IP65 vs IP66
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP65 and IP66 are both IEC 60529 ingress protection codes, but they differ in liquid protection (level 5 vs 6). IP65 is rated for dust-tight and water jets (6.3 mm nozzle), while IP66 provides dust-tight and powerful water jets (12.5 mm nozzle).
IP65 is dust-tight and resists low-pressure water jets (6.3 mm nozzle, 30 kPa). It is the most common standard for fully exposed outdoor electronics such as lighting, cameras, and EV chargers.
IP66 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).
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP65
6 — Dust-Tight
IP66
6 — Dust-Tight
Liquid protection (second digit)
IP65
5 — Water Jets (6.3 mm nozzle)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
Dust-tight
IP65
Yes
IP66
Yes
Water-jet resistant
IP65
Yes
IP66
Yes
Submersible
IP65
No
IP66
No
Outdoor suitable
IP65
Yes
IP66
Yes
The exact difference (IP65 vs IP66)
Solid protection
IP65
Level 6 — Dust-Tight
IP66
Level 6 — Dust-Tight
Both IP65 and IP66 share the same solid protection: Dust-Tight.
Liquid protection
IP65
Level 5 — Water Jets (6.3 mm nozzle)
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP65 handles 30 kPa (Water Jets (6.3 mm nozzle)), while IP66 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)). IP66 provides 1 level more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP66 offers higher overall protection than IP65. Choose IP66 for harsher environments; IP65 may suffice for milder conditions and can be more cost-effective.