IP66
Last updated: Aug 9, 2026IP66 is dust-tight and resists powerful water jets (12.5 mm nozzle, 100 kPa). A robust outdoor rating for equipment exposed to heavy rain, storms, or directed high-pressure hosing (but not high-pressure washdown).
Solid 6
Dust-Tight
Liquid 6
Powerful Water Jets (12.5 mm nozzle)
What IP66 means
The IP code IP66 is part of the IEC 60529 standard for ingress protection. The first characteristic numeral, 6, indicates the level of protection against solid objects and access to hazardous parts. The second numeral, 6, indicates the level of protection against the ingress of water. Together, these digits describe exactly what an enclosure rated IP66 can withstand.
For solid protection, the digit 6 means the enclosure is dust-tight. Protected against access to hazardous parts with a wire. No ingress of dust whatsoever. The test method is dust chamber (talcum powder) for 8 hours (2 hours if equipment is in operation) with enclosure under reduced internal pressure; no dust ingress permitted.
For liquid protection, the digit 6 means the enclosure resists powerful water jets (12.5 mm nozzle). Protection against powerful water jets. Water projected in powerful jets by a 12.5 mm nozzle against the enclosure from any direction shall have no harmful effects. The test procedure is standard nozzle (12.5 mm diameter) at 100 kpa, 100 l/min; water aimed at enclosure from all practicable directions.
IP66 vs IP67: IP67 adds 1 m temporary immersion. IP66 vs IP68: IP68 allows continuous submersion per manufacturer spec. When specifying IP66 for a project, confirm the rating certificate from the manufacturer and consider that seals degrade over time with temperature cycling, UV exposure, and chemical contact.
Full specification table
| Parameter | Solid digit (6) | Liquid digit (6) |
|---|---|---|
| Protection level | Dust-Tight | Powerful Water Jets (12.5 mm nozzle) |
| Description | Protected against access to hazardous parts with a wire. No ingress of dust whatsoever. | Protection against powerful water jets. Water projected in powerful jets by a 12.5 mm nozzle against the enclosure from any direction shall have no harmful effects. |
| Test method | Dust chamber (talcum powder) for 8 hours (2 hours if equipment is in operation) with enclosure under reduced internal pressure; no dust ingress permitted. | Standard nozzle (12.5 mm diameter) at 100 kPa, 100 L/min; water aimed at enclosure from all practicable directions. |
| Object size / water pressure | No dust ingress | 100 kPa |
| Test distance | Per standard | 3 meters |
| Test duration | Per standard | 1 minute per m², min 3 minutes |
Typical applications
Outdoor industrial enclosures
Marine-grade equipment
High-end security cameras
Traffic control cabinets
Solar inverter enclosures
NEMA equivalent
Recommended products for IP66
IP66 outdoor enclosure
Marine-grade security camera
All IP66 comparisons
69 pairsIP66 offers higher overall protection than IP00. Choose IP66 for harsher environments; IP0
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