IP66 vs IP12
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP66 and IP12 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 6 vs 1) and liquid protection (level 6 vs 2). IP66 is rated for dust-tight and powerful water jets (12.5 mm nozzle), while IP12 provides > 50 mm — back of hand 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).
Designed for environments requiring protection against solid objects larger than 50 mm and protection against vertically falling drops of water when the enclosure is tilted up to 15° from its normal position., IP12 is an IEC 60529 code combining solid level 1 with liquid level 2.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP66
6 — Dust-Tight
IP12
1 — > 50 mm — Back of Hand
Liquid protection (second digit)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
IP12
2 — Dripping Water at 15° Tilt
Dust-tight
IP66
Yes
IP12
No
Water-jet resistant
IP66
Yes
IP12
No
Submersible
IP66
No
IP12
No
Outdoor suitable
IP66
Yes
IP12
No
The exact difference (IP66 vs IP12)
Solid protection
IP66
Level 6 — Dust-Tight
IP12
Level 1 — > 50 mm — Back of Hand
IP66 provides "Dust-Tight" (level 6), while IP12 provides "> 50 mm — Back of Hand" (level 1). IP66 is 5 levels higher.
Liquid protection
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP12
Level 2 — Dripping Water at 15° Tilt
IP66 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)), while IP12 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 IP12. Choose IP66 for harsher environments; IP12 may suffice for milder conditions and can be more cost-effective.