IP66 vs IP52
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP66 and IP52 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 6 vs 5) and liquid protection (level 6 vs 2). IP66 is rated for dust-tight and powerful water jets (12.5 mm nozzle), while IP52 provides dust-protected and dripping water at 15° tilt.
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).
IP52 is an ingress protection code that ensures dust-protected (limited ingress, no harmful deposit) and protection against vertically falling drops of water when the enclosure is tilted up to 15° from its normal position.. It is an IEC 60529 ingress protection code combining first-digit (solid) level 5 with second-digit (liquid) level 2.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP66
6 — Dust-Tight
IP52
5 — Dust-Protected
Liquid protection (second digit)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
IP52
2 — Dripping Water at 15° Tilt
Dust-tight
IP66
Yes
IP52
Limited
Water-jet resistant
IP66
Yes
IP52
No
Submersible
IP66
No
IP52
No
Outdoor suitable
IP66
Yes
IP52
No
The exact difference (IP66 vs IP52)
Solid protection
IP66
Level 6 — Dust-Tight
IP52
Level 5 — Dust-Protected
IP66 provides "Dust-Tight" (level 6), while IP52 provides "Dust-Protected" (level 5). IP66 is 1 level higher.
Liquid protection
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP52
Level 2 — Dripping Water at 15° Tilt
IP66 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)), while IP52 handles 0.3 mm/min drip rate (Dripping Water at 15° Tilt). IP66 provides 4 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP66 offers higher overall protection than IP52. Choose IP66 for harsher environments; IP52 may suffice for milder conditions and can be more cost-effective.