The IP code (Ingress Protection code) is defined by the International Electrotechnical Commission (IEC) under standard IEC 60529, which classifies the degree of protection provided by mechanical casings and electrical enclosures against intrusion, dust, accidental contact, and water [4]. This standard aims to provide users with more detailed information than vague marketing terms such as "waterproof."
An IP rating consists of two digits: the first digit (0-6) indicates protection against solid particles like dust, while the second digit (0-9) indicates protection against liquid ingress. For LED strips, the most common ratings are IP20 (indoor dry), IP65 (water resistant), IP67 (temporary submersion), and IP68 (continuous submersion) [5].
IP Rating Breakdown for LED Strips
| IP Rating | Dust Protection | Water Protection | Test Conditions | Typical Application |
|---|---|---|---|---|
| IP20 | No protection | No protection | None | Indoor dry areas only (ceilings, cabinets) |
| IP54 | Dust protected (limited) | Water splashes from any direction | Oscillating fixture 10 min | Indoor humid areas (kitchens, bathrooms) |
| IP65 | Dust-tight (complete) | Water jets from any direction | 6.3mm nozzle, 30 kPa, 3 min | Outdoor protected areas (under eaves, patios) |
| IP67 | Dust-tight (complete) | Temporary immersion up to 1m | 30 minutes at 1m depth | Outdoor exposed areas, temporary wet conditions |
| IP68 | Dust-tight (complete) | Continuous submersion | Manufacturer specified (typically 1-3m) | Underwater applications, permanent outdoor |
First Digit - Solid Particle Protection: IP6X means dust-tight with complete protection against contact. The test involves applying a vacuum for up to 8 hours based on airflow [4]. IP5X means dust protected—ingress is not entirely prevented but must not enter in sufficient quantity to interfere with safe operation.
Second Digit - Liquid Ingress Protection: The ratings for water ingress are not cumulative beyond IPX6. A device compliant with IPX7 (covering water immersion) is not necessarily compliant with IPX5 or IPX6 (covering exposure to water jets). A device that meets both tests is indicated by listing both tests separated by a slash, e.g., IPX5/IPX7 [4]. Standard IP testing is performed using fresh water; protection against other fluids such as salt water, oils, or solvents is not guaranteed by the rating.

