IP58 vs IP66
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP58 and IP66 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 5 vs 6) and liquid protection (level 8 vs 6). IP58 is rated for dust-protected and continuous immersion (manufacturer-specified), while IP66 provides dust-tight and powerful water jets (12.5 mm nozzle).
IP58 is dust-protected and rated for continuous immersion in water under manufacturer-specified conditions. A niche rating for equipment that must operate submerged while allowing limited dust ingress.
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).
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP58
5 — Dust-Protected
IP66
6 — Dust-Tight
Liquid protection (second digit)
IP58
8 — Continuous Immersion (manufacturer-specified)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
Dust-tight
IP58
Limited
IP66
Yes
Water-jet resistant
IP58
Yes
IP66
Yes
Submersible
IP58
Yes
IP66
No
Outdoor suitable
IP58
Yes
IP66
Yes
The exact difference (IP58 vs IP66)
Solid protection
IP58
Level 5 — Dust-Protected
IP66
Level 6 — Dust-Tight
IP58 provides "Dust-Protected" (level 5), while IP66 provides "Dust-Tight" (level 6). IP66 is 1 level higher.
Liquid protection
IP58
Level 8 — Continuous Immersion (manufacturer-specified)
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP58 handles Specified by manufacturer (Continuous Immersion (manufacturer-specified)), while IP66 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)). IP58 provides 2 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP58 offers higher overall protection than IP66. Choose IP58 for harsher environments; IP66 may suffice for milder conditions and can be more cost-effective.