IP Rating Guide: IP44 to IP69K Decoded for Australian Industry

An IP rating tells you — precisely and verifiably — what level of protection a piece of equipment has against solid particles and liquids. Dust, water jets, rain, temporary immersion, high-pressure steam cleaning: each scenario corresponds to a specific code, tested against a specific standard. If you're selecting a motor for a food-processing washdown area, specifying a luminaire for an outdoor switchroom, wiring a bathroom under AS/NZS 3000, or choosing a hoist for an outdoor marine facility, the IP code is not advisory — it's the specification you build on.

This guide decodes the full IP rating system from first principles: what each digit means, how ratings relate to one another (and where they emphatically don't stack), what Australian standards mandate in specific environments, and how to match an IP rating to your actual application. It also covers what IP ratings don't include — impact protection, UV resistance, corrosion, and temperature — so you're never left with a false sense of security from a rating that doesn't address the real hazard.

What is an IP rating and what does it actually tell you?

IP stands for Ingress Protection, defined by the international standard IEC 60529, adopted in Australia as AS/NZS 60529:2025. The rating communicates, via a two-digit code, the degree of protection an enclosure provides against two distinct threats: the ingress of solid particles and the ingress of liquids.

The format is always IP followed by two characters. Each character is a digit from 0 upward. When one position is not tested or rated, it is replaced by the letter X. IPX4 means liquid protection has been tested to level 4 (splashing from all directions), but solid particle protection has not been assessed. This is common for consumer products where only the liquid rating is claimed. Critically, X means not tested, not no protection — the distinction matters when evaluating fitness for purpose.

What IP ratings cover:

• Solid particle ingress — from large objects down to fine dust
• Liquid ingress — from vertically dripping water up to high-pressure immersion

What IP ratings do not cover — and where confusion frequently leads to specification errors:

• Mechanical impact — that's the IK rating system (IEC 62262), a completely separate standard
• UV radiation and sunlight degradation — a plastic IP67 enclosure may degrade and become brittle under sustained UV even though its ingress rating is unaffected in laboratory conditions
• Corrosion — an aluminium IP66 enclosure and a 316 stainless steel IP66 enclosure carry the same water rating; in a coastal salt environment they perform very differently
• Explosive atmospheres — that's Ex/ATEX/IECEx certification, a separate compliance regime entirely
• Temperature extremes — operating temperature range is a separate specification
• Condensation from temperature cycling — an IP67 enclosure sealed against ingress can still accumulate internal condensation if the enclosure breathes through thermal expansion. Breather vents or desiccants are the engineering solution, not a higher IP rating

How to read the IP code: the first digit (solid particle protection)

The first digit indicates protection against the ingress of solid foreign objects, from large physical contacts at level 1 down to fine dust at level 6. The test objects range from 50 mm spheres (the size of a closed hand) to standardised dust under vacuum pressure.

In Australian industrial practice, the first digit is almost always 4, 5, or 6. Equipment rated below IP4x should not be used in workshop environments where swarf, wire off-cuts, or insects are present. IP5x (dust-protected) is appropriate for most standard industrial environments including concrete and timber fabrication, grain handling, and light aggregate processing. IP6x (dust-tight) is required for fine-powder environments — flour, pharmaceutical powders, cement — and for any equipment that will be pressure washed, because dust-tight also means washdown-compatible at the housing level.

The practical distinction between IP5x and IP6x is not just about the particles themselves. Because IP6x enclosures are sealed to a vacuum standard, they also provide a stronger foundation for the liquid sealing. Most IP65, IP66, IP67, and IP68 rated products carry the 6 first digit — the high-performance liquid seals require a housing design that is inherently dust-tight.

How to read the IP code: the second digit (liquid ingress protection)

The second digit indicates protection against liquid ingress — specifically water in various forms and energies. The standard scale runs from 0 (no protection) to 8 (continuous immersion), each at a defined test pressure, flow rate, nozzle size, and duration. A ninth designation — 9K — exists outside IEC 60529 and requires separate explanation.

The most important principle of the second digit: these ratings are not hierarchical for the liquid scale. An enclosure rated IP67 (immersion) has not necessarily passed IP66 (powerful jets). The dynamic pressure of a 100 L/min jet at 100 kPa is an entirely different failure mechanism from the static pressure of 1 m immersion depth (~12.5 kPa). A gasket that holds under static immersion may fail under the concentrated impact force of a high-pressure jet. Specify the rating that matches your actual use case — not the highest number you can find.

The complete IP rating chart: all standard ratings at a glance

The following chart covers the full range of IP ratings found on Australian industrial, commercial, and electrical products. Each row represents the combination of first digit (solid) and second digit (liquid).

IP44, IP54, IP55 and IP65: the everyday industrial ratings explained

These four ratings cover the majority of Australian industrial and commercial equipment. Each one has a distinct application window, and choosing the wrong one is one of the most common causes of premature equipment failure in the field.

IP44 — general light industrial

IP44 protects against objects greater than 1 mm (the first digit, equivalent to thin wire) and against splashing water from any direction (the second digit). This is the minimum practical rating for workshop and manufacturing environments where water splashes, light cleaning spray, or condensation may contact the housing. Indoor fan motors, light-duty conveyors, and indoor control panels in clean areas commonly carry IP44.

IP44 is not appropriate where there is significant airborne dust, where outdoor rain exposure is possible, or where cleaning involves any form of directed water jet. The 1 mm first digit also allows small insects and fine swarf to enter, which can cause electrical shorts in motors over time.

IP54 — dusty indoor environments

IP54 upgrades the solid protection from 1 mm openings (digit 4) to dust-protected status (digit 5), while keeping the splash-proof liquid rating. The IP5x dust test runs for 8 hours under a 2 kPa vacuum — it permits some dust ingress but prevents any accumulation that would impair operation or safety.

IP54 is the standard specification for motors and enclosures in dusty indoor environments: timber mills, grain handling, light aggregate processing, and recycling plants. It is suitable where the equipment is wiped down or hosed with a light spray but not subjected to sustained directional jet cleaning. If your site uses a pressure washer or high-flow garden hose for equipment cleaning, step to IP55 or IP65.

IP55 — standard outdoor motors

IP55 is the most widely specified IP rating for general-purpose outdoor electric motors in Australian industry. The 5 liquid digit means the enclosure withstands water projected by a 6.3 mm nozzle at 12.5 L/min and 30 kPa from 2.5–3 m in any direction. This covers normal rainfall intensity, moderate cleaning spray, and typical industrial hosing.

IP55 is appropriate for motors, pumps, and drives in outdoor installations that receive standard maintenance cleaning. It falls short of the powerful jet test (digit 6: 100 L/min, 100 kPa, 12.5 mm nozzle). If your maintenance crew uses a high-flow pressure washer on equipment, IP55 is under-specified — the jet volume and pressure exceed the test conditions. Specify IP65 (dust-tight equivalent) or IP56 (dust-protected with powerful jet resistance) in those scenarios.

IP65 — dust-tight with jet resistance

IP65 combines complete dust exclusion (first digit 6, vacuum-tested) with the standard water jet test (second digit 5: 6.3 mm nozzle, 12.5 L/min, 30 kPa). This is the standard minimum for outdoor LED luminaires, industrial sensors, outdoor switchboards, and any electrical enclosure in an exposed location that may receive hosing.

IP65 is specified for motor control centres (MCCs) in outdoor locations, cable entry glands on outdoor equipment, and junction boxes on vehicles and construction plant. It handles rain and standard maintenance hosing without issue. For high-flow pressure washers or CIP scenarios, step up to IP66.

IP66, IP67 and IP68: high-protection ratings compared

These three ratings occupy the high end of the IEC 60529 liquid scale. Each tests a fundamentally different failure mode, and none of them implies the others.

IP66 — powerful water jet protection

IP66 is tested with a 12.5 mm nozzle delivering 100 L/min at 100 kPa from 2.5–3 m in any direction for a minimum of 3 minutes. This is the high-pressure industrial hose scenario — the kind of cleaning performed in food processing plants, abattoirs, poultry factories, dairy facilities, and mining wash-down bays. If your maintenance regime involves directing a high-flow hose at electrical equipment, IP66 is the minimum correct specification.

In food manufacturing, equipment in open wash zones is typically hosed down daily, sometimes multiple times per day. The 100 L/min test flow is not extreme relative to actual practice in industrial cleaning — it's a realistic simulation of a rigorous hose-down. IP55 and even IP65 are under-specified for this environment.

IP66 is also appropriate for outdoor electrical equipment in locations subject to flooding by high-flow stormwater, where the dynamic energy of water flow creates pressures beyond simple immersion.

IP67 — temporary immersion

IP67 is tested by immersing the enclosure at 1 m depth for 30 minutes, with the lowest point of the enclosure at least 1 m below the water surface. This creates approximately 12.5 kPa of pressure at the top of the enclosure. No water should ingress to a harmful degree.

IP67 is appropriate for equipment that may be temporarily submerged: portable test instruments, handheld industrial tools, sensors installed at ground level in flood-risk areas, connectors on vehicles that wade through water, and underground junction boxes in high water-table areas. It provides genuine submersion resistance — but only at 1 m depth and only for short durations.

IP67 is not a substitute for IP66 in washdown environments. The static pressure of immersion (12.5 kPa) is far lower than the dynamic impact pressure of a 100 L/min jet. An enclosure gasket optimised for static immersion resistance may allow jet ingress because the jet creates localised pressure spikes well above 12.5 kPa. Always specify IP66 for washdown; IP67 for immersion.

IP68 — continuous immersion

IP68 means the enclosure can withstand continuous immersion under conditions agreed between the manufacturer and user. The depth and duration exceed the IP67 test, and manufacturers specify these on their datasheets — common specifications are 2 m for 1 hour, 3 m continuous, or similar. IP68 is used for submersible pump motors, permanently installed underwater sensors, marine connectors, underwater lighting, and buried electrical conduit systems in high-risk locations.

IP69K: high-pressure, high-temperature washdown explained

IP69K is the most demanding ingress protection designation commonly seen on Australian industrial equipment — and it comes from a different standard than the rest of the IP code. The "9K" designation does not exist within IEC 60529 / AS/NZS 60529. It originates from ISO 20653:2013 (protection of electrical equipment on road vehicles against ingress of foreign matter) and its predecessor DIN 40050-9. The K suffix distinguishes it from any hypothetical IEC digit 9, which doesn't exist.

The IP69K test conditions are significantly more aggressive than any IEC 60529 liquid test:

The 80°C water at 80–100 bar from 10–15 cm is specifically designed to simulate clean-in-place (CIP) and sterilise-in-place (SIP) sanitisation cycles. In food, dairy, beverage, and pharmaceutical manufacturing, electrical equipment in the production zone may be exposed to daily or multiple-daily cycles of hot caustic water at high pressure. Any seal that fails under these conditions — even briefly — creates an ingress pathway that can cause corrosion, short circuits, and contamination events.

IP69K is found on:

• Motors and variable speed drives in food processing, dairy, meat, and beverage plants
• Stainless steel sensors, cameras, and junction boxes in CIP wash zones
• Connectors and conduit fittings in chemical processing
• Equipment in hospital sterile services departments and pharmaceutical clean rooms
• Mining equipment in areas subject to hot pressure mud removal

Products rated IP69K almost always also carry IP67 or IP68, because the IP69K test does not cover submersion, and submersion tests do not cover high-pressure jets. A typical datasheet for a food-grade motor might show "IP66/IP67/IP69K" — three separate test passes, three different failure modes excluded.

When specifying for Australian food manufacturing governed by FSANZ Food Safety Standards and HACCP, the minimum specification for CIP or daily high-pressure washdown zones is typically IP66/IP69K, with stainless steel (316 grade) or food-grade polyester housings and EPDM or silicone seals. The IP rating alone does not ensure hygiene compliance — material selection and surface finish (Ra ≤ 0.8 μm for product contact surfaces, Ra ≤ 1.6 μm for indirect contact) are parallel requirements.

IP ratings for electric motors: what Australian industry actually uses

Electric motors are the most common class of equipment where IP ratings are formally specified in Australian industry. The IP rating of a motor enclosure is governed by both IEC 60529 and the motor-specific standard IEC 60034-5, which applies the same IP code but adapts test conditions to reflect motor geometry and operating modes (fan cooling airflow, condensation drain holes, etc.).

The practical effect: a motor described as IP55 under IEC 60034-5 may have been tested under slightly different conditions than a general enclosure rated IP55 under IEC 60529, though both must meet the same ingress performance criteria. For most specification purposes, the IP code on a motor datasheet can be used directly — just confirm whether IEC 60034-5 or IEC 60529 is cited.

A common and costly field mistake: selecting IP55 for motors in food processing facilities based on the reasoning that "it gets hosed down occasionally." In a properly managed food facility, motors in the open wash zone are hosed down with significant pressure daily — sometimes multiple times per shift. IP55 is tested at 12.5 L/min; a standard industrial wash gun typically delivers 20–40 L/min or more at elevated pressure. Specify IP66 as the minimum for any motor in a washdown zone. The cost difference between an IP55 and an IP66 motor is a fraction of one unplanned replacement and the associated downtime.

For complete motor selection guidance including frame sizes (IEC 56 to 315), efficiency classes (IE2, IE3, IE4), mounting configurations (B3, B35, B5), and Australian voltage standards, see our Industrial Electric Motor Guide. Browse the AIMS electric motors range.

IP ratings for hoists, lifting equipment and outdoor tools

Lifting equipment — electric chain hoists, wire rope hoists, hoist trolleys, and jib crane drives — operates in some of the most demanding environments in Australian industry. A steel fabrication shop, an outdoor port facility, a mining maintenance bay, or an abattoir each presents a different IP challenge. The IP rating of the hoist motor is only part of the picture: pendant controls, limit switches, and brake assemblies all have their own IP specifications, and a system is only as protected as its weakest-rated component.

The pendant control is frequently overlooked. A hoist motor rated IP65 paired with an IP44 pendant control means the system's effective IP rating is IP44 at the point most likely to receive water ingress during operation — the unit held in the operator's hand while hosing is happening around them. In food processing installations, all components of the hoist system should meet IP66 minimum. In outdoor mining and marine applications, all components should meet IP65 minimum.

For guidance on hoist selection including rated capacity (0.25–10 tonne), duty classification (M1–M8 per AS 1418.1), suspension configurations, and single-phase versus three-phase supply, see our Electric Hoist Guide. Browse the AIMS hoists and lifting equipment range.

IP ratings for lighting: LED work lights, inspection lights and torches

Lighting is one of the product categories where IP ratings are most frequently relevant to the end user — and where poor specification most reliably leads to premature failure. Water ingress into a luminaire causes arc tracking, lamp connection corrosion, seal degradation, and in the worst case, electric shock or fire. In Australian workplaces, lighting IP compliance is also a WHS obligation under AS/NZS 3000:2018 for bathroom and wet area zones, and a practical necessity for any fitting exposed to weather or cleaning.

For general-purpose LED work lights used on Australian construction and maintenance sites, IP65 is the standard specification. IP65 handles rain, spray, and light maintenance hosing reliably. For inspection lights used in drains, engine bays, cable pits, and wet confined spaces, IP67 is the safer choice — the risk of brief immersion in pooled water or heavy spray is real in these environments.

A practical note on pressure washing near work lights: IP65 is rated for a 6.3 mm nozzle at 12.5 L/min and 30 kPa. A standard pressure washer at typical settings delivers considerably more pressure. If a work light is likely to be in the direct path of pressure washer spray during site cleanups, IP66 is the appropriate specification.

The AIMS lighting range — including Coast and Macnaught LED work lights, inspection lights, Hansa headlamps, and Alemlube workshop torches — covers a broad selection of IP-rated options for workshop, outdoor, and inspection applications.

For eye protection when working in bright, UV, or hazardous light environments, see our Safety Glasses Guide covering lens categories under AS/NZS 1337.1.

Australian bathroom zone requirements: AS/NZS 3000:2018

The AS/NZS 3000:2018 Wiring Rules mandate specific minimum IP ratings for electrical equipment installed in or around bathroom areas. These are not guidelines — they are compliance requirements for all licensed electrical installation work in Australia and New Zealand. Non-compliant installations expose the installer and the property owner to liability under state and territory electrical safety legislation.

The Wiring Rules define the area around a bathtub, shower, or wet area using three concentric zones, each with a different mandatory minimum IP rating:

Practical implications for electrical work:

• Any luminaire inside a shower recess or bath — whether recessed, surface-mounted, or pendant — must be rated IPX7 minimum
• Exhaust fans, heat lamps, light fittings, heated towel rail thermostats, and any other electrical equipment within Zone 1 or Zone 2 height and radius must be IPX4 minimum
• Shaver outlets are prohibited in Zone 0 and Zone 1. In Zone 2, they require a specifically designed shaver supply unit with transformer isolation
• General power outlets are prohibited in all three zones

The X in IPX4 and IPX7 means solid particle protection is not assessed for that fitting. For most bathroom applications, this is acceptable — the hazard is water, not dust. However, for bathroom exhaust fans in renovation contexts where construction dust may be present, or for bathrooms in commercial buildings with dusty adjacent spaces, a fitting with a declared solid particle rating (e.g. IP54 or IP65) provides additional assurance.

Commercial bathroom specifications — hospitals, aged care facilities, hotel en suites, sports facilities — typically specify IP65 throughout the wet zone rather than the IPX4 minimum. This provides margin against high-flow shower heads, frequent cleaning with pressure spray, and the heavy use that exceeds residential parameters.

IK ratings: impact protection — what IP ratings don't cover

IP and IK ratings are completely separate classification systems. Confusing them — or assuming that a high IP rating implies impact resistance — is a specification error with real consequences in environments where vandalism, forklift proximity, falling tools, or vibrating machinery are present.

The IK rating is defined by IEC 62262:2002 and indicates the degree of protection an enclosure provides against mechanical impact. The scale runs from IK00 (no protection claimed) to IK10 (protection against a 20-joule impact). Test impacts are delivered by a pendulum or drop-weight mechanism onto the most vulnerable point of the enclosure.

The independence of IP and IK ratings has practical implications:

• A polycarbonate junction box can be IP67 and IK07 — it resists submersion but cracks under a significant blow. In a busy workshop with passing forklifts, IK07 may be insufficient regardless of the IP rating.
• A steel enclosure can be IK10 and IP44 — it withstands heavy impacts but is not protected against sustained dust or water ingress. Adding a gasket set upgrades the IP rating without affecting the IK performance.
• For mining and quarrying applications, specifying both IP66 (washdown) and IK08 (5 J impact resistance) is standard minimum practice for enclosures in active work areas.

When reading product datasheets, look for combined specifications such as "IP66 IK08" — this confirms both standards have been tested and met. Single-specification products that only cite IP leave the impact resistance unknown.

NEMA ratings: the North American alternative

Equipment manufactured for the North American market carries NEMA enclosure ratings rather than IP ratings. NEMA (National Electrical Manufacturers Association) uses a type number system with different test methods and performance criteria. The two systems are not interchangeable, though approximate equivalences are commonly used in industry as a reference.

Key differences to understand when evaluating imported US equipment:

• NEMA ratings include requirements that IP ratings do not — corrosion resistance (NEMA 4X), oil resistance (NEMA 13), and ice formation (NEMA 3/3S). A NEMA 4X enclosure carries corrosion resistance as a rated property; an IP66 enclosure may or may not be corrosion resistant depending on material selection.
• NEMA test conditions for "watertight" (NEMA 4) do not precisely replicate the IP66 100 L/min test — the water flow rates and pressures differ. Approximate equivalences are used for cross-referencing, not for direct compliance substitution.
• In Australia, IP ratings are the compliance standard. If you're installing US-manufactured equipment and need to confirm AS/NZS compliance, you need an IP test certificate or datasheet IP rating, not a NEMA type. Most US manufacturers of equipment sold into Australia also provide IP ratings for this reason.

How to choose the right IP rating for your application

Correct IP specification is a straightforward process once you've identified the actual environmental hazards — not the assumed ones. Overshooting wastes money on unnecessary sealing technology. Undershooting leads to premature failure, unplanned maintenance, and potentially unsafe conditions. Here is a structured decision guide:

Four additional principles for reliable IP specification:

1. Rate the weakest point in the system. A motor rated IP66 paired with an IP44 junction box or IP44 pendant control creates a system rated IP44 at those components. In washdown environments, every electrical component in the wet zone must meet the same IP specification as the highest-rated element.
2. Account for your actual maintenance regime, not the theoretical one. If the maintenance standard operating procedure specifies a pressure washer, that is an IP66 scenario regardless of what IP55 says about "normal" hosing. Design to what actually happens on site.
3. Separate the IP rating from the material. Two products with identical IP ratings can have vastly different service life in corrosive, UV, or chemical environments depending on housing material, gasket compound, and surface treatment. For coastal, chemical, or food applications, specify material and seal type alongside the IP code.
4. Request the test certificate for critical applications. Some products carry self-declared IP ratings; others hold third-party certification from a NATA-accredited or internationally recognised test laboratory. For safety-critical applications — lifting, food contact, electrical infrastructure — third-party certification provides a level of assurance that self-declaration does not.

For application-specific guidance on motors, hoists, lighting, and enclosures, contact the AIMS team — we stock a broad range across the IP spectrum and can help you specify correctly for your environment. Browse electric motors, hoists and lifting equipment, and workshop and inspection lighting at AIMS.