IP66 vs IP6X
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP66 and IP6X are both IEC 60529 ingress protection codes, but they differ in liquid protection (level 6 vs 0). IP66 is rated for dust-tight and powerful water jets (12.5 mm nozzle), while IP6X provides dust-tight and no protection.
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).
IP6X is fully dust-tight—no ingress of dust whatsoever—with water protection not specified. The highest solid-protection rating, used where complete dust exclusion is critical.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP66
6 — Dust-Tight
IP6X
6 — Dust-Tight
Liquid protection (second digit)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
IP6X
0 — No Protection
Dust-tight
IP66
Yes
IP6X
Yes
Water-jet resistant
IP66
Yes
IP6X
No
Submersible
IP66
No
IP6X
No
Outdoor suitable
IP66
Yes
IP6X
No
The exact difference (IP66 vs IP6X)
Solid protection
IP66
Level 6 — Dust-Tight
IP6X
Level 6 — Dust-Tight
Both IP66 and IP6X share the same solid protection: Dust-Tight.
Liquid protection
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP6X
Level 0 — No Protection
IP66 provides "Powerful Water Jets (12.5 mm nozzle)" (level 6), while IP6X provides "No Protection" (level 0). IP66 is 6 levels higher.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP66 offers higher overall protection than IP6X. Choose IP66 for harsher environments; IP6X may suffice for milder conditions and can be more cost-effective.