IP31 vs IP56
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP31 and IP56 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 3 vs 5) and liquid protection (level 1 vs 6). IP31 is rated for > 2.5 mm — tool / wire and vertically dripping water, while IP56 provides dust-protected and powerful water jets (12.5 mm nozzle).
The IP31 rating offers protection against solid objects larger than 2.5 mm and protection against vertically falling drops of water. Dripping water shall have no harmful effects.. It is an IEC 60529 ingress protection code combining first-digit (solid) level 3 with second-digit (liquid) level 1.
IP56 is dust-protected and resists powerful water jets (12.5 mm nozzle, 100 kPa). Suited to outdoor equipment subjected to heavy rain or hose-directed water.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP31
3 — > 2.5 mm — Tool / Wire
IP56
5 — Dust-Protected
Liquid protection (second digit)
IP31
1 — Vertically Dripping Water
IP56
6 — Powerful Water Jets (12.5 mm nozzle)
Dust-tight
IP31
No
IP56
Limited
Water-jet resistant
IP31
No
IP56
Yes
Submersible
IP31
No
IP56
No
Outdoor suitable
IP31
No
IP56
Yes
The exact difference (IP31 vs IP56)
Solid protection
IP31
Level 3 — > 2.5 mm — Tool / Wire
IP56
Level 5 — Dust-Protected
IP31 provides "> 2.5 mm — Tool / Wire" (level 3), while IP56 provides "Dust-Protected" (level 5). IP56 is 2 levels higher.
Liquid protection
IP31
Level 1 — Vertically Dripping Water
IP56
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP31 handles 0.1 mm/min drip rate (Vertically Dripping Water), while IP56 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)). IP56 provides 5 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP56 offers higher overall protection than IP31. Choose IP56 for harsher environments; IP31 may suffice for milder conditions and can be more cost-effective.