IP66 vs IPX8
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP66 and IPX8 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 6 vs 0) and liquid protection (level 6 vs 8). IP66 is rated for dust-tight and powerful water jets (12.5 mm nozzle), while IPX8 provides no protection and continuous immersion (manufacturer-specified).
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).
IPX8 protects against continuous immersion under manufacturer-specified conditions (depth and duration), with solid protection not specified. The standard for submersible consumer electronics.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP66
6 — Dust-Tight
IPX8
0 — No Protection
Liquid protection (second digit)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
IPX8
8 — Continuous Immersion (manufacturer-specified)
Dust-tight
IP66
Yes
IPX8
No
Water-jet resistant
IP66
Yes
IPX8
Yes
Submersible
IP66
No
IPX8
Yes
Outdoor suitable
IP66
Yes
IPX8
Yes
The exact difference (IP66 vs IPX8)
Solid protection
IP66
Level 6 — Dust-Tight
IPX8
Level 0 — No Protection
IP66 provides "Dust-Tight" (level 6), while IPX8 provides "No Protection" (level 0). IP66 is 6 levels higher.
Liquid protection
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IPX8
Level 8 — Continuous Immersion (manufacturer-specified)
IP66 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)), while IPX8 handles Specified by manufacturer (Continuous Immersion (manufacturer-specified)). IPX8 provides 2 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP66 offers higher overall protection than IPX8. Choose IP66 for harsher environments; IPX8 may suffice for milder conditions and can be more cost-effective.