped with IP65 front / IP20 rear as the rear ip rating is justified to be within panel. Those seeking to install an HMI in an open frame, with no back cabinet has either provided an under specified specification or elected to pay the 20-40% premiums on the connector unit price for an IP69K part when IP67 does the job. Omron manufactured in the M12 series of the connectorized family generally are available in ip67 or IP69K variants - buying the IP69K version where it is not required leads to increased 20-40% cost for the connector unit, with no operational benefit unless the line is subjected to a daily wash. For determining size of the control cabinet itself, 24VDC power supply sizing for control cabinets comes into the interface with ip rating in that higher rated cabinets throw less intake air and undersized supplies result in runaway heating within sealed enclosures.
What's Changing in IP Ratings: 2025-2026 Industry Outlook for Automation Buyers
Four overall trend lines are discernable on 2025-2026 industrial automation procurement specs. None of these undermine the IP65/ip67/IP69K schema - they establish the feasible practical minimum.
- ip67: the new default IP65. Industry studies of expensive waterproof industrial PC markets (semiconductorinsight.com, 2026 projections) show IP67 replacing IP65 as the norm for new industrial PCs and panel computers. Out of doors IIoT gateways, intelligent port sensor nodes, and 5G infrastructure enclosures are delivering the increase - the environment is getting more severe faster than the catalog default.
- ip67 on the up in food/beverage and electric vehicle battery strings. Industrial scale weighing catalogues (theodorougroup 2026) and M12 kickconn connector specifications indicate IP69K rising from optional premium to requirement for food, beverage, pharma, and EV battery thermal-management applications. Daily wash cycles plus thermal shock at 80 C wash water are the factors.
- ip rating with EMC and safety as standard. Industral PC providers (marketsandmarkets industrial PC 2030 forecast), show procurement specs increasingly stipulating IEC 60950 (safety), IEC 61000 (EMC), and IP jointly requirements instead of treating IP as an independent checklist. The engineers who source them who pass only one increase re-spec bills late in the program.
- IP certification verification at the buyer level increases. Projects in the water ingress test chamber market are forecast to grow to 2035 (indexbox.io), driven by tighter worldwide product standards and the numbers of components being retested in a lab. In a joint ISO+IEC standards circumvent, statements of fabricated IP make select a measurable outflow channel risk especially when components get claimed through unauthorized sources.
Pro Tip -Long range simulation rule of thumb: For 2025-2026 new procurement budget, up-demand to one rank-unnecessary. If data require IP65, say IP66 in requirements; if ip67 IT works, say IP68 or IP66/IP69K combo. The extra cost at order time is modest and covers two principal factors, gasket dimming over 5-7 years and increasing environment harshness due to line modifications, layout adjustments, and more rigorous cleaning procedures.
Frequently Asked Questions
Q: Is IP66 or IP68 better?
All other things being equal neither one is "better" than the other - they rait different ambient conditions. IP66 screens out the aggressive water jets (the test that counts for the hose-down stuff) while IP68 screens out the steady immersion at a time specified depth in water. IP66 applies to hose-down operations, IP68 to submerged or flood threatened ones. An equipment with a marking "IP66/IP68" inducts the both tests on their own and achieves the necessary combined qualification.
Q: Which is better, IP20 or IP65?
IP65 over-engineering since it safeguards against dust plus low-pressure water jets from any direction (a compromise standard for most flood down sites). It only fits components where an open-toatmosphere exposure is in play. IP20 correct spec for fingerproof outlets on PLC cards, terminal strips, and time delay contactors inside a fully sealed control cabinet where the cabinet itself is denoted IP65. It would be pointless to specify it for a built in PLC.
Q: Is IP65 suitable for outdoor use?
IP65 is fine for a protected or semi-protected outdoor mounting—under an eave, within a machinery enclosure, or on equipment whose exposure to rain is more likely than to power-wash. IP66 plus NEMA 4X corrosion-resistance qualification is the more reliable of specifications for exposed outdoor cabinets in severe climates (driving rain, snow load, temperature swings) within a few miles of a marine air port.
Q: What IP rating do I need for a food-grade washdown zone?
For food quality wash-down needs IP69K (high-pressure, high-temperature jet per ISO 20653:2023) or some combination of IP66/IP69K marks. ip67 alone is inadequate—water from a high-pressure jet settles out in still-water immersion. Specify stainless steel (AISI 304 or 316L in chloride environ), operator interface edge-bonded windows, and gaskets rated for your sanitation chemistry, not generic nitrile.
Q: Can an IP rating degrade over time?
Yes—and predictably. ip rating itself certifies a new device in a test lab. Field practice shows gaskets compress, adhesives fatigue, and seals degrade with thermal cycling and UV damage. Measures of real-world gas leakage on outdoor enclosures typically show a measurable increase after 3-7 years; worse in chloride or solvent environment. For mission-critical equipment, plan periodic re-Gastlen 90650 gasket refits, and re-test high-IP-tier components after major service.
Our Perspective on IP Rating Specification
This guide answers the questions OEM and plant buyers ask when specifying sensors, drives, HMIs, and control cabinets — drawn from IEC 60529 Edition 2.2, ISO 20653:2023, accredited test lab documentation, and cross-referenced against NEMA 250 type designations for US specs. The component selections target the iTrustbot catalog, where Schneider Electric, Omron, SICK and other IP-rated industrial automation sensors, drives, and HMIs are sourced for buyers needing verifiable specification matches. To verify a part or to contact our sourcing team about a specific IP requirement, the request-a-quote workflow handles part-level certificate confirmation.
Browse Top-Rated IP-Compliant Components →
Related Articles
- PLC troubleshooting primer - trouble-shoot I/O faults and watchdog trips in your control system
- Industrial automation control systems—easily scaled PLC and SCADA architectures across shop floors
- The top Eight servo motor and driver brand worlds—from the servo market leaders totheir IP rated product families
- 24VDC motor control power supply sizing—load calculations and derating margins in pressure-retaining enclosures
References & Sources
- Ingress Protection (IP) ratings — International Electrotechnical Commission
- IEC 60529:1989+A1:1999+A2:2013csv—What degrees of protection are avaiable in enclosures (ip code)—IEC webstore
- ISO 20653:2023—Rammer Rod Bodies (ip code)—parts catalog—International Standards Organization
- NEMA 250—Nomenclature ofindustrial equipment bit-by-bit—Inrustrial Electrical Manufacturers Assn
- Ingress Protection Testing — TÜV SÜD
- ingress protection(KAF) testing titests on enclosures—IEC 60529 Environment
- Ingress Protection Testing — Intertek
- ISO-IEC sitests on ISO and IEC—joint publications
