---
title: "IP66 / IP65 enclosure rating"
description: "IP66 and IP65 are IEC 60529 ingress-protection ratings indicating the degree to which an enclosure protects internal contents from dust and water. Both are dust-tight (the first digit \"6\"); they differ in water-protection level:"
canonical_url: "https://sylio.co/glossary/ip66-ip65-enclosure-rating"
last_updated: "2026-06-28T02:29:35.304Z"
---

**IP66** and **IP65** are IEC 60529 ingress-protection ratings indicating the degree to which an enclosure protects internal contents from dust and water. Both are dust-tight (the first digit "6"); they differ in water-protection level:

- **IP65** — protected against low-pressure water jets from any direction
- **IP66** — protected against powerful water jets from any direction

## Applications

IP65 and IP66 are the standard ratings for outdoor industrial [sonic horn](/glossary/sonic-horn) accessories — [solenoid valves](/glossary/solenoid-valve), [cycle controllers](/glossary/cycle-controller-sequencer), local pressure indicators and isolators. The horn body itself, being a flow-through pneumatic device, is not normally IP-rated.

## Related terms

- [NEMA enclosure rating](/glossary/nema-enclosure-rating)
- [Sonic horn](/glossary/sonic-horn)