IP66 vs IPX7
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP66 and IPX7 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 6 vs 0) and liquid protection (level 6 vs 7). IP66 is rated for dust-tight and powerful water jets (12.5 mm nozzle), while IPX7 provides no protection and temporary immersion (up to 1 m).
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).
IPX7 resists temporary immersion up to 1 meter for 30 minutes, with solid protection not specified. Common for portable electronics that may be dropped in water.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP66
6 — Dust-Tight
IPX7
0 — No Protection
Liquid protection (second digit)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
IPX7
7 — Temporary Immersion (up to 1 m)
Dust-tight
IP66
Yes
IPX7
No
Water-jet resistant
IP66
Yes
IPX7
Yes
Submersible
IP66
No
IPX7
Yes
Outdoor suitable
IP66
Yes
IPX7
Yes
The exact difference (IP66 vs IPX7)
Solid protection
IP66
Level 6 — Dust-Tight
IPX7
Level 0 — No Protection
IP66 provides "Dust-Tight" (level 6), while IPX7 provides "No Protection" (level 0). IP66 is 6 levels higher.
Liquid protection
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IPX7
Level 7 — Temporary Immersion (up to 1 m)
IP66 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)), while IPX7 handles Hydrostatic ~10 kPa at 1 m (Temporary Immersion (up to 1 m)). IPX7 provides 1 level more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP66 offers higher overall protection than IPX7. Choose IP66 for harsher environments; IPX7 may suffice for milder conditions and can be more cost-effective.