In an industrial project, the choice of an electrical enclosure is not limited to its dimensions or cost. The environment in which it will be installed directly influences its lifespan, the safety of the equipment it protects, and future maintenance costs.
Permanent humidity, saline atmosphere, chemicals, dust, UV radiation or even risks of mechanical shocks: all these constraints can quickly degrade an unsuitable building envelope.
It is precisely in these contexts that the
Vous devez encore choisir le bon niveau de protection. Les indices IP et IK, parfois appelés indice de produit, permettent précisément d’évaluer la capacité d’une boîte à résister aux infiltrations d’eau, à la poussière et aux impacts.
In this guide, we explain how to interpret these indices, why polyester is often the best choice for harsh environments, and how to select a solution that is truly suited to your application.
Why the polyester box has become a standard in the industrial sector
For a long time, galvanized steel or stainless steel enclosures were the preferred solution in industry. However, evolving environmental constraints and the desire for reduced maintenance have gradually favored the development of fiberglass-reinforced polyester enclosures.
Today, they are used in everything from wastewater treatment plants to road infrastructure, electrical networks, photovoltaic installations and chemical sites.
A natural resistance to corrosion
Unlike a metal case, a polyester case does not depend on an anti-corrosion coating to ensure its longevity.
Even when painted or galvanized, metal boxes remain susceptible to scratches, cuts, or damage from fasteners. Once the protective coating is compromised, corrosion can gradually develop.
In humid environments or those laden with chemical agents, this degradation often leads to:
- an aesthetic deterioration;
- a decrease in mechanical resistance;
- an increase in maintenance operations;
- premature replacements.
Fiberglass-reinforced polyester eliminates this risk since it does not oxidize and retains its properties over time, even in the presence of humidity, salt spray or aggressive chemicals .
Excellent electrical insulation
One of the main advantages of polyester lies in its insulating nature.
Unlike a metallic enclosure, it does not conduct electricity. This characteristic facilitates the production of Class II equipment , which is particularly sought after when operator safety is a priority.
This insulation reduces the risks of indirect contact and also simplifies certain grounding requirements.
For design offices as well as for maintenance managers, this is often a decisive advantage.
Better resistance to climate variations
Equipment installed outdoors is subject to constant thermal cycles.
During the day, a box exposed to the sun can rise significantly in temperature before cooling down rapidly at night.
These variations promote internal condensation, the main enemy of electronic components.
Polyester has lower thermal conductivity than steel or aluminum. This property limits temperature fluctuations inside the enclosure and helps protect sensitive equipment.
Naturally, when thermal constraints become significant, ventilation or suitable accessories remain essential.
Good to know
A high IP rating does not protect against condensation. Condensation arises from internal temperature variations. Therefore, good thermal design is just as important as the level of sealing.
Polyester, steel or stainless steel: which material to choose?
The choice always depends on the site constraints.
| Criterion | Polyester box | Galvanized steel | Stainless steel |
|---|---|---|---|
| corrosion resistance | excellent | Average | Very good |
| Electrical insulation | excellent | Low | Low |
| Weight | Lightweight | Medium | High |
| Maintenance | Low | Average | Low |
| Total cost over time | Highly competitive | Variable | High |
In a typical industrial environment, several materials may be suitable.
On the other hand, as soon as the installation is exposed to permanent humidity, corrosive atmospheres, sea spray or chemicals, polyester generally takes the advantage thanks to its durability and reduced maintenance costs.
Understanding IP and IK protection ratings
Many specifications require an IP66 IK10enclosure without always explaining what these values actually mean.
However, a good choice is not to systematically select the highest index, but the one that truly corresponds to the constraints of the field.
What does the IP index mean?
Defined by the NF EN 60529 standard , the IP (Ingress Protection) index indicates the level of protection offered by an enclosure against the penetration of solid objects and liquids.
It consists of two digits.
The first concerns dust.
The second concerns water.
For example :
- IP54 : Protection against limited amounts of dust and against splashing water.
- IP65 : Total protection against dust and water jets.
- IP66 : Total protection against dust and powerful water jets.
An IP66 polyester enclosure is particularly recommended when equipment is exposed to weathering, high-pressure cleaning, or significant splashes.
The IK index: often overlooked, yet essential
The IK index measures the resistance of an envelope to mechanical impacts.
Defined by the EN 62262 standard , it ranges from IK00 to IK10.
An IK10 enclosure can withstand an impact of 20 joules, which is equivalent to a 5 kg mass falling from 40 cm.
This feature is essential in the installations:
- on public roads;
- in the tunnels;
- on railway networks;
- in pumping stations;
- in areas accessible to the public.
In these environments, an excellent IP rating loses all its value if the enclosure can be damaged by an impact.
How to choose the right level of protection?
The best index is the one that precisely meets the constraints of your installation.
Before choosing a gift set, ask yourself five simple questions:
- Will the box be installed indoors or outdoors?
- Is there a risk of corrosion?
- Can the equipment withstand impacts?
- Do the devices produce heat?
- Is regular maintenance planned?
The answers help determine whether an IP54 enclosure is sufficient or whether an IP66 IK10model is the most relevant solution.
A common mistake: believing that “more IPs” always means “better protection”
One mistake is to systematically impose an IP66 or IP67 rating without analyzing the actual constraints.
A very airtight envelope limits air exchange with the outside.
In some applications, this promotes the formation of condensation, especially when temperatures vary greatly between day and night.
In these situations, an IP65 enclosure combined with suitable ventilation can offer better protection for electronic components than a completely sealed enclosure.
The choice should therefore always be made taking into account the entire environment and not just the IP value displayed on the technical data sheet.
Europoly polyester box: which ranges for which uses?
The choice of a polyester enclosure does not depend solely on its IP or IK rating. Dimensions, type of installation, equipment accessibility, and maintenance constraints are equally important factors.
The objective is to select an enclosure capable of protecting the components today, but also of supporting future developments in the installation without requiring a complete replacement.
It is with this in mind that Europoly has developed several product ranges adapted to different industrial environments.
Mini Euro: the compact solution for the most demanding environments
The Mini Euro range meets the needs of installations where space is limited without compromising on protection.
With a rating of up to IP66 IK10 , these enclosures are particularly suitable:
- to pumping stations;
- to water treatment facilities;
- to irrigation networks;
- to control and command equipment;
- for industrial applications exposed to water spray or dust.
Their design in fiberglass-reinforced polyester allows them to withstand corrosive environments for a long time, where a metal box would require regular maintenance.
Molded gaskets, mounting plates, the many available dimensions and various accessories also facilitate the work of integrators and maintenance teams.
Euro Medium and Maxi Euro: for larger capacity installations
When the needs go beyond a simple wall cabinet, polyester cabinets become the most relevant solution.
The Euro Medium and Maxi Euro ranges are designed to accommodate larger equipment:
- industrial automation;
- power tables;
- variable speed drives:
- telecommunications equipment;
- monitoring systems.
Their modular architecture allows for easy integration of chassis, plates, DIN rails or specific equipment while maintaining an excellent level of protection.
They are particularly used in:
- road infrastructure;
- the tunnels;
- railway networks;
- photovoltaic power stations;
- pumping stations;
- energy distribution facilities.
Their IK10 mechanical resistance is a real advantage when the equipment is accessible to the public or likely to be exposed to vandalism.
Which box set to choose according to your environment?
The table below allows you to quickly choose the level of protection.
| Environment | Recommended level |
|---|---|
| Wastewater treatment plant | IP66 IK10 polyester enclosure |
| Chemical industry | IP66 IK10 polyester enclosure |
| Seaside | Fiberglass-reinforced polyester |
| Road network | IP65 IK10 polyester cabinet |
| Photovoltaic park | IP66 polyester enclosure |
| Street lighting | IP65 IK10 |
| Drinking water network | IP66 IK10 |
| Food processing industry | IP65 or IP66 depending on the washing procedures |
However, each project remains unique. An analysis of the actual constraints often makes it possible to avoid costly oversizing while ensuring long-term protection.
Best practices for choosing a durable polyester box
Choosing a high-performance enclosure is not about selecting the model with the highest technical specifications. It is primarily about finding the best compromise between protection, maintenance, scalability, and operating costs.
Don’t choose solely based on the IP rating.
In many tenders, the first line of the specifications simply states “IP66 IK10”.
However, this information is not enough.
Two sets displaying exactly the same rating can have very different performances depending on:
- their material;
- the quality of the seals;
- Their design
- Their exposure to the sun
- Their ventilation
- their installation method.
The IP rating certifies a level of protection during standardized tests. It does not indicate the material’s resistance to aging after ten or fifteen years of use.
This is why choosing polyester is often a profitable investment in the long term.
Also consider maintenance
An industrial enclosure must protect the equipment, but also allow technicians to intervene quickly.
Before choosing a gift set, it is advisable to check:
- the ease of removing the doors;
- the accessibility of components;
- the possibilities of adding accessories;
- compatibility with future developments of the project.
A difficult-to-maintain cabinet can quickly generate operating costs that exceed the savings made at the time of purchase.
Anticipating changes in the installation
Industrial facilities rarely evolve in their initial configuration.
Adding automation systems, new power supplies, additional sensors or communication equipment: needs often increase over the years.
Planning for a volume slightly greater than immediate needs generally avoids the need to replace the entire case a few years later.
This approach reduces investment costs while limiting operational interruptions.
Key points to remember
A properly sized enclosure is one that can grow with your installation. The purchase cost often represents a small portion of the overall cost of ownership compared to maintenance interventions or premature replacements.
Why trust Europoly?
Choosing an enclosure is not based solely on a technical specification. It requires a thorough understanding of the installation environment and the constraints the equipment will face over several decades.
Specializing in polyester enclosures for harsh environments, Europoly designs solutions used in numerous sectors:
- water treatment;
- chemical industry;
- transport infrastructure;
- energy distribution;
- urban networks;
- renewable energies.
Thanks to its design office, the company assists integrators and engineering offices in choosing the level of protection truly suited to each project.
The objective remains the same: to guarantee the reliability of the installation while limiting maintenance costs in the long term.
Fiberglass-reinforced polyester is naturally corrosion-resistant, offers excellent electrical insulation, and requires less maintenance than a metal enclosure installed in an aggressive environment.
Both ratings provide complete protection against dust. However, IP66 is more resistant to powerful water jets than IP65, making it more suitable for highly exposed outdoor installations or washing areas.
IK10 indicates that a box can withstand a mechanical shock of 20 joules, which is one of the highest levels of protection defined by the EN 62262 standard.
Yes. The IP rating protects against external infiltration, but not against condensation caused by internal temperature variations. Good thermal management remains essential.
Yes. Polyester boxes intended for outdoor use are designed to withstand UV radiation and weathering over time, which limits their aging.
They are particularly present in water treatment, the chemical industry, road infrastructure, electrical networks, ports, photovoltaic installations and sites exposed to corrosion.
Conclusion
The choice of a polyester enclosure should never be limited to a simple IP or IK rating. While these values allow you to assess the level of protection against water, dust or impacts, they do not replace a comprehensive analysis of the installation environment.
The material of the casing, corrosion resistance, thermal constraints, ease of maintenance and the prospects for the evolution of the installation are all criteria that directly influence the lifespan of the equipment.
By prioritizing a solution adapted to the real constraints of the field, it is possible to reduce maintenance interventions, improve the availability of installations and secure investments in the long term.
Do you want to identify the most suitable level of protection for your project or compare different industrial enclosure solutions? The Europoly teams can assist you in analyzing your technical constraints in order to select the most appropriate polyester enclosure for your environment.