Interactive guide to IP (Ingress Protection) ratings for electrical equipment in the UK. Covers all codes from IP00 to IP69K with bathroom zones, outdoor requirements, and BS 7671 compliance.
| Location/Zone | Minimum IP Rating | Examples |
|---|---|---|
| Indoor Dry | IP20 | Living rooms, bedrooms, offices |
| Kitchen | IP44 | Near sinks, above cookers |
| Bathroom Zone 0 | IP67 | Inside bath/shower |
| Bathroom Zone 1 | IP65 | Above bath/shower to 2.25m |
| Bathroom Zone 2 | IP44 | Within 0.6m of bath/shower |
| Outdoor Covered | IP44 | Porches, covered patios |
| Outdoor Exposed | IP65 | Gardens, driveways, car parks |
| Underground | IP68 | Buried cables, submersible pumps |
An IP rating (Ingress Protection rating) is a two-digit code defined by international standard IEC 60529 (published in the UK as BS EN 60529) that classifies how well an electrical enclosure protects against solid objects and liquids. The first digit (0–6) rates solid particle protection, and the second digit (0–9K) rates liquid ingress protection.
Every piece of electrical equipment installed in the UK must have an appropriate IP rating for its location. The 18th Edition Wiring Regulations (BS 7671:2018+A2:2022) specify minimum IP ratings for bathrooms, swimming pools, outdoor installations, and other special locations. Choosing the wrong IP rating can lead to water ingress, equipment failure, and serious electrical safety hazards.
The rating is always written as "IP" followed by two digits — for example, IP65 means dust-tight (6) and protected against water jets (5). An "X" in place of either digit means the product has not been tested for that criterion (e.g., IPX4 is tested for splash resistance only, not solids).
The tables below show every possible first and second digit in the IEC 60529 IP code system, along with a reference chart of the most common IP rating combinations used in UK electrical installations.
| Digit | Object Size | Protection Against | Practical Example |
|---|---|---|---|
| 0 | No protection | No barrier against contact or ingress | Open-frame equipment, bench test rigs |
| 1 | >50 mm | Large surfaces of the body (back of hand) | Industrial motor housings |
| 2 | >12.5 mm | Fingers or similar objects | Consumer units, indoor switchgear (IP2X) |
| 3 | >2.5 mm | Tools, thick wires, small fasteners | Distribution boards, cable cabinets |
| 4 | >1 mm | Wires, slender screws, large insects | Laboratory equipment, internal control panels |
| 5 | Dust-protected | Limited dust ingress (must not affect operation) | Workshops, semi-outdoor enclosures |
| 6 | Dust-tight | Complete protection — no dust ingress | Outdoor lighting, IP65+ enclosures |
| Digit | Protection | Test Condition | Duration |
|---|---|---|---|
| 0 | No protection | No test | — |
| 1 | Vertical dripping water | 1 mm/min rainfall, enclosure on turntable at 1 rpm | 10 min |
| 2 | Dripping water (15° tilt) | 3 mm/min rainfall, tested in 4 tilted positions | 10 min |
| 3 | Spraying water | Water spray up to 60° from vertical, oscillating tube | 5–10 min |
| 4 | Splashing water | Splashes from all directions, 180° oscillating tube | 5–10 min |
| 5 | Low-pressure water jets | 6.3 mm nozzle, 12.5 L/min at 30 kPa, 3 m distance | 3 min |
| 6 | Powerful water jets | 12.5 mm nozzle, 100 L/min at 100 kPa, 3 m distance | 3 min |
| 7 | Temporary immersion (1 m) | Submerged to 1 m depth (or top 150 mm below surface) | 30 min |
| 8 | Continuous immersion | Depth and time specified by manufacturer | Continuous |
| 9K | High-pressure/temperature jet | 80°C water at 80–100 bar, 10–15 cm distance, 4 angles | 2 min |
| IP Code | Solids | Liquids | Typical UK Applications |
|---|---|---|---|
| IP20 | Fingers | None | Indoor consumer units, switchgear, dry rooms |
| IP40 | 1 mm wires | None | Lab equipment, indoor control panels |
| IP44 | 1 mm wires | Splash | Bathroom zones 2+, kitchens near sinks, covered porches |
| IP54 | Dust-protected | Splash | Workshops, garages, EV chargers (sheltered) |
| IP55 | Dust-protected | Jets | EV wallboxes, outdoor covered areas, commercial kitchens |
| IP65 | Dust-tight | Jets | Outdoor lighting, exposed sockets, car parks, bathroom zone 1 |
| IP66 | Dust-tight | Powerful jets | Outdoor sockets (BS 1363), marine environments, wash-down areas |
| IP67 | Dust-tight | Immersion 1 m | Bathroom zone 0, ground-recessed lights, flood-prone areas |
| IP68 | Dust-tight | Continuous immersion | Pond pumps, underwater lights, buried junction boxes, solar optimisers |
| IP69K | Dust-tight | Steam jet | Commercial kitchens, food processing, pharmaceutical clean rooms |
The IP code is defined by IEC 60529 (International Electrotechnical Commission) and published in the UK as BS EN 60529:1992+A2:2013. It provides a standardised method for classifying the degree of protection provided by enclosures for electrical equipment.
Example: IP65CH = dust-tight, water jets, tool-proof access, high-voltage apparatus
When a digit is replaced with X, it means the enclosure was not tested for that criterion. For example, IPX4 is rated for splash resistance but has not been classified for solid particle ingress. IP6X is dust-tight but not tested for liquid protection. This is not the same as zero protection — it simply means no test was conducted.
These optional letters indicate protection of persons against access to hazardous parts inside the enclosure. They are used when the access protection is more restrictive than the solid particle protection, or when the first digit is replaced by X.
| Letter | Protection Against | Test Probe |
|---|---|---|
| A | Back of hand | 50 mm sphere, 50 N force |
| B | Finger | 12 mm jointed test finger, 80 mm long, 10 N force |
| C | Tool | 2.5 mm rod, 100 mm long, 3 N force |
| D | Wire | 1 mm wire, 100 mm long, 1 N force |
BS 7671 example: Regulation 416.2.1 requires that live parts must be inside enclosures providing at least IP2X or IPXXB. Regulation 416.2.2 requires horizontal top surfaces of accessible enclosures to meet IP4X or IPXXD to prevent small objects falling onto live parts.
| Letter | Meaning | When Used |
|---|---|---|
| H | High-voltage apparatus | Equipment with critical electrical clearance distances |
| M | Moving during water test | Rotating motors and fans tested while running |
| S | Stationary during water test | Equipment tested while stationary (not energised) |
| W | Weather conditions | Additional tests for UV, humidity, or corrosion resistance |
Water protection levels above IPX6 are not cumulative. An enclosure rated IPX7 (temporary immersion) may not pass the IPX5 (water jet) or IPX6 (powerful jet) tests. Jets exert high-velocity kinetic force on specific seal points, while immersion exerts uniform static pressure. If you need protection against both jets and immersion, look for a dual-rated product such as IP66/IP67, which has been independently tested for both conditions.
These four ratings are the most commonly compared when specifying outdoor and industrial electrical equipment in the UK. All four are completely dust-tight (first digit 6), but they differ significantly in liquid protection.
| Feature | IP65 | IP67 | IP68 | IP69K |
|---|---|---|---|---|
| Dust protection | Dust-tight | Dust-tight | Dust-tight | Dust-tight |
| Water protection | Low-pressure jets | Immersion to 1 m | Continuous immersion | 80°C steam at 100 bar |
| Test method | 6.3 mm nozzle, 3 m | Submerged 30 min | Manufacturer spec | 10–15 cm, 4 angles |
| Best for | Wall-mounted outdoor | Ground-level / flood risk | Submersible / buried | Steam cleaning areas |
| UK examples | Outdoor lights, CCTV | Recessed uplights, Zone 0 | Pond pumps, solar optimisers | Commercial kitchens |
| Relative cost | £ | ££ | £££ | ££££ |
IP65 is the standard choice for most exposed outdoor electrical installations in the UK — garden lighting, security cameras, outdoor sockets. It handles rain, hose spray, and wind-driven water with no issues.
IP67 adds immersion protection, making it suitable for ground-level installations where standing water or flooding may occur. It is the minimum for bathroom Zone 0 (inside bath/shower).
IP68 is for continuously submerged equipment — pond pumps, underwater lighting, and solar panel DC optimisers that sit beneath panels where water can pool. The exact depth and duration are set by each manufacturer, so always check the specific IP68 claim.
IP69K is a specialist rating for environments requiring high-pressure, high-temperature cleaning. Originally developed for road vehicles, it is now essential in UK commercial kitchens and food processing facilities.
BS 7671:2018+A2:2022 Section 701 divides bathrooms into zones based on proximity to water sources. Each zone has specific IP rating and voltage requirements. All bathroom circuits require 30 mA RCD protection per Regulation 701.411.3.3. Use our shower circuit calculator to design compliant bathroom circuits with the correct cable sizes and protection devices.
Beyond bathrooms, BS 7671 defines IP rating requirements for numerous special locations. Each section addresses specific environmental hazards and sets minimum enclosure protection levels.
| Zone | Location | Min IP | Voltage |
|---|---|---|---|
| 0 | Inside basin | IPX8 | SELV 12 V AC / 30 V DC max |
| 1 | 2 m from basin, 2.5 m high | IPX4 / IPX5 | SELV 25 V AC / 60 V DC max |
| 2 | 1.5 m beyond Zone 1 | IPX2 / IPX4 | 30 mA RCD required |
IPX5 required in zones where water jets are used for cleaning. IPX4 for outdoor pool Zone 2.
Saunas are divided into three vertical zones. All equipment requires minimum IPX4 (IPX5 if water jets used for cleaning). Zone 3 equipment (above 1.0 m) must withstand 125°C minimum; wiring must withstand 170°C. Socket outlets are strictly prohibited inside the sauna cabin. 30 mA RCD protection on all circuits.
Distribution boards must comply with BS EN 61439-4 at minimum IP44. Horizontal top surfaces of enclosures must meet IP4X or IPXXD (Reg 704.512.2). Portable equipment: minimum IP44, typically on 110 V reduced-voltage supply. EICR-style inspections recommended every 3 months on high-risk sites.
| Location | Min IP | Key Hazard |
|---|---|---|
| Milking parlours / dairies | IPX5 | Frequent water jet cleaning |
| Grain stores / feed areas | IP5X | Combustible dust concentration |
| General livestock sheds | IP44 | Moisture and mechanical impact |
Cattle are sensitive to stray voltages — equipotential bonding in milking parlours is critical.
Home wallboxes require minimum IP54 (IP55 typical, IP65 for fully exposed locations). Commercial charging pillars: IP65 recommended. Rapid DC chargers: IP65 or higher due to liquid cooling. For outdoor cable runs to EV chargers and outbuildings, use our SWA cable calculator to size steel wire armoured cables with the correct IP-rated glands. All EV installations require Type A RCD with 6 mA DC detection, or Type B RCD. In coastal areas, combine IP65+ with 316L stainless steel for salt spray resistance.
String inverters installed outdoors: typically IP65. DC optimisers and junction boxes beneath panels (where water pools): IP68. A local DC isolator must be provided near the inverter. Cable glands at inverter entry are a common failure point — always use IP-rated glands torqued correctly to prevent moisture wicking along cable strands.
Minimum IPX4 for splash protection, IPX5 for water jets, IPX6 for wave protection. Socket outlets: minimum IP44, placed at 1 m above highest water level. On floating pontoons, may reduce to 300 mm if IPX4 is maintained. Isolating transformers (BS EN 61558) used to prevent galvanic corrosion between vessel hulls and shore supply.
Wall-mounted accessories: IP55 minimum. Equipment requiring steam cleaning: IP69K — withstands 80°C water at 100 bar pressure. Light fixtures in extract hoods: steel-enclosed with tight-fitting glass. Food-safe motors and lighting use IP69K to prevent bacterial growth behind seals. Near sinks and hobs: minimum IP44.
General areas (Group 0): standard IP20 rules. Operating theatres and ICUs (Group 2): medical IT system with insulation monitoring. Wash-down areas and chemical-resistant zones: IP54 or higher. Decontamination areas may require IP55+. All Group 2 circuits use insulation monitoring devices (IMD) alerting staff when resistance drops below 50 kΩ.
Follow this five-step framework to select the correct IP rating for any UK electrical installation.
| Installation Location | Recommended IP |
|---|---|
| Dry indoor rooms (living room, bedroom, office) | IP20 |
| Kitchen (near sink or hob) | IP44 |
| Bathroom (Zone 2 and outside zones) | IP44 |
| Sheltered porch or covered patio | IP44 |
| Attached garage (dry) | IP44 |
| Dusty workshop (woodworking, metalwork) | IP54 – IP65 |
| Exposed outdoor (garden, driveway, car park) | IP65 |
| Ground-recessed or flood-prone areas | IP67 |
| Submerged (ponds, buried junction boxes) | IP68 |
| High-pressure steam cleaning environments | IP69K |
IP67 (immersion) is not automatically better than IP65 (jets) for all applications. Liquid protection above IPX6 is not cumulative — an IPX7-rated enclosure may fail the IPX5 water jet test. For outdoor wall-mounted equipment exposed to rain and hose spray, IP65 is often the correct choice, not IP67. Over-specifying also increases cost and can make maintenance harder due to more complex sealing.
Standard IP20 switches and sockets must never be installed within bathroom zones 0, 1, or 2 — even just outside the shower screen. Steam and condensation can travel well beyond the visual splash zone. Use IP44 minimum for any fitting inside a bathroom, regardless of zone. Ensure correct earthing and bonding conductor sizes are calculated for all bathroom circuits.
IP rates ingress protection (dust and water). IK rates mechanical impact resistance (IEC 62262). A sensor can be IP67 but only IK02 — waterproof yet fragile. For public or vandal-prone areas (car parks, schools, public toilets), always specify both IP and IK ratings.
IP ratings apply when the enclosure is new and properly sealed. UV exposure embrittles plastic housings. Gaskets harden and lose elasticity over time. Rubber O-rings can crack after years of temperature cycling. Always inspect seals during EICR testing and replace compressed or UV-damaged gaskets rather than reusing them.
The most common real-world IP failure. An IP66 enclosure fitted with an IP54 cable gland has an effective rating of IP54 at that entry point. Every cable entry, blanking plate, and gland must match or exceed the enclosure's rating. Over-tightening distorts gaskets; under-tightening leaves gaps. Use the manufacturer's specified torque.
IP65+ enclosures are effectively sealed boxes that trap heat. High-power LED drivers, inverters, and motor starters inside sealed enclosures can overheat without adequate thermal management. Use IP-rated breather vents, heat sinks, or thermally conductive enclosure materials for installations with significant heat generation.
IP ratings are determined by standardised laboratory tests defined in IEC 60529. Each digit is tested independently using specific apparatus and pass/fail criteria.
The enclosure is placed in a test chamber filled with talcum powder at a density of 2 kg per cubic metre. For IP5X (dust-protected), the test runs for up to 8 hours while air is circulated. Some dust may enter, but it must not interfere with the safe operation of the equipment.
For IP6X (dust-tight), a vacuum pump creates a continuous negative pressure of 2 kPa (20 mbar) inside the enclosure, drawing air equal to 80 times the enclosure volume through any gaps. This simulates the "breathing effect" caused by thermal cycling. After the test, no measurable dust may be found inside.
Tests IPX1 and IPX2 use a drip box — a tank with calibrated needles simulating rainfall. The enclosure is mounted on a turntable (IPX1) or tilted to four positions at 15° (IPX2).
Tests IPX3 and IPX4 use an oscillating tube — a semicircular arc with spray holes covering 60° (IPX3) or 180° (IPX4) around the enclosure.
Tests IPX5 and IPX6 use calibrated nozzles: a 6.3 mm nozzle at 12.5 L/min for IPX5, and a 12.5 mm nozzle at 100 L/min for IPX6. Both tested from 3 metres distance for 3 minutes.
IPX7 testing submerges the enclosure in a tank with the bottom at 1 m depth (or the top at 150 mm below the surface, whichever is deeper) for 30 minutes. IPX8 conditions are specified by the manufacturer — typically deeper than 1 m for continuous periods. Immersion tanks use pressure sensors to detect any seal breach.
The IP69K test (DIN 40050 Part 9 / ISO 20653) is the most demanding water protection test. The enclosure is subjected to high-pressure (80–100 bar), high-temperature (80°C) water jets from a nozzle at 10–15 cm distance. The jet is applied from four angles — 0°, 30°, 60°, and 90° — for approximately 30 seconds per angle. The combination of kinetic energy and thermal shock tests both the seal integrity and the material's resistance to heat deformation.
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