IP20 Rating Explained: What It Means, Where It Applies & Why It Matters
An ingress protection rating has been around since the days you bought a light fitting, an electrical appliance, or a home energy device, and if you noticed a small "IP" code on the packaging, you've seen one. Most people don't pay attention to it. This is typically not a problem, but when they put it in the wrong place, only to wonder why it didn't work, or when their insurance refused to cover the damage.
It only takes a couple of minutes to understand what the IP ratings are, and you can avoid costly errors. The purpose of this guide is to elaborate exclusively on the meaning of IP20, where it can and cannot be used, and why it is important for home electrical devices such as home energy storage systems.
What is IP20? Understanding the basics
The IP20 is a rating given to electrical appliances according to the international standard IEC 60529, which indicates the resistance of an electrical product to water ingress. It gives you two important points on how well a device is protected from foreign objects and moisture penetrating its case.
The term "IP" refers to Ingress Protection. The two numbers that follow each other convey different messages. In the case of IP20, the first digit is 2 and the second digit is 0.
Water/moisture rated protection is not provided, but an IP20 rating indicates the device's resistance to solid objects greater than 12.5mm (the thickness of a finger).
The key is the second digit being zero. It doesn't imply that when water drops on the device, it will immediately become unusable. It does not indicate that the manufacturer has made a waterproofing claim and should not be used in locations where there is moisture.
IP20 meaning — Breaking down the Code
The IEC 60529 standard uses a consistent format for all IP ratings. Here's what each digit means:
First digit — Solid particle protection (0–6):
0: No protection
1: Protected against objects larger than 50mm
2: Protected against objects larger than 12.5mm (fingers)
3: Protected against objects larger than 2.5mm (tools)
4: Protected against objects larger than 1mm (wires)
5: Dust protected
6: Dust-tight
Second digit — Liquid ingress protection (0–9):
0: No protection
1: Protected against vertically dripping water
4: Protected against water splashing from any direction
5: Protected against water jets
7: Protected against temporary immersion
8: Protected against continuous immersion
This means IP20: Finger-safe, No Water protection. It is a rating system for products intended to be used in a clean, dry, indoor setting where the primary risk is accidental contact with fingers or other objects of a similar size, and not tools, dust, or moisture.
IP20 vs Other IP Ratings — How does it compare?
IP20 vs IP44, IP55, IP65 — What's the Difference?
Understanding where IP20 sits in the broader landscape of ratings helps clarify what it's designed for.
Rating | Solid Protection | Water Protection | Typical Use |
IP20 | Fingers (12.5mm+) | None | Dry indoor environments |
IP44 | Objects 1mm+ | Splashing water | Bathrooms (zone 2), covered outdoor areas |
IP55 | Dust protected | Water jets | Outdoor covered areas, industrial |
IP65 | Dust tight | Water jets | Outdoor exposed environments |
IP67 | Dust tight | Temporary immersion | Outdoor, wet environments |
The difference between IP20 and IP44 is quite large. IP44 is also the minimum level of water splash protection specified for bathroom area 2 fittings, bringing meaning to water splash protection. For outdoor devices in the elements, you'd expect to get an IP65 rating.
For IP20, the figure is lower, not because it's not good quality, but because its intended use is in a specific environment that doesn't require a higher level of protection.
Which IP rating do you need for your device?
The appropriate IP rating completely depends on the installation location and the elements it will encounter:
IP20 — Dry indoor rooms: living rooms, bedrooms, hallways, utility rooms, home offices. No moisture exposure.
IP44 — Bathroom zone 2 (more than 0.6m from a bath or shower), covered outdoor areas with indirect exposure to moisture.
IP55/IP65 — Outdoor areas with direct exposure to rain, garden environments, and exposed patios.
IP67/IP68 — Environments with water immersion risk, marine applications, underground installations.
The idea is to match the IP rating with the worst conditions the device will be used in regularly. Placing a device in an environment where it is rated for less extends the warranty's coverage to the extreme, poses safety hazards, and could lead to a loss of coverage on your home insurance.
Where can IP20-Rated devices be used?
IP20 indoor applications
Most household electrical appliances in dry rooms have an IP20 rating. Notice the IP rating of all your home electronics: TVs, computers, audio equipment, indoor lighting, household gear, etc. – a lot of them will have a rating of IP20 or lower.
IP20-rated devices can be used in:
Living rooms and lounges
Bedrooms
Home offices and studies
Hallways and landings
Utility rooms (away from water sources)
Garages (dry, no moisture exposure)
Indoor storage areas
All of these sites have this in common: they're dry! No condensation, no splashing, no excess moisture inside than what is normally found in an indoor environment.
IP20 and bathroom use — what you need to know
This is a frequently asked question about IP20-rated devices, and the answer is simple: IP20-rated devices are not suitable for installation in the bath.
The rules for wiring in UK bathrooms split the areas into zones and specify minimum IP ratings for these zones:
Zone 0 — Inside the bath or shower itself. Minimum IP67 required.
Zone 1 — Directly above the bath or shower to a height of 2.25m. Minimum IP45 required.
Zone 2 — The area within 0.6m horizontally from the edge of zone 1, and areas directly above zone 1 up to 2.25m. Minimum IP44 required.
Outside zones — Areas outside of zone 2 in a bathroom. If there is no danger of water contact, IP20 can be considered here as well, but that needs to be carefully evaluated. Many installers opt to use IP44 in bathrooms to give them a safety margin in practice.
Fitting an IP20-rated fitting in a bathroom area where an IP44 or IP45 fitting is required is a Building Regulations contravention and a real safety risk. Before buying any bathroom electrical fitting, it is always important to check the zone requirements.
Note: Bathroom electrical regulations are governed by Part P of the Building Regulations in England and Wales and BS 7671 (IET Wiring Regulations 18th Edition). Requirements are subject to update — always refer to the latest guidance or consult a qualified electrician before installation.
IP20 Lighting — Where it can and cannot be installed
IP20 light fittings are readily available and are ideal for dry areas in the house. Bedrooms, living rooms, hallways, and home offices: Ceiling pendants, recessed downlights, wall and floor lamps rated IP20 work well in these areas. If you are thinking of lighting the entire house, it's worth learning about smart home lighting that can complement energy-efficient home lighting.
In areas where IP20 lighting is not possible:
Inside bathrooms (zones 0, 1, or 2)
In areas with steam or condensation (above kitchen hobs without adequate ventilation)
In outdoor locations exposed to rain or moisture
In covered outdoor areas where condensation may form
When buying lights for any room that contains moisture, always look for the IP rating. When a light fitting with an IP20 rating is put in the wrong location, it's not just a warranty problem; it's a fire and electric shock hazard.
Ingress protection IP20 and home energy storage
Why IP20 is the standard for indoor energy storage devices
Battery packs, inverters, and solar battery systems are primarily intended for indoor use in dry environments. This is a suitable and widely used rating for this type of equipment. For those new to the subject, our guide to solar battery storage will give you a summary of how it works and what to consider when picking a solar battery storage solution.
The reasoning is straightforward. Batteries and electronics do not like water. Low humidity or condensation, even if it is really low, can cause it to degrade, short out, or eventually become a safety risk. When building a home battery system for dry indoor installations, manufacturers can focus on optimising the system for performance, durability, and safety without the extra complexity and expense of weatherproofing the entire system.
Home batteries with accessible terminals and connectors are also relevant to IP20 protection against finger contact.
What does IP20 mean for home solar battery installation
The IP20 rating is of significance to homeowners who are thinking about installing a solar battery system, as it will have implications for where the battery system can be installed.
Primary installation location: indoors. The best place for an IP20-rated home battery is in an indoor, dry space. Any spaces that are not bathrooms or kitchens will do, such as a living room, a utility room, a hallway, or a garage (provided it remains dry). The device will be protected from temperature extremes, condensation, and moisture in the indoor environment, which might impact battery performance and life over time.
Secondary options: covered balconies or patios. Battery units are sometimes located in an outdoor, but sheltered, area like a covered balcony or patio where they are shielded from direct exposure to the rain. For those interested in balcony solar installations, our balcony solar panel guide provides a more comprehensive overview of the factors to consider. This should be carefully considered, though, as temperature changes and humidity levels in outdoor areas, even under cover, are often a lot higher than in a dry indoor room. When in any doubt, it's always safer and more reliable to install it indoors.
What to avoid: Never install an IP20-rated battery in an exposed outdoor location, in direct contact with rain, or in an area prone to condensation or flooding.
Best home solar battery solutions with indoor safety ratings
The ideal home battery system for the UK resident seeking the lowest electricity costs and maximising the use of solar energy is a combination of good technical functionality and suitable home safety ratings for indoor use. The following are both solutions for dry indoor use, and both provide good, long-term home energy storage capabilities. Also, if you're not already installing solar panels, you might not want to miss out on home battery storage without solar, which is a great way to start with solar storage if you want to.
EcoFlow STREAM Ultra X — Indoor Solar Battery Storage
The STREAM Ultra X is a home solar battery that is integrated with a built-in inverter to plug straight into the electrical system. It stores solar power during the day and returns it to your electric circuit to power your appliances – instead of using electricity from the grid.
The STREAM Ultra X is engineered for indoor installation in a dry environment and will fit into a living space, utility room, or hallway without exposure to the outdoors. The unit has a capacity of 3.84 kWh and can provide a continuous output of up to 1200W. When paired with a second unit, it becomes 2,300W, which is sufficient for high-demand appliances that are being used simultaneously.
EcoFlow STREAM Ultra X All-in-One Home Storage Kit
This kit offers everything required for a complete, ready-to-install solar storage system, including solar panels, a battery unit, and all components needed. The built-in inverter converts the direct current (DC) to alternating current (AC), while the EcoFlow app allows you to monitor the generation, storage, and consumption of energy in real time.
How to check the IP rating of any device
Determining the IP rating of an electrical device is typically easy:
Review the packaging of the product. This is usually printed on the box in conjunction with other technical specifications.
Follow product instructions (manual or datasheet). The manual or the manufacturer's datasheet will specify the IP rating of the box if it is to be discarded.
Look for the manufacturer's website. The majority of reputable manufacturers will give full technical specifications for all their products online.
Check the device for the marking. The IP rating is directly moulded or printed onto the case of many devices.
Ask the retailer. For items that are not clearly rated, inquire prior to buying, especially bathroom items, outdoor items, or items that will be placed in areas where there is moisture.
If there is no IP rating listed for a device, consider it unrated and use only in a clean, dry indoor environment.
Common misconceptions about IP20
"IP20 means it's completely safe from any external contact." IP20 is to protect from contact with objects bigger than 12.5mm and fingers. Will not protect against smaller objects and dust, and it will not protect from moisture. It's a level of protection that can be useful in the case of clean indoor environments, but it is not a total seal.
"No water rating means it will immediately fail if it gets wet." Not necessarily, but that means there is no protection designed or tested. Depending on the circumstances, an IP20 device might fail immediately, or may degrade over time, or not suffer from any apparent damage. None of these alleviates the fact that it is unsafe and unsupported to use in a wet environment.
"IP20 is fine for bathrooms if it's not directly in the shower." This is incorrect. In the case of bathroom zones, a minimum of IP44 is required even if the area is far from the shower/bath. According to the latest regulations, IP20 is not suitable anywhere in the interior of the bathrooms in the UK.
"A higher IP rating is always better." Not always. The higher the IP rating, the more expensive the device will be, and in some cases may have different design compromises. An IP65 device is not necessarily as effective as an IP20 device used in a dry indoor setting: it's just for different environments. Always match the rating to the environment and not to the maximum number.
"IP ratings are a UK standard." The international IEC 60529 standard is followed by IP ratings, and it is adopted throughout Europe and internationally. An IP20 rating on a device sold in the UK, Germany, or Australia is the same.
Conclusion
When you know what the two numbers really represent, IP20 is an easy-to-understand marking system. It states that it is resistant to finger contact and objects more than 12.5mm in size, but has no water protection. It's totally fitting for dry indoor spaces — and totally unsuitable for bathrooms, outdoor venues, or any other space where there's moisture.
In the case of home energy storage, IP20 is a conscious design decision: batteries and inverters work best and last longer when they are located in a controlled, dry indoor environment. Knowing your rating will enable you to install your system properly, preserve the warranty, and ensure that you reap the most benefits from that investment in the long run.
If you're selecting a light fitting, looking for a solar battery, or purchasing a home appliance, spending 30 seconds to check the IP rating and confirming it's suitable for the installation location could save you a lot of money.
FAQs
What is IP20?
IP20 is an international IEC 60529 ingress protection standard. Means protection against solid objects greater than 12.5mm (e.g., fingers) but does not have a rated protection from water/moisture. It will only work in clean, dry, interior spaces.
What is the IP20 rating used for?
Electrical equipment designed for use in dry indoor locations, such as household electronics, indoor light fixtures, home appliances, and energy storage systems for the indoor environment, is suitable for use with IP20. The normal rating for most consumer electronics found in living rooms, bedrooms, hallways and similar dry applications.
Can IP20 devices be used in bathrooms?
No. UK bathroom regulations specify a minimum rating of IP44 in zone 2 (within 0.6m of a bath or shower) and higher ratings for zones nearer to the water. IP20 devices should not be used in the bathroom or in any bathroom zone.
What does IP20 mean for home energy storage devices?
In the case of a home solar battery and solar inverter, the IP20 rating means that the product is intended for installation indoors in a dry environment. The ideal and recommended installation site is a utility room, hallway, living room, or dry garage. The battery is not IP20 rated, and placing an IP20-rated battery in an exposed outdoor location or in an area that is subject to moisture will render the battery unsafe to use and may be covered by the warranty.
Is IP20 suitable for outdoor use?
No, IP20 will not protect against rain, moisture or humidity. The minimum standards are IP44 for covered outdoor spaces and IP65 for uncovered outdoor spaces. Never use an IP rating lower than the conditions the device will be subjected to.