IP防护等级全面指南

The Ingress Protection (IP) rating, defined by IEC 60529 — the authoritative standard (Degrees of Protection Provided by Enclosures), is the international standard for classifying the degree of protection provided by an electrical enclosure against solid foreign objects (dust, tools, fingers) and liquids (water, moisture). For lighting fixtures, the IP rating is one of the most critical specification parameters for determining suitability in different environments — from dust-free indoor offices (IP20) to fully submerged underwater fountain lights (IP68). This article provides a complete technical reference for IP ratings as applied to luminaires, including the full IP code structure, zone-specific requirements for bathrooms per IEC 60364-7-701 (and GB 50034-2013), outdoor selection guidelines, and compliance testing specifications per IEC 60598-1.

\n\nIP Code Structure: The Two-Digit System\n\nThe IP code consists of the letters "IP" followed by two digits (and optionally supplementary letters). The first digit (0–6, or X) indicates the level of protection against solid objects and dust ingress. The second digit (0–9, or X) indicates protection against moisture and water ingress.\n\nFirst Digit — Solid Protection\nProtection Against\nTest Detail\n\n0\nNo protection\n—\n\n1\nSolid objects > 50 mm (e.g., back of hand)\n50 mm sphere probe, no full penetration\n\n2\nSolid objects > 12.5 mm (e.g., fingers)\n12.5 mm jointed finger probe, 80 mm length\n\n3\nSolid objects > 2.5 mm (e.g., tools, thick wires)\n2.5 mm steel rod, no full penetration\n\n4\nSolid objects > 1.0 mm (e.g., small wires, screws)\n1.0 mm steel wire, no full penetration\n\n5\nDust-protected — dust ingress not entirely prevented but does not interfere with operation\n2–8 hours in dust chamber with talcum powder, underpressure maintained\n\n6\nDust-tight — no dust ingress\nSame as IP5X but with sustained vacuum inside enclosure\n\nSecond Digit — Liquid Protection\nProtection Against\nTest Detail\n\n0\nNo protection\n—\n\n1\nVertically falling water drops (condensation)\n10 min drip test at 1 mm/min\n\n2\nDripping water when tilted up to 15°\nSame as IPX1, enclosure tilted 15°\n\n3\nSpraying water at up to 60° from vertical\nSwinging spray nozzle, 10 L/min, 5 min\n\n4\nSplashing water from any direction\nSwinging spray nozzle, 10 L/min, 5 min (wider arc)\n\n5\nWater jets (6.3 mm nozzle) from any direction\n12.5 L/min, 30 kPa, 3 m distance, 15 min\n\n6\nPowerful water jets (12.5 mm nozzle) from any direction\n100 L/min, 100 kPa, 3 m distance, 3 min\n\n7\nTemporary immersion in water (0.15–1.0 m depth, 30 min)\nImmersion at specified depth per manufacturer or standard\n\n8\nContinuous immersion in water beyond 1 m depth (manufacturer-specified)\nAs specified, typically 1–50 m depth\n\n9K\nHigh-pressure, high-temperature water jets (80 °C, 80–100 bar)\nHot water spray cleaning (originally DIN 40050-9)\n\nThe supplementary letters K (IP69K, from DIN 40050-9) and additional characters such as F (oil-resistant) or H (high-voltage) may also appear, though these are less common in general architectural lighting.\n\nIP Rating Selection by Application Environment\n\nSelecting the correct IP rating for a lighting fixture depends on the specific environmental exposure. The following table provides a comprehensive mapping of IP ratings to common lighting applications, referenced to IEC 60598-1 (Luminaires — General Requirements and Tests) and GB 7000.1-2015 (the Chinese national adoption of IEC 60598).\n\nIP Rating\nTypical Application\nEnvironment Description\nStandard Reference\n\nIP20\nGeneral indoor: offices, living rooms, hotel rooms, retail interiors\nDry, dust-free indoor spaces\nGB 7000.1 Clause 4.3\n\nIP21–IP22\nHeated indoor spaces with condensation risk\nHeated warehouses, boiler rooms (drip protection)\nIEC 60598-2-1\n\nIP23\nCovered outdoor (soffit, porch, under eave)\nProtected from direct rain but exposed to wind-blown spray\nIEC 60598-2-5\n\nIP44\nBathroom zone 2, covered outdoor, kitchen splash zones\nProtected from splashing water from all directions\nIEC 60364-7-701, GB 50034-2013\n\nIP54\nIndustrial kitchens, covered outdoor walkways, canopies\nLimited dust ingress + water spray resistance\nIEC 60598-2-22\n\nIP65\nUncovered outdoor: wall packs, floodlights, street lighting\nFull dust-tight + low-pressure water jet resistance\nIEC 60598-2-3, EN 13201-2\n\nIP66\nMarine, coastal, heavy-rain outdoor areas, construction sites\nFull dust-tight + powerful water jet resistance\nIEC 60598-2-8\n\nIP67\nTemporary submersion: garden stake lights, landscape wells, pool lights (non-continuous)\nFull dust-tight + temporary immersion (1 m, 30 min)\nIEC 60598-2-18\n\nIP68\nContinuous underwater: fountain lights, swimming pool lights, marine navigation\nFull dust-tight + continuous immersion (depth specified)\nIEC 60598-2-18\n\nIP69K\nFood processing, car washes, pharmaceutical clean rooms\nHigh-pressure hot water sterilization\nDIN 40050-9, ISO 20653\n\nBathroom Zone IP Requirements (IEC 60364-7-701)\n\nBathrooms are divided into four distinct zones (0–3) with increasing IP requirements as proximity to water sources increases. These requirements are harmonized across IEC 60364-7-701, GB 50034-2013, and BS 7671 (UK Wiring Regulations).\n\nZone 0 (Inside the bath or shower tray): Any luminaire installed within the bath or shower basin must be rated IP67 minimum, as it may be temporarily submerged. Extra-low voltage (SELV, ≤ 12 V AC or ≤ 30 V DC) is mandatory. Supply via safety isolating transformer (IEC 61558-2-6).\n\nZone 1 (Above the bath, up to 2.25 m height directly above the bath rim): IPX4 minimum (IP44 is standard). Luminaires must be splash-proof. For shower areas without a tray, Zone 1 extends to 2.25 m above the floor within the shower area. SELV recommended.\n\nZone 2 (0.6 m outward from the bath rim or shower basin, up to 2.25 m height): IPX4 minimum (IP44 standard). This zone includes the area around wash basins within 60 cm of tap openings.\n\nZone 3 (Outside Zone 2, the rest of the bathroom): IP20 minimum applies. However, many national codes (e.g., GB 50034-2013 §4.4.1) recommend IP44 for the entire bathroom to accommodate splashing from normal use.\n\nIt is important to note that recessed downlights in bathroom ceilings must also be rated for the appropriate zone. An IP20 downlight installed directly above a bathtub (Zone 1) is a code violation. For general bathroom ceiling installations outside the zones above the bath, IP44 downlights are the industry minimum specification for bathroom retrofit projects in China, Europe, and North America.\n\nOutdoor Lighting: IP Rating Selection Guide\n\nOutdoor lighting faces a wider range of environmental conditions. The table below provides minimum IP requirements for common outdoor lighting applications based on IEC 60598-2 series and EN 13201-2.\n\nApplication\nMinimum IP Rating\nAdditional Requirements\n\nUnder-eave/soffit lighting (protected from direct rain)\nIP44\nUV-resistant housing required (polycarbonate or powder-coated aluminum)\n\nWall-pack and facade lighting (exterior walls, direct rain exposure)\nIP65\nCorrosion-resistant hardware (stainless steel 304 or 316)\n\nGarden path lights (ground-level, stake-mounted)\nIP65–IP67\nImpact resistance IK08 minimum per IEC 62262\n\nStreet lighting (pole-mounted, unshielded)\nIP65–IP66\nWind load resistance + drainage provisions per IEC 60598-2-3\n\nUnderground recessed uplights (in-ground, walkover)\nIP67–IP68\nDrainage channels, load rating ≥ 5 kN per IEC 60598-2-13\n\nSwimming pool underwater lights\nIP68\nSELV (≤ 12 V AC), silicone-filled cable glands, depth rating specified\n\nFountain and water feature lights\nIP68\nContinuous immersion with 3 m cable length minimum\n\nCar wash / truck wash bay lighting\nIP69K\n80 °C water resistance, chemical resistance\n\nIP Testing Standards and Certification\n\nIP testing for luminaires follows the procedures defined in IEC 60529 and IEC 60598-1. Key testing conditions include:\n\nDust test (IP5X and IP6X): The luminaire is placed in a dust chamber with talcum powder circulating for 2–8 hours. For IP6X, a vacuum of 20 mbar is maintained inside the enclosure during the test to create negative pressure differential. No dust ingress is permitted for IP6X; limited ingress that does not affect operation is permitted for IP5X.\n\nWater jet tests (IPX5 and IPX6): The luminaire is sprayed from all practical directions using a standardized nozzle at specified flow rates and pressures. For IPX5: 12.5 L/min at 30 kPa, 3 m distance, 15 minutes. For IPX6: 100 L/min at 100 kPa, 3 m distance, 3 minutes per square meter of surface.\n\nImmersion tests (IPX7 and IPX8): For IPX7, the luminaire is immersed in water at 1.0 m depth (or 0.15 m below surface for large luminaires) for 30 minutes. For IPX8, the depth and duration are specified by the manufacturer; common ratings include 3 m/24 h or 50 m/continuous.\n\nTemperature conditioning: Luminaires must be conditioned at the test temperature (typically 25 ± 15 °C) for 2 hours prior to testing.\n\nCertification bodies such as TÜV Rheinland, UL, DEKRA, and the China Quality Certification Center (CQC) provide third-party IP testing services. GB 7000.1-2015 (equivalent to IEC 60598-1:2014) is the mandatory Chinese national standard for luminaire safety, including IP-related enclosure requirements.\n\nCommon Mistakes in IP Rating Specification\n\nConfusing IP44 with IP65 for outdoor use. IP44 offers splash protection but not rain jet protection. An IP44 wall pack in an area exposed to wind-driven rain may fail within months. IP65 is the minimum for unprotected outdoor wall-mounted fixtures.\n\nAssuming IP67 is always higher than IP66. IP67 and IP66 test for different water challenges: IP66 tests powerful jets (100 L/min, 100 kPa), while IP67 tests static immersion (1 m, 30 min). A fixture can pass IP67 but fail IP66 if its

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Sources & Standards

References: IEC 60529 (Ingress Protection), IEC 60364-7-701 (Bathroom), UL 1598

Technical specifications verified against manufacturer datasheets and industry standards. Compare LED products side by side at lighting.compare2best.com.