Have you ever had these experiences: when you charge your phone with a fast charger, the nearby WiFi suddenly slows down, the phone screen occasionally flickers randomly, or there is a buzzing noise when you get close to a radio? Most of these are caused by electromagnetic interference from chargers. For charging products to be sold in countries of the Eurasian Economic Union such as Russia and Kazakhstan, controlling such interference within the legal scope is a mandatory hurdle — this is the EAC Electromagnetic Compatibility Technical Regulation (TR CU 020/2011) we are going to talk about today.
Must-Know Basics: What Does This Regulation Cover
To understand TR CU 020/2011, we must start with electromagnetic compatibility (EMC for short). In plain terms for charging scenarios, the core logic of electromagnetic compatibility is: when a device is working, it will neither interfere with the normal use of other devices nor be affected by external interference in its own functions. The common issues we encounter, such as fast charging causing WiFi lag, phone screen flickering during charging, and noise from a radio near a charger, are all common manifestations of non-compliant electromagnetic compatibility. The goal of compliance is not to completely eliminate interference, but to control it within the range permitted by regulations, so that it does not affect the normal use of other devices and the device itself.
The core positioning of this regulation is a technical regulation under the EAC mandatory certification system of the Eurasian Economic Union (EAEU), which specifically controls the electromagnetic compatibility of electrical and electronic products, and is one of the core access requirements for charging products to enter the Eurasian market. Its applicable area covers 5 member states of the Eurasian Economic Union: Russia, Kazakhstan, Belarus, Armenia, and Kyrgyzstan. If the product is non-compliant, in mild cases it cannot clear customs, in severe cases it will be fined, banned from sale, or even required to be recalled across all channels.
There are two most common misconceptions that must be clarified first:
First, there is no separate “EAC EMC certification”. TR CU 020/2011 is one of the many technical regulations that EAC compliance needs to meet, not an independent certification category. The final product is affixed with the unified EAC mark, and no EMC-related words will be marked separately.
Second, overseas certifications or test reports such as CE-EMC and FCC cannot themselves replace the TR CU 020/2011 declaration of conformity and the required conformity assessment evidence. Test evidence shall be prepared in accordance with the applicable declaration scheme; some schemes require the use of laboratories included in the unified list of EAEU accredited laboratories. Whether overseas reports can be used as supplementary technical evidence shall be determined by the applicable scheme and registration requirements.
Applicable Boundaries: Does Your Charging Product Need to Meet the Requirements
Many sellers of charging products are most confused about whether their products need to comply with TR CU 020/2011. Let’s start with the clear scope.
Common Charging Products That Must Comply
As long as they are charging-related products with active electronic circuits and sold independently, they are basically within the mandatory scope. Common ones include:
• Wall-mounted chargers, power adapters, and various USB fast chargers (whether they use GaN (gallium nitride) technology, or PD or QC protocols, all fall within the scope);
• Charging cables with active components, such as PD fast charging cables with E-Marker chips, cables with indicator lights, and cables with protocol identification functions;
• Multi-port charging power strips, car chargers, wireless charging pads, desktop charging docks;
• USB docking stations and hubs with charging functions.
Among them, cables with E-Marker or other electronic functions cannot be treated only as ordinary passive cables; whether they are subject to TR CU 020/2011 and whether they need to apply for a separate certificate shall be confirmed in combination with their product structure, independent use, customs or product classification, and the exclusion scope in the annex of this regulation.
Situations That Do Not Require Separate Compliance
Several types of products do not require separate compliance assessment for this regulation:
• Pure passive charging cables: that is, ordinary charging cables without chips, indicator lights or other active components inside. If they are sold as a set accessory of the charger, they will be assessed together with the whole machine, and no separate application is required;
• Internal parts that are not sold independently: such as plugs, USB female sockets, adapters and other pure parts. If they are installed in finished products and not sold separately, they do not need to comply separately;
• Whether TR CU 020/2011 is not applicable shall be checked item by item against the explicit exclusion scope listed in Article 1 and Annex 1 of this regulation, as well as whether the product is subject to other special systems according to law;
• Low product power, small size or low voltage are not general exemption bases in themselves, and cannot be judged as inapplicable on their own.
3-Step Self-Inspection Method for Boundary Products
If your product is just in the fuzzy zone, you can use these three steps for preliminary screening:
Step 1: Check whether there is an active electronic circuit in the product — that is, whether there are chips, indicator lights, control modules, etc. that need power to work. Pure wires and pure metal structures usually do not belong to active circuits;
Step 2: Check whether the product is placed on the market as an independent product — separate packaging and separate sale are factors that need key attention, but applicability cannot be directly determined only by whether it is sold independently;
Step 3: Check whether the product will generate electromagnetic interference during intended use, or whether its function will be affected by external interference — this is one of the core considerations for TR CU 020/2011 to judge applicability.
These three steps can only be used as preliminary screening. In the end, it shall still be confirmed in accordance with Article 1, Annex 1 of TR CU 020/2011, the intended use of the product and applicable standards. It cannot be automatically assumed that it is “assessed with the main product” just because it is an accessory or not sold independently.
Common Misconceptions About the Scope of Application
Regarding who needs to do it and who doesn’t, there are several high-frequency wrong cognitions that must be avoided:
1. Only chargers plugged into alternating current need to be done? Wrong. As long as charging products with active circuits may be applicable, such as car chargers plugged into cigarette lighters and wireless charging pads that work by electromagnetic induction, all need to be confirmed in combination with specific products.
2. Charging cables are accessories and do not need compliance? Not necessarily. Cables with E-Marker or other electronic functions cannot be treated as ordinary passive cables just because they are accessories. It shall be judged whether they are applicable and whether they need to apply for a separate certificate in combination with their product structure, independent use, product classification and the exclusion scope of the regulation annex.
3. Low-power chargers do not need to be done? Wrong. This regulation has no general power exemption line. It is not that 5W or 10W low-power chargers do not need to be done, but are judged according to the interference risk of the product. Even if the power is small, if there is an interference risk, it needs to comply.
4. Plugs and charging ports sold separately need to be done? Usually not. Pure passive parts usually do not belong to the object of this regulation, but they shall still be confirmed in combination with product attributes and applicable scope, not just depending on whether they are sold separately.
Core Requirements: Two Types of Electromagnetic Compatibility Rules
The core requirements of TR CU 020/2011 can be divided into two categories, simply put, “do not disturb others, and do not be disturbed by others”.
Electromagnetic Emission Requirements: Do Not Interfere With Other Devices
This type of requirement controls that the interference generated by the product itself cannot exceed the standard, and the core assessment is in two dimensions:
• Conducted emission: interference propagates along wires such as power cords and charging cables. For example, a charger on the same power strip interferes with the router, causing WiFi to slow down, which is a typical excessive conducted emission.
• Radiated emission: interference spreads outward through the air. For example, a buzzing noise when a charger is close to a radio is a manifestation of excessive radiated emission.
The common reasons for exceeding the standard of charging products are also very clear: the switching frequency of fast charging products is generally higher. If the shielding structure is poorly made and the filter components are insufficient, it is easy to exceed the limit value.
Electromagnetic Immunity Requirements: Not Affected by External Interference
This type of requirement controls whether the product can meet the functions required for normal use when encountering external interference. The immunity test items, levels and performance criteria are not completely uniform for all charging products, but shall be determined according to applicable product standards, port types and intended use environments.
Common test items may include:
• Electrostatic discharge immunity: for example, when the human body with static electricity touches the charging port or the charger shell in winter, check whether the product meets the performance requirements specified in the corresponding standard;
• Radiated immunity: for example, in a strong electromagnetic field environment, check whether the functions of the charger and the charged device meet the corresponding criteria;
• Conducted immunity: for example, when there are clutter in the power grid, check whether the product output and functional performance are within the range permitted by the standard;
• Surge immunity: for example, when a high-voltage pulse occurs on the power supply side, check whether the product meets the requirements of the corresponding port and test level.
Whether temporary performance degradation is allowed, whether automatic recovery is required, and whether damage is prohibited shall be subject to the performance criteria of the corresponding test standard. Surge test is not automatically applicable to every type of product and every port.
If the immunity is not up to standard, common manifestations are phone screen flickering during charging, sudden slowdown of fast charging, and the chip of the charging port is easily damaged by static electricity.
Dimensions for Judging the Strictness of Requirements
Many people will ask: Are the limit values of this regulation unified? The answer is that there is no general unified limit value, but it is determined item by item according to product type, applicable standards, intended electromagnetic environment, ports and operating frequency bands.
Industrial environments often have higher requirements for product immunity, because there are more and more complex interferences in industrial sites; but the emission limit cannot be simply summarized as necessarily stricter or looser than consumer-grade. Products with data transmission functions and wireless power supply functions cannot be automatically considered to have stricter all EMC items, but shall be judged according to corresponding product standards.
Multi-port fast chargers require special attention to representative working conditions. It is not allowed to only select the single-port output state that is easiest to pass, but shall cover the working modes, ports and loads that can represent normal use and may have the most unfavorable emission and immunity performance in accordance with applicable standards.
Relationship With Other EAC Regulations
TR CU 020/2011 is not isolated. It has a parallel relationship with other EAC technical regulations. Charging products often need to comply with multiple regulations at the same time.
Relationship With Low Voltage Safety Regulation (TR CU 004/2011)
These are the two most commonly encountered regulations for charging products. They are parallel requirements, and most wall chargers and power adapters need to comply with both. Their division of labor is completely different: TR CU 004/2011 is in charge of personal safety, such as whether it will cause electric shock or fire; while TR CU 020/2011 is in charge of electromagnetic interference. A common misconception is that “if you have done safety certification, you don’t need to do EMC”, which is completely wrong. The two cannot replace each other and need to be complied with separately.
Other Commonly Involved Requirements
In addition to 004 and 020, different charging products may also involve other requirements:
• Products with wireless transmission functions, such as charging docks with Bluetooth and smart chargers with WiFi, may also involve the EAEU unified list or import notification, radio frequency use license, and member state communication regulatory requirements in addition to EMC. The specific requirements depend on the wireless module, frequency band and sales country;
• For products containing batteries, such as power banks with built-in cables and wireless chargers with batteries, whether TR EAEU 037/2016 or other requirements are applicable shall be confirmed according to product category, use and rules of the sales country, and cannot be generally understood as having to comply with “battery-related EAC regulations”;
• For charging modules integrated inside the car, such as the USB charging port that comes with the car’s original factory, it shall be judged according to whether it is placed on the market as a whole vehicle component or an independent after-sales product, the applicable scope of vehicle regulations and the specific certification path. It may involve TR CU 018/2011 and related UNECE requirements; whether TR CU 020/2011 is applicable shall also be confirmed case by case according to its scope and exclusion clauses.
Correct Understanding of the EAC Mark
Many people have misunderstandings about the EAC mark. It should be clarified here: EAC is the unified compliance mark of the Eurasian Economic Union, and the mark itself will not indicate which specific regulation it complies with. The EAC mark affixed to the product means that it complies with all applicable EAC technical regulations. Don’t think that a product with an EAC mark must be compliant — real compliance needs to match valid certification documents, and the structure and parameters of the actual product must be exactly the same as those in the documents. Otherwise, affixing the EAC mark without permission is a violation.
Conformity Assessment and Handling Process
Products that meet the requirements need to pass conformity assessment before they can be legally marketed. As far as TR CU 020/2011 itself is concerned, conformity confirmation adopts a declaration of conformity, that is, DoC, rather than the mandatory certification CoC under this regulation.
Core Requirements for Declaration of Conformity
The declaration of conformity for TR CU 020/2011 needs to be handled by selecting applicable declaration schemes such as 1d, 2d, 3d, 4d or 6d according to the product and evidence conditions. Different schemes have different requirements for technical documents, sample testing and the participation of accredited laboratories.
If the product is also applicable to other EAEU technical regulations, it shall also be checked separately whether those regulations require a certificate of conformity. The certification requirements that may exist in other regulations cannot be expressed as the CoC mode of TR CU 020/2011 itself.
Basic Requirements for Application
When handling the TR CU 020/2011 declaration of conformity, there are several basic thresholds:
• The applicant must be a legal person registered within the territory of the Eurasian Economic Union, and overseas manufacturers cannot apply directly;
• Overseas manufacturers must designate an authorized representative within the territory of the Eurasian Union to bear the legal responsibilities related to compliance;
• The applicant shall prepare evidence in accordance with the selected declaration scheme. For schemes requiring the participation of accredited laboratories, laboratories included in the unified list of EAEU accredited laboratories shall be used; the evidence composition of other schemes and the availability of overseas reports shall be confirmed in accordance with the scheme and registration requirements.
Validity Period and Supervision Requirements
The maximum validity period of the batch conformity declaration of TR CU 020/2011 is 5 years. The declaration for a single batch of products applies to the batch of products identified in the declaration.
Even if the product is still within the validity period of the declaration, it does not mean that the design, components or parameters can be changed at will. The applicant is still responsible for the product’s continuous compliance with the declared requirements.
5-Step Process for Compliance Handling
For charging products, the basic process for handling TR CU 020/2011 compliance can be divided into five steps:
Step 1: First confirm whether the product is within the applicable scope and the corresponding declaration of conformity scheme;
Step 2: Prepare tests and other conformity evidence in accordance with the selected declaration scheme. For schemes requiring the participation of accredited laboratories, send qualified test samples to accredited laboratories included in the EAEU unified list;
Step 3: Sort out complete technical documents and qualified operation documents. Operation documents shall be provided in Russian; if required by the laws of the member state of sale, the national language of that member state shall also be used;
Step 4: Register the declaration of conformity in the official system through the authorized representative within Eurasia;
Step 5: After completing the declaration, affix the EAC mark at the appropriate position on the product, packaging and/or accompanying documents in accordance with the unified marking rules, and then put it on the market for sale.
Necessary Contents of Technical Documents
Compliant technical documents are the core inspection items during spot checks, and must include the following contents:
• Basic product information: model, power, electrical parameters, interface type, etc.;
• Design materials: simplified circuit schematic diagram, list of key components;
• Test reports or other conformity evidence: shall be consistent with the selected declaration scheme;
• Labels and operation documents: product parameters, instructions for use and other contents shall be prepared in accordance with TR CU 020/2011 and the consumer information rules of the sales country respectively.
The EAC mark shall be affixed to the appropriate position on the product, packaging and/or accompanying documents in accordance with the unified marking rules, and cannot be simply understood as the instruction manual must have the mark printed on it.
These technical documents must be kept within the territory of the Eurasian Economic Union for at least 10 years, and shall be available for spot checks by regulatory authorities at any time.
Compliance Self-Inspection and Pitfall Avoidance Guide
After understanding the basic requirements, let’s talk about some pitfalls that are easy to step on in actual operation, as well as how to self-inspect and avoid them.
Key Pitfall Avoidance Points for Testing and Documents
Many invalid compliance problems occur in the testing and document links. These points must be paid attention to:
• Testing shall be carried out in accordance with applicable EMC standards, covering working modes, ports, loads and auxiliary equipment that can represent normal use and may have the most unfavorable emission and immunity performance. It is not allowed to only test the mode that is easiest to pass;
• The test sample must be exactly the same as the final mass-produced product. It is not allowed to send specially optimized “golden samples” for testing. Otherwise, if the comparison is inconsistent during spot checks, it will be directly judged as non-compliant;
• There are strict requirements for the coverage of series models. If the motherboard, power supply scheme, power, or interface changes, re-assessment is required, and new models cannot be casually added to the original certificate;
• The cables, adapters and auxiliary equipment used in the test configuration shall be recorded and controlled in accordance with applicable standards, especially when they may affect the results.
Method for Authenticity Inquiry of Compliance Certificates
Whether it is a compliance certificate handled by yourself or provided by a supplier, you can verify the information of the TR CU 020/2011 declaration of conformity through the EAEU Unified Conformity Certificate Register. When inquiring, focus on:
First, whether the declaration clearly includes the regulation TR CU 020/2011;
Second, whether the registration number, status, applicant, manufacturer and product identification information of the declaration match the actually sold product;
Third, whether the declaration is within the validity period.
If no record is found, it cannot be immediately concluded that it is a fake certificate. You should first check the registration number and search conditions, and confirm with the registration authority or authorized representative. Even if there is a registration record, it shall be cross-checked with the actual product model and technical documents.
5 Common Compliance Pitfalls for Charging Products
For charging products in the Eurasian market, these pitfalls are the most frequent and must be avoided:
1. Only completed TR CU 004/2011 low voltage safety regulation, missed TR CU 020/2011 EMC regulation, resulting in customs clearance detention;
2. Directly using CE-EMC or other overseas test reports to replace the conformity evidence required by TR CU 020/2011, resulting in insufficient basis for the declaration;
3. The fast charger only tested the ordinary 5V charging mode, and did not cover the most unfavorable working conditions such as maximum power in accordance with applicable standards, resulting in exceeding the standard during spot checks;
4. Cables with E-Marker or other electronic functions are treated as ordinary accessories and missed, and the applicability is not confirmed in combination with product structure, use and the exclusion scope of the regulation, resulting in the detention of the whole batch of goods;
5. The coverage scope of series models is applied too large, and the actually sold models are not within the coverage scope, and are judged as non-compliant.
Entry-Level Simple Self-Inspection Method
If there is no laboratory condition, you can also use these simple methods for preliminary judgment:
• Check the mark: the product has a clear EAC mark, and the supplier can provide certification documents marked with compliance with TR CU 020/2011;
• Check the design: products with metal shielding structure for chargers and shielding layers for charging cables are more likely to pass EMC tests;
• Actual test experience: during normal use, it will not cause nearby WiFi lag, phone screen flickering, or obvious noise from the radio.
However, it should be noted that these are only preliminary references. The final compliance shall be subject to formal evidence that meets the applicable declaration scheme and applicable standards.
Compliance Judgment for Product Changes
Many people think that as long as the certificate is within the validity period, there is no problem no matter how the product is changed. This is a common misconception. If the product has undergone key changes that may affect EMC, even if the declaration is still within the validity period, the compliance needs to be re-assessed.
• Changes that usually require key re-assessment: replacement of motherboard or power supply scheme, replacement of filter components, power increase, interface addition, charging protocol change, change of shielding structure or material, etc. These may directly affect the electromagnetic compatibility performance;
• Changes that usually have less impact: changes that usually do not affect electromagnetic compatibility, such as color, can maintain the original conformity basis after confirmation by the manufacturer’s written change impact analysis.
Any change of components, materials, structures or software shall be assessed for its impact on the declared conformity. If it may affect EMC performance, product identification or applicable standards, supplementary tests shall be carried out, technical documents shall be updated, and the declaration shall be re-handled as appropriate.
High-Risk Points of Market Spot Checks
When customs and market regulatory authorities conduct spot checks, several points are key inspection objects, and preparations must be made in advance:
• The parameters on the product label are inconsistent with those in the compliance certificate documents, for example, the label is marked 65W, but the certificate only has 45W;
• The structure and key components of the actual mass-produced product are different from the test sample, for example, brand-name filter capacitors were used during testing, but cheap ones were replaced during mass production;
• Lack of valid technical documents, or no contact information of the local authorized representative;
• Cables with E-Marker or other electronic functions have not been judged for applicability, or the required certification documents are missing;
• The product model and parameters marked on the e-commerce page are inconsistent with those in the compliance certificate.
Summary
After reading this content, you should be able to independently judge these 5 things related to charging products:
First, through preliminary screening and combined with product use, structure and regulation annexes, judge whether your charging products need to comply with TR CU 020/2011;
Second, understand that TR CU 020/2011 itself adopts a declaration of conformity, and know that if the product is also applicable to other regulations, the corresponding conformity assessment requirements need to be confirmed separately;
Third, understand the key information of the EAC compliance certificate, and know how to use the unified register to verify the declaration registration information;
Fourth, identify 5 types of common compliance pitfalls to avoid the risks of customs clearance and market spot checks;
Fifth, use simple methods to preliminarily judge the possibility of a product’s EMC compliance.
As a core access requirement for charging products in the Eurasian market, TR CU 020/2011 seems professional, but in fact, its core logic is to control electromagnetic interference within a reasonable range, which not only protects the user’s use experience, but also maintains the normal order of the market. As long as the applicability assessment is done in advance and evidence is prepared in accordance with the corresponding declaration scheme, the compliance requirements can be met more steadily.