IP56 vs IP21
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP56 and IP21 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 5 vs 2) and liquid protection (level 6 vs 1). IP56 is rated for dust-protected and powerful water jets (12.5 mm nozzle), while IP21 provides > 12.5 mm — finger and vertically dripping water.
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.
Designed for environments requiring protection against solid objects larger than 12.5 mm and protection against vertically falling drops of water. Dripping water shall have no harmful effects., IP21 is an IEC 60529 code combining solid level 2 with liquid level 1.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP56
5 — Dust-Protected
IP21
2 — > 12.5 mm — Finger
Liquid protection (second digit)
IP56
6 — Powerful Water Jets (12.5 mm nozzle)
IP21
1 — Vertically Dripping Water
Dust-tight
IP56
Limited
IP21
No
Water-jet resistant
IP56
Yes
IP21
No
Submersible
IP56
No
IP21
No
Outdoor suitable
IP56
Yes
IP21
No
The exact difference (IP56 vs IP21)
Solid protection
IP56
Level 5 — Dust-Protected
IP21
Level 2 — > 12.5 mm — Finger
IP56 provides "Dust-Protected" (level 5), while IP21 provides "> 12.5 mm — Finger" (level 2). IP56 is 3 levels higher.
Liquid protection
IP56
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP21
Level 1 — Vertically Dripping Water
IP56 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)), while IP21 handles 0.1 mm/min drip rate (Vertically Dripping Water). IP56 provides 5 levels more liquid protection.
NEMA equivalents
Recommendation
IP56 offers higher overall protection than IP21. Choose IP56 for harsher environments; IP21 may suffice for milder conditions and can be more cost-effective.