IP15 vs IP31
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP15 and IP31 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 1 vs 3) and liquid protection (level 5 vs 1). IP15 is rated for > 50 mm — back of hand and water jets (6.3 mm nozzle), while IP31 provides > 2.5 mm — tool / wire and vertically dripping water.
With IP15, an enclosure receives protection against solid objects larger than 50 mm 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 1 with second-digit (liquid) level 5.
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.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP15
1 — > 50 mm — Back of Hand
IP31
3 — > 2.5 mm — Tool / Wire
Liquid protection (second digit)
IP15
5 — Water Jets (6.3 mm nozzle)
IP31
1 — Vertically Dripping Water
Dust-tight
IP15
No
IP31
No
Water-jet resistant
IP15
Yes
IP31
No
Submersible
IP15
No
IP31
No
Outdoor suitable
IP15
Yes
IP31
No
The exact difference (IP15 vs IP31)
Solid protection
IP15
Level 1 — > 50 mm — Back of Hand
IP31
Level 3 — > 2.5 mm — Tool / Wire
IP15 provides "> 50 mm — Back of Hand" (level 1), while IP31 provides "> 2.5 mm — Tool / Wire" (level 3). IP31 is 2 levels higher.
Liquid protection
IP15
Level 5 — Water Jets (6.3 mm nozzle)
IP31
Level 1 — Vertically Dripping Water
IP15 handles 30 kPa (Water Jets (6.3 mm nozzle)), while IP31 handles 0.1 mm/min drip rate (Vertically Dripping Water). IP15 provides 4 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP15 offers higher overall protection than IP31. Choose IP15 for harsher environments; IP31 may suffice for milder conditions and can be more cost-effective.