IP21 is an ingress-protection rating defined by IEC 60529. Read each digit separately. The first digit, 2, describes protection against solids: the enclosure keeps out solid objects 12.5 mm or larger, including fingers, but does not seal against dust. The second digit, 1, describes protection against liquids: it withstands vertically dripping water only, the kind produced by condensation or light overhead drips.
This makes IP21 a basic, indoor-oriented rating. It suits sheltered locations such as equipment rooms, cabinets, ceilings, and utility spaces, where the main risks are accidental contact and occasional dripping rather than dust or direct water.
It is not appropriate for:
- Outdoor or exposed mounting
- Dusty industrial floors
- Washdown, splash, or spray zones
- Any submersion or jetting
When selecting a LoRaWAN device, match the enclosure rating to the deployment. An under-rated enclosure risks moisture or particle ingress and early failure, while over-rating adds cost. For wetter or dirtier sites, step up to a higher second or first digit.
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Frequently asked questions
What does IP21 mean?
Under IEC 60529, the first digit 2 means the enclosure is protected against solid objects 12.5 mm and larger, such as fingers. The second digit 1 means it is protected against vertically falling drops of water (light dripping). It offers no protection against dust or angled, splashing, or pressurized water.
Is IP21 waterproof?
No. IP21 only resists water dripping straight down from above. It is not protected against sprays, splashes, jets, or immersion, so it is unsuitable for outdoor exposure, washdown areas, or wet environments. For those, choose a higher second-digit rating such as IP54, IP65, or IP67.
Where is an IP21 device suitable?
IP21 suits sheltered indoor settings where condensation or occasional drips may occur but dust ingress and direct water exposure are not concerns, for example utility cupboards, ceilings, or equipment rooms.