Structure of the IP Code to DIN EN 60529
The IP code (Ingress Protection) is defined in the international standard IEC 60529, implemented in Germany as DIN EN 60529. It describes how well an electrical enclosure is protected against the ingress of solid bodies, dust and water. The code follows the pattern:
| Element | Meaning | Range |
|---|---|---|
| 1st digit | Protection against solid bodies and dust | 0 – 6 |
| 2nd digit | Protection against water | 0 – 9 (+ K) |
| Letter (opt.) | Personal protection: A = back of hand, B = finger, C = tool, D = wire | A / B / C / D |
| Additional letter (opt.) | Special conditions: H = high voltage, M = test during movement, S = test at standstill, W = weather protection | H / M / S / W |
1st Digit: Protection against solids (0–6)
| Digit | Degree of protection against foreign bodies / dust |
|---|---|
| 0 | No protection |
| 1 | Protection against solid bodies > 50 mm (e.g. back of hand) |
| 2 | Protection against solid bodies > 12 mm (e.g. fingers) |
| 3 | Protection against solid bodies > 2.5 mm (tools, wires) |
| 4 | Protection against solid bodies > 1 mm (thin wires) |
| 5 | Dust-protected — no harmful dust ingress (not completely sealed) |
| 6 | Dust-tight — no dust penetrates (completely sealed) |
2nd Digit: Water protection (0–9K)
| Digit | Degree of protection against water |
|---|---|
| 0 | No protection |
| 1 | Vertical dripping water (1 mm/min for 10 min) |
| 2 | Drip water up to 15° inclination |
| 3 | Spray water up to 60° from the vertical |
| 4 | Splash water from any direction |
| 5 | Jet water (nozzle ø 6.3 mm) from any direction |
| 6 | Strong water jets (nozzle ø 12.5 mm) from any direction |
| 7 | Short-term submersion (1 m depth, 30 min) |
| 8 | Permanent immersion (conditions defined by the manufacturer) |
| 9K | High-pressure steam jet cleaning (DIN 40050-9): 80–100 bar, 80°C, 14–16 l/min |
Key Takeaway: IP54 = First digit 5 (dust-protected, not completely sealed) + second digit 4 (splash water from any direction). IP65 = Dust-tight + water jets. Each higher number includes the requirements of the lower levels.
Reference Table IP00–IP69K
All relevant IP combinations at a glance. The table can be filtered and sorted by each column.
| IP code | Solids protection | Water protection | Typical application |
|---|---|---|---|
| IP00 | No protection | No protection | Open transformers, test laboratory |
| IP10 | Protection against body > 50 mm | No protection | Space heaters (open at the top) |
| IP11 | Protection against body > 50 mm | Vertical dripping water | Simple household motors |
| IP12 | Protection against body > 50 mm | Drip water up to 15° inclination | Household appliances, lighting |
| IP13 | Protection against body > 50 mm | Spray water up to 60° | Power tools, hand tools |
| IP20 | Protection against fingers (> 12 mm) | No protection | Enclosure interior components |
| IP21 | Protection against fingers | Vertical dripping water | Office equipment, household electronics |
| IP22 | Protection against fingers | Drip water up to 15° inclination | Indoor systems with slight moisture |
| IP23 | Protection against fingers | Spray water up to 60° | Covered outdoor areas |
| IP24 | Protection against fingers | Splash water from any direction | Simple washing systems |
| IP30 | Protection against tools (> 2.5 mm) | No protection | Control units in dry indoor areas |
| IP40 | Protection against wires (> 1 mm) | No protection | Indoor units without water contact |
| IP41 | Protection against wires | Vertical dripping water | Ceiling lights, fans inside |
| IP42 | Protection against wires | Drip water up to 15° inclination | Electric motors for dry indoor systems |
| IP43 | Protection against wires | Spray water up to 60° | Motors covered outside |
| IP44 | Protection against wires | Splash water from any direction | Compressors, machine interior |
| IP50 | Dust-protected | No protection | Devices without water contact in dusty environments |
| IP54 | Dust-protected | Splash water from any direction | Standard industrial motors (TEFC) |
| IP55 | Dust-protected | Water jets from any direction | Outdoor installation, covered outdoor areas |
| IP56 | Dust-protected | Strong water jets from any direction | Ship decks, washing areas (light) |
| IP57 | Dust-protected | Short-term immersion (1 m / 30 min) | Agricultural machinery, construction machinery |
| IP65 | Dust-tight (completely) | Water jets from any direction | Food industry, wash-down |
| IP66 | Dust-tight | Strong water jets from any direction | Heavy machinery outdoors, offshore |
| IP67 | Dust-tight | Submersion up to 1 m / 30 min | Cold-storage areas, wet rooms, mining |
| IP68 | Dust-tight | Continuous immersion (manufacturer's specification) | Submersible pumps, underwater actuators |
| IP69 | Dust-tight | High-pressure hot water (general) | Heavy-duty industrial cleaning |
| IP69K | Dust-tight | High-pressure steam jet (DIN 40050-9) | Food and pharmaceutical industry (CIP/SIP) |
IP ratings highlighted in bold are particularly common in drive technology.
Key IP Ratings in Drive Technology
Five IP ratings are particularly relevant for electric motors, gearboxes and actuators in industrial applications. Here are the most important details for your design decision.
IP54 — Standard Industrial Motors
IP54 is the most common protection rating for enclosed industrial motors (TEFC — Totally Enclosed Fan-Cooled) to IEC 60034-5. The first digit 5 means dust-protected: dust can penetrate, but not in harmful quantities. The second digit 4 (splash water) permits use in dry to slightly damp production halls.
Typical for: Standard conveyor technology, fans, pumps in dry halls, machine tools (without coolant contact).
IP55 — Outdoor Installation
IP55 differs from IP54 only in the second digit: 5 (water jets) instead of 4 (splash water). The dust protection is identical. In practice, the difference matters when cleaning with a hose or operating outdoors in direct rainfall.
Typical for: Rooftop or open-air installation, cooling towers, covered outdoor storage, wastewater treatment.
IP65 — Dust-Tight + Water Jet (Wash-Down)
IP65 provides complete dust protection (digit 6) and protection against water jets (digit 5). This is the minimum requirement for drives in food processing, where regular cleaning is carried out with a hose or low-pressure spray equipment. Crucial: the enclosure must be completely closed — no ventilation slots, no open cable entries.
Typical for: Food processing, beverage bottling, pharmaceutical plants, chemical industry (cleaning areas).
IP66 / IP67 — Powerful Water Jets and Short-Term Immersion
IP66 protects against powerful water jets (larger nozzle, higher pressure than IP65). IP67 additionally protects against brief submersion to 1 m depth for 30 minutes. In practice, many engineers specify IP67 for applications where occasional flooding from cleaning water or process moisture may occur — even when routine submersion is not planned.
Typical for: Cold-storage areas (condensation and thaw water), mining, marine applications, pressure-spray systems, commercial kitchens.
IP69K — High-Pressure Steam Jet Cleaning (DIN 40050-9)
IP69K is the most demanding standard protection rating and is based on DIN 40050-9. Test conditions: 80–100 bar water pressure, 80°C water temperature, 14–16 l/min flow rate, nozzle distance 10–15 cm, 30 seconds per side. These conditions arise with industrial high-pressure cleaners and CIP systems (cleaning-in-place).
Important: an IP69K motor requires special shaft seals (double-acting radial lip seal, PTFE lip), pressure- and temperature-resistant sealing materials, and a gap-free enclosure geometry. Not every IP65 motor can be upgraded to IP69K with simple additional measures.
Typical for: Slaughterhouses, dairies, breweries, pharmaceutical production, CIP systems, commercial kitchens with daily high-pressure cleaning.
IP vs. NEMA Type: Comparison Table
In North America, the NEMA system (National Electrical Manufacturers Association) is used. The following table shows approximate equivalents between NEMA type and IP rating.
| NEMA Type | IP equivalent (approx.) | Application |
|---|---|---|
| NEMA 1 | IP10 | Indoors, general basic protection |
| NEMA 3 | IP54 | Outdoors, weather and dust protection |
| NEMA 3R | IP14 | Outdoors, rain protection without dust protection |
| NEMA 4 | IP56 | Indoor/outdoor, hose-down and water jets |
| NEMA 4X | IP56 + corrosion protection | Like NEMA 4, plus stainless steel or GRP for corrosive environments |
| NEMA 6 | IP67 | Brief submersion |
| NEMA 6P | IP68 | Prolonged submersion |
| NEMA 12 | IP54 | Indoors, protection against dust and oil drips |
| NEMA 13 | IP54 | Indoors, oil and dust protection, spray water |
Note: NEMA ≠ IEC. The equivalences are technical approximations — not normative one-to-one equivalents. NEMA types and IP ratings differ in test methods, test conditions and depth of requirements. For international projects, always verify both standards separately.
Practical Selection Guide: Industry → Recommended IP Rating
The matrix below provides minimum IP rating recommendations by sector and ambient conditions. The rating actually required depends on the specific installation situation, cleaning regime and applicable standards of the respective industry.
| Industry / Environment | Minimum IP rating | Note |
|---|---|---|
| Mechanical engineering, dry production hall | IP54 | Standard TEFC motor sufficient |
| Outdoor installation in general | IP55 | Weather protection + anti-corrosion coating |
| Food processing (wash-down) | IP65 | Dust-tight, no splash water in the housing |
| High-pressure cleaning / CIP / SIP | IP69K | Explicitly prescribe DIN 40050-9 |
| Pharma / Cleanroom | IP65 | Also observe Hygienic Design (EHEDG) |
| Machine tool with coolant | IP65-IP67 | Observe coolant pressure and chemistry |
| Mining / Underground mining | IP67 | Additionally check ATEX/IECEx explosion-protection requirements |
| Ship / offshore application | IP56-IP67 | Saltwater corrosion: stainless steel / special coating |
Common mistakes and misunderstandings
Mistake 1: IP rating ≠ protection of bearings and shaft seals
The IP rating describes the protection of the motor enclosure — not that of the bearings or shaft seals. An IP65 motor can still leak oil at the shaft exit if the radial lip seal is not suited to the prevailing conditions (speed, temperature, medium). Bearings and shaft seals must always be specified separately.
Mistake 2: IP65 instead of IP69K for high-pressure cleaning
A common and costly mistake: IP65 motors are installed in systems where high-pressure washers (80+ bar) are used daily. Standard IP65 motors are rated for low-pressure water jets (≤ 30 bar). Under high-pressure conditions, seals can fail, water can ingress and winding damage can result. Always specify IP69K explicitly — do not treat it as a sub-category of IP65.
Mistake 3: Equating IP rating and hygienic design
An IP69K motor made of galvanized cast steel with grease nipples and cooling fins is unsuitable for the food industry — regardless of its IP rating. Hygienic design also requires: smooth, gap-free external surfaces (no germ harbours), corrosion-resistant materials (stainless steel 304/316L, FDA-compliant polymers), food-grade NSF-H1 lubricants and self-draining geometry. IP rating and hygienic design are orthogonal requirements.
Mistake 4: Cable entries as the weakest link
An IP67 motor with an IP54 cable gland on the terminal box effectively provides only IP54. The overall system is only as tight as its weakest link. Ensure that cable glands, connectors, blanking plugs and conduit seals carry at least the same IP rating as the motor enclosure — if in doubt, go one rating higher, as mechanical stress from vibration and temperature cycling can reduce sealing effectiveness in service.
Practical note: when shaft penetrations limit the achievable IP rating
Where shaft penetrations structurally limit the achievable IP rating, system designers turn to non-contact magnetic couplings (PMKC) as an alternative to sealed drives. These separate the drivetrain completely and hermetically — without a rotating seal and therefore without the typical wear and leakage risks of sealed shaft penetrations.
Not sure which IP rating you need? Our application engineers can help.
Whether an IP54 standard motor or an IP69K special version for the food industry — TEA Hamburg advises you on the right motor selection and supplies all components from a single source.
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