IP66 vs IP05
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP66 and IP05 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 6 vs 0) and liquid protection (level 6 vs 5). IP66 is rated for dust-tight and powerful water jets (12.5 mm nozzle), while IP05 provides no protection and water jets (6.3 mm nozzle).
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).
Under IEC 60529, IP05 specifies no protection against solid objects and protection against water jets. Water projected by a 6.3 mm nozzle against the enclosure from any direction shall have no harmful effects.. It is an IEC 60529 ingress protection code combining first-digit (solid) level 0 with second-digit (liquid) level 5.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP66
6 — Dust-Tight
IP05
0 — No Protection
Liquid protection (second digit)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
IP05
5 — Water Jets (6.3 mm nozzle)
Dust-tight
IP66
Yes
IP05
No
Water-jet resistant
IP66
Yes
IP05
Yes
Submersible
IP66
No
IP05
No
Outdoor suitable
IP66
Yes
IP05
Yes
The exact difference (IP66 vs IP05)
Solid protection
IP66
Level 6 — Dust-Tight
IP05
Level 0 — No Protection
IP66 provides "Dust-Tight" (level 6), while IP05 provides "No Protection" (level 0). IP66 is 6 levels higher.
Liquid protection
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP05
Level 5 — Water Jets (6.3 mm nozzle)
IP66 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)), while IP05 handles 30 kPa (Water Jets (6.3 mm nozzle)). IP66 provides 1 level more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP66 offers higher overall protection than IP05. Choose IP66 for harsher environments; IP05 may suffice for milder conditions and can be more cost-effective.