Did You Know – Ingress Protection (IP) Testing for IoT Devices

Electric and electronic equipment are inherently vulnerable to their environment. When water or dust enters a device, performance degrades, failures occur, and safety risks increase. This risk is amplified in IoT devices, which are often deployed outdoors, in industrial areas, or in unattended locations.

To address this, the International Electrotechnical Commission (IEC) developed the Ingress Protection (IP) rating system, now widely used across industries to describe how well an enclosure resists the ingress of solids and liquids.

Yet despite its widespread use, IP ratings remain one of the most misunderstood aspects of product compliance.

Marketing Myth Around IP Ratings

Terms such as waterproof or water-resistant are frequently used in marketing—especially for smartphones and IoT devices. Unfortunately, these terms have no standardized technical meaning.

What does have a defined meaning is the IP rating, established under IEC 60529.

But here’s the critical distinction that is often missed:

IP ratings are not certifications

They are statements of conformity based on testing

An enclosure is not “IP65” or “IP68” because it was designed that way.

It is only IP-rated after it has successfully passed defined tests.

What IEC 60529 Actually Does

IEC 60529 was developed to:

• Grade the resistance of enclosures against dust and liquid ingress
• Assess protection against access to hazardous parts
• Define test methods to verify these protections

The standard applies to electrical equipment with rated voltages up to 72.5 kV and is prepared by IEC Technical Committee 70.

Importantly, IEC 60529 does not approve products—it defines how protection must be tested and demonstrated.

Understanding the IP Code Structure

The IP code consists of two numerals:

First Numeral – Protection Against Solids

Rated from 0 to 6:

• 0 – No protection
• 1–4 – Protection against large to small solid objects
• 5 – Dust-protected (limited ingress allowed)
• 6 – Dust-tight (no ingress of dust)

Second Numeral – Protection Against Liquids

Rated from 0 to 9:

• 0 – No protection
• 1–4 – Dripping and splashing water
• 5–6 – Water jets and powerful water jets
• 7 – Temporary immersion
• 8 – Continuous immersion (manufacturer-defined conditions)
• 9 – High-pressure, high-temperature water jets

Each combination (IP45, IP56, IP65, IP68, etc.) represents a specific level of tested protection, not a generic approval.

Why This Matters More for IoT Devices

IoT devices are rarely simple enclosures. They include:

• Cables and connectors
• Antennas and vents
• Displays and seals
• Long-term exposure to temperature and pressure variation

Even if individual components are “IP-rated,” the final assembled product may fail. That’s why testing must be performed on the complete device, not just the enclosure.

IP Ratings = Conformity Through Testing

An IP rating becomes valid only when the product has been tested according to IEC 60529.

Without testing:

• The IP marking is only a claim
• Customers and tender authorities have no technical proof
• Liability and rejection risks increase

This is why IP ratings should be viewed as conformity statements, not certifications.

Why ISO/IEC / NABL 17025–Accredited Labs Are Essential

A reliable conformity claim can only come from a competent testing laboratory.

Testing carried out by ISO/IEC 17025–accredited laboratories, including NABL-accredited labs, ensures:

• Use of validated test methods
• Calibrated and traceable equipment
• Controlled and repeatable conditions
• Test reports accepted by regulators, customers, and tender committees

Such labs don’t just test products—they create defensible evidence of compliance.

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