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CE Certification for Power Supply Products: A Complete Compliance Guide
Edit: ANCI 2026-05-08 285
Any power supply product — whether a switching power supply, AC/DC adapter, charger, or UPS — must carry the CE mark before it can be legally placed on the European market. CE certification is not a single test; it requires demonstrating compliance with multiple EU Directives covering electrical safety, electromagnetic compatibility, energy efficiency, and hazardous substance restrictions. This guide walks through the applicable directives, key standards, testing scope, and the most common reasons applications get held up.
What Does CE Certification Involve?
CE stands for Conformité Européenne — "European Conformity." It is a mandatory mark for products sold within the European Economic Area (EEA), signifying that the product meets the essential requirements of all applicable EU Directives. For power supply products, four directives are typically in scope:
Low Voltage Directive (LVD) — 2014/35/EU
Covers electrical equipment operating between 50–1000 V AC or 75–1500 V DC. Sets essential safety requirements for design and construction.
Electromagnetic Compatibility Directive (EMCD) — 2014/30/EU
Requires that equipment neither generates excessive electromagnetic disturbance nor is unduly affected by external interference.
Ecodesign Directive (ErP) — 2009/125/EC
Sets mandatory energy efficiency limits for external power supplies, including no-load power consumption and average active efficiency tiers.
RoHS Directive — 2011/65/EU
Restricts the use of lead, mercury, cadmium, and other hazardous substances in electrical and electronic equipment.
A product must satisfy all applicable directives simultaneously before the CE mark can be legally affixed.
Field note: In a recent compliance review, a manufacturer had completed LVD and EMC testing but overlooked ErP requirements for their external adapters. The no-load power consumption exceeded the limit — a separate compliance gap that could have resulted in goods being held at EU customs.
Applicable Standards
The harmonised standards under each directive provide the technical detail for demonstrating compliance. Here are the most commonly applied standards for power supply products:
Safety (LVD)
- EN 62368-1 — Audio/video, information and communication technology equipment — Safety requirements. This is the current core standard, having replaced both EN 60950-1 and EN 60065.
- EN 61558 series — Safety of power transformers, power supply units, and similar products. Applies to standalone transformers and power supplies.
- EN 60335-1 — Safety of household and similar electrical appliances. Relevant when the power supply is integrated into a consumer appliance.
Electromagnetic Compatibility (EMC)
- EN 55032 — Electromagnetic compatibility of multimedia equipment — Emission requirements
- EN 55035 — Electromagnetic compatibility of multimedia equipment — Immunity requirements
- EN 61000-3-2 — Harmonic current emission limits for equipment drawing up to 16 A per phase
- EN 61000-3-3 — Voltage fluctuations and flicker limits
Energy Efficiency (ErP)
- EU 2019/1782 — Ecodesign requirements for external power supplies and chargers. Defines no-load power consumption limits and minimum average active efficiency levels.
Watch out: EN 62368-1 has fully superseded the older EN 60950-1. Applications referencing the obsolete standard will be rejected. Always verify the current standard edition before submitting documentation.
Key Test Categories
Testing for CE compliance falls into three broad areas:
Electrical Safety (LVD)
- Dielectric strength and insulation resistance — verifies isolation between primary and secondary circuits
- Temperature rise testing — monitors critical component temperatures under rated load over extended operation
- Abnormal conditions — output short circuit, overload, and single-component fault scenarios
- Mechanical robustness — drop tests, impact resistance, and enclosure rigidity
- Flammability — glow-wire or needle-flame tests on plastic enclosures and insulation materials
Electromagnetic Compatibility (EMC)
- Conducted emissions (150 kHz – 30 MHz) — measures disturbance fed back onto the mains supply
- Radiated emissions (30 MHz – 1 GHz or higher) — measures electromagnetic energy radiated into free space
- Harmonic current measurement — evaluates waveform distortion of the input current
- Immunity testing — ESD, surge, electrical fast transient/burst (EFT/B), and conducted immunity
Energy Efficiency (ErP)
- No-load power consumption — measured with no device connected to the output
- Average active efficiency — weighted average of conversion efficiency at 25%, 50%, 75%, and 100% load
In practice, conducted and radiated emissions are the most frequent failure points. Switching harmonics from power converters often fall squarely in the conducted emission band, making EMI filter design and PCB layout critical from the earliest design stages.
Application Process
Step 1 — Identify applicable directives and standards. Based on the product type, voltage rating, and intended use, determine which directives (LVD / EMCD / ErP / RoHS) and corresponding harmonised standards apply.
Step 2 — Compile technical documentation. Prepare product specifications, circuit schematics, PCB layouts, a BOM with safety-critical component details, label artwork, and user instructions.
Step 3 — Submit samples for testing. Send representative samples to an accredited laboratory for LVD safety, EMC, and ErP testing.
Step 4 — Review test reports. Once the lab issues reports, verify that all product details and measured values are accurate before proceeding.
Step 5 — Prepare the technical file. Assemble the complete technical documentation package, including test reports, risk assessments, and design drawings. This file must be retained for a minimum of 10 years after the product is placed on the market.
Step 6 — Issue the Declaration of Conformity and affix the CE mark. The manufacturer signs an EU Declaration of Conformity (DoC) and applies the CE mark to the product and packaging. The mark must be at least 5 mm tall, proportional, and clearly legible.
Field note: In a batch of adapter certification cases, several applications were delayed because the BOM listed incomplete information for safety-critical components — specifically, the optocoupler and Y-capacitor part numbers and supplier details were missing. This gap meant the safety report lacked traceability for key parts, requiring supplementary documentation. Cross-check critical component data before submission.
Common Reasons for Rejection
- Outdated standard references — citing superseded editions (e.g. EN 60950-1 instead of EN 62368-1) invalidates the report
- EMC test failures — conducted or radiated emissions exceeding limits, usually requiring filter redesign or PCB layout changes
- Unreported component changes — replacing safety-critical parts (fuses, optocouplers, Y-capacitors) after testing without updating the technical file
- Labelling and documentation gaps — improperly sized CE mark, missing manufacturer details, or no EU Authorised Representative identified
The overall timeline depends on three factors: sample readiness, number of test rounds (whether re-testing is needed after整改), and documentation completeness. Thorough pre-compliance testing before the formal submission is the most effective way to avoid unexpected delays.
Tip: Run preliminary scans on conducted emissions, radiated emissions, and temperature rise before the formal submission. These three items account for the majority of first-round failures.
Frequently Asked Questions
How much does CE certification cost for a power supply?
Costs vary with product complexity, the number of directives in scope, and the testing laboratory. A simple AC/DC adapter is at the lower end; a multi-output switching supply with high power ratings costs more. Contact an accredited testing provider for a quote based on your specific product configuration.
Does a CE certificate expire?
There is no fixed expiration date. However, the declaration remains valid only as long as the referenced standards are current and the product design has not changed materially. If a standard is revised or the product undergoes significant modifications (new topology, different critical components), a fresh assessment and updated documentation are required.
What is the difference between CE marking and CB certification?
CE is a mandatory self-declaration (for most power products) required for the EU market. CB is a voluntary international scheme under the IECEE that allows a single test report to be used for multiple national certifications. A CB report can support a CE application but does not replace it. Planning for both early in the product cycle is the most efficient approach.
Do I need an EU Authorised Representative?
Yes. Non-EU manufacturers must appoint an Authorised Representative based in the EU. This entity is responsible for holding the technical documentation and liaising with market surveillance authorities. Selling without one is a compliance violation.
Is RoHS part of CE?
RoHS is a separate directive within the CE framework that restricts hazardous substances in electrical and electronic equipment. Compliance is typically demonstrated through material test reports or supplier declarations. It is one of the components of the manufacturer's CE self-declaration.
Key Takeaways
CE certification for power supply products spans electrical safety, EMC, energy efficiency, and hazardous substance compliance — all of which must be satisfied simultaneously. Addressing these requirements during the design phase, rather than after prototyping, significantly reduces rework and delays.
Working with an experienced testing and compliance partner can help streamline the process. For product-specific guidance or a tailored testing proposal, reach out to Anci at net01@gtggroup.com.
This article was generated with AI assistance. Content is for informational purposes only and does not constitute legal or certification advice. Always refer to the latest official regulations.
Contact: net01@gtggroup.com
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