What Are IP Ratings and Why Do They Matter?
When choosing electrical equipment for your home or business, protection against dust, dirt and water is an important consideration. This is particularly relevant in Australia, where electrical equipment can be exposed to heavy rain, dust, outdoor conditions and changing weather.
This is where IP ratings (Ingress Protection ratings) come in. An IP rating indicates how well an electrical enclosure protects its internal components against solid objects, dust and water.
Whether you’re installing a solar system, battery storage unit, switchboard or outdoor electrical enclosure, understanding IP ratings can help you choose equipment suitable for its installation environment.
What Does an IP Rating Mean?
An IP rating consists of two numbers following the letters IP.
For example, IP65:
- First digit (6): Indicates protection against solid objects and dust.
- Second digit (5): Indicates protection against water.
The higher the numbers, generally the greater the level of protection against the corresponding hazards.
Understanding the Different Types of IP Ratings
Here is a breakdown of five commonly used IP ratings and where they are typically suitable.
1. IP20 – Basic Protection for Indoor Equipment
IP20 provides protection against solid objects larger than 12.5 mm, such as fingers. However, it offers no specific protection against water.
Key features:
- Protection against larger solid objects.
- No water protection.
- Suitable for dry indoor environments.
Common applications:
- Indoor electrical panels.
- Indoor switchboards.
- Electrical equipment installed in dry areas.
2. IP44 – Protection Against Water Splashes
IP44 provides protection against solid objects larger than 1 mm and water splashing from any direction.
Key features:
- Protection against small solid objects.
- Protection against water splashes.
- Suitable for certain sheltered outdoor applications.
Common applications:
- Outdoor electrical fittings.
- Bathroom electrical accessories where appropriately specified.
- Sheltered outdoor control equipment.
3. IP54 – Dust-Protected and Splash-Resistant
IP54 provides limited protection against dust ingress and protection against water splashes from any direction.
Key features:
- Dust-protected, but not completely dust-tight.
- Protection against water splashes.
- Suitable for some industrial and outdoor environments.
Common applications:
- Industrial control panels.
- Outdoor electrical enclosures.
- Equipment installed in areas with moderate dust exposure.
4. IP65 – Dust-Tight and Protected Against Water Jets
IP65 offers a higher level of protection, making it a popular choice for outdoor electrical equipment.
Key features:
- Completely dust-tight.
- Protected against water jets from any direction.
- Suitable for many exposed outdoor installations, subject to installation requirements.
Common applications:
- Outdoor electrical enclosures.
- Solar system electrical equipment.
- Battery control enclosures.
- Industrial electrical installations.
5. IP67 – Dust-Tight and Protected Against Temporary Immersion
IP67 provides complete protection against dust and protection against temporary immersion in water under specified test conditions.
Key features:
- Completely dust-tight.
- Protection against temporary immersion in water.
- Tested for immersion up to 1 metre for up to 30 minutes under the standard test conditions.
Common applications:
- Submersible-rated electrical junction boxes.
- Equipment used in environments where temporary flooding or immersion is a consideration.
- Specialised outdoor electrical installations.
Always check the manufacturer’s specifications, as an IP67 rating does not automatically mean equipment is suitable for permanent underwater use.
IP20 vs IP44 vs IP54 vs IP65 vs IP67: Quick Comparison
IP Rating | Dust Protection | Water Protection | Typical Application |
IP20 | Objects over 12.5 mm | No specific protection | Indoor panels |
IP44 | Objects over 1 mm | Water splashes | Sheltered outdoor fittings |
IP54 | Dust-protected | Water splashes | Industrial equipment |
IP65 | Dust-tight | Water jets | Outdoor electrical enclosures |
IP67 | Dust-tight | Temporary immersion | Specialised electrical equipment |
Which IP Rating Is Best for Solar Installations in Australia?
Solar panels, inverters, batteries and associated electrical equipment are often installed outdoors and exposed to Australian weather conditions. Choosing the right IP rating depends on the equipment, its location and the manufacturer’s installation requirements.
Here are some important considerations:
- Outdoor solar inverters: Look for an inverter with an IP rating appropriate for its intended installation location. IP65-rated equipment is commonly available for outdoor applications.
- Battery storage systems: Check the manufacturer’s specified IP rating for the battery enclosure and installation environment.
- Electrical switchboards: Select an enclosure with suitable dust and water protection based on whether it is installed indoors, under cover or fully exposed outdoors.
- Solar junction boxes: Ensure the enclosure and cable entries provide the required protection against environmental exposure.
Remember, a higher IP rating does not automatically mean better performance in every situation. Correct installation, ventilation, temperature management and compliance with Australian electrical requirements are equally important.
Final Thoughts
Understanding IP ratings makes it easier to select the right electrical equipment for your home or business. While IP20 may be suitable for basic indoor applications, IP65 and IP67 offer greater protection for specific outdoor and demanding environments.
For Australian solar installations, always check the manufacturer’s specifications and ensure the equipment is suitable for its intended location and complies with applicable Australian standards.
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