When we start a hardware design for a U.S product, one of my first questions is whether it might ever ship to Europe. On one project the answer was “probably, eventually.” So we built the power stage to run on both U.S. and European mains from day one. When Europe did come up, the electrical design didn’t need a second revision.
Many companies come to us later, with the product already built and one question: “Can we sell what we already build, or will we need to redesign it?” Usually it’s less work than they fear. If the hardware wasn’t designed with Europe in mind, that’s where the surprises tend to be. If it was, most of the remaining work isn’t hardware. It’s working out which rules apply, proving you meet them, and getting the paperwork and the EU-side responsibilities sorted. And CE marking isn’t a certificate someone hands you. It’s your own declaration that the product meets the EU rules that apply to it, backed by evidence you keep.
Be precise about what you’re shipping
It sounds obvious, but this is where I see the most expensive mistakes. A controller board you sell to OEMs, a standalone instrument, and a complete machine are different compliance problems. A component can carry obligations of its own, depending on what it is and which rules cover it, so assess it separately from the finished system it goes into. Sell the finished machine, and you own the assessment of the whole thing, including how it’s installed and used.
Machinery law also has a category called partly completed machinery. It has a specific legal meaning: an assembly that is almost machinery but can’t perform a specific application on its own, like a drive system waiting to be built into a machine. Not every subsystem qualifies, so check the definition rather than assuming. If yours does, it doesn’t get a CE mark under the machinery legislation. It ships with a Declaration of Incorporation and assembly instructions instead. Other legislation, such as EMC, may still require CE marking for it. Before anyone opens a standard, answer the plain questions. Who installs, runs and services it? Where does it operate? What does it plug into? What will people reasonably do with it that you didn’t intend?
Work out which rules apply
There’s no generic CE checklist for industrial products. What applies follows from what the product is and does, and three or four pieces often stack on one product.
| Legislation | Usually relevant when |
|---|---|
| Machinery Directive | The product meets the definition of machinery or partly completed machinery |
| Low Voltage Directive | Electrical equipment rated 50-1,000 V AC or 75-1,500 V DC |
| EMC Directive | Equipment can emit or be disturbed by electromagnetic interference |
| Radio Equipment Directive | The finished product qualifies as radio equipment |
| RoHS | Electrical and electronic equipment in its scope |
| ATEX / Pressure Equipment | Explosive atmospheres or pressurized equipment are involved |
A couple of overlaps can trip people up. For machinery, electrical hazards are handled under the machinery rules, though the LVD’s safety objectives still apply. And if the finished product qualifies as radio equipment, RED covers its safety and EMC requirements in place of the LVD and EMC Directive. Adding a Bluetooth or Wi-Fi module is usually what prompts the question of whether it does. RED’s cybersecurity requirements are narrower still and apply only to certain categories of radio equipment.
Outside CE marking, WEEE (electronics take-back) and REACH (substances in your materials) also apply to many products and are easy to miss. Machinery placed on the market from January 20th, 2027 falls under the new Machinery Regulation. And if your product has digital elements, the Cyber Resilience Act is already relevant to you. Its vulnerability and severe-incident reporting obligations have applied since September 2026, and its main requirements apply from December 11th, 2027. I’ll cover both in follow-up posts.
What your U.S. paperwork is worth
Usually quite a bit, though rarely as much as people hope. UL or CSA reports, FCC reports, schematics, risk assessments and supplier declarations all get reused. None of them proves EU conformity on its own. We find the same two gaps on almost every project. The first is EMC immunity. FCC Part 15 covers emissions, but the EU also expects immunity, typically to EN 61000-6-2 for industrial environments. If you’ve never run ESD, burst, surge and radiated immunity tests, plan for them. That’s often where firmware issues show up: watchdogs that don’t recover, readings that drift under RF, comms that lock up after a burst.
The second is machine electrical design. Panels built to NFPA 79 and UL 508A carry a lot over, but the EU reference is EN 60204-1. Wire colors, protective bonding, emergency stop behavior and disconnecting means differ in ways that matter. It’s worth budgeting for a proper review.
Do you need a redesign?
Sometimes, and the only reliable way to find out is a gap assessment. People often ask whether a low-voltage product is safe from changes. Voltage matters, but it doesn’t settle anything. A 24 V DC controller can still fail immunity testing or fall short on machinery safety. A 480 V system with solid insulation, protective earth, overcurrent protection and clearances may need almost nothing. The real question is whether this product, as you’ll ship it and where it’ll run, meets the rules that apply.
The supply deserves its own look. A design built around 120 V, 60 Hz may not run directly on 230 V, 50 Hz. A universal-input supply or an alternate configuration may already cover it, but motors, transformers, PSUs and protective devices all need checking, and industrial supplies vary further.
The cheapest fix is the one you design in. On the project I mentioned previously, a universal-input supply regulates the incoming AC down to the internal rails, so the electronics see the same voltage at 120 V or 230 V. We designed the input stage, with power factor correction and filtering, with harmonic current limits in mind at both 50 and 60 Hz. Whether a given harmonics standard applies depends on the equipment and its input current; EN IEC 61000-3-2, for example, covers equipment up to 16 A per phase. PFC helps you get there, but only testing against the applicable limits shows compliance. Fans and other AC loads run at either frequency, and the fusing and protective devices are rated for the whole input range, with the rating label and manual to match.
It cost a little more in parts up front; it saved a board respin, a second round of testing, and two versions of the product to support. For the assessment itself, start with product-specific standards where they exist, then horizontal ones like EN ISO 12100 for risk assessment, EN 60204-1 for machine electrical equipment, and the EN 61000-6 series for EMC. Harmonized standards are voluntary, but applying one cited in the Official Journal gives you a presumption of conformity for the requirements it covers. Check you’re on the cited edition. And, of course, test the product as it ships. Swap the cable, enclosure or PSU afterward and you may have invalidated the results.
Someone in the EU has to answer for it
This is the requirement U.S. companies most often learn about from a distributor or a customs agent. Under the Market Surveillance Regulation (EU) 2019/1020, products under legislation like the Machinery, LVD, EMC, RED and RoHS rules generally need an economic operator established in the EU. The options aren’t interchangeable. For a manufacturer outside the EU, it’s usually the EU importer, or an authorized representative you appoint with a written mandate. A fulfilment service provider counts only when no other eligible operator is established in the EU. That operator’s name and contact details must appear on the product, its packaging, the parcel or an accompanying document. They must be able to provide your Declaration of Conformity and technical documentation to authorities, and cooperate if there’s a problem in the field.
If a European distributor imports your product, they’re the importer and may fill this role. If there’s no EU importer, for example because you sell direct, you’ll likely need an authorized representative. Decide early and put it in writing. The other practical cost is language, and the rules depend on the legislation and the countries you sell into. For machinery, instructions generally have to be in the official language or languages of the Member State where it’s placed on the market or put into service. Check each target country before you budget translations.
Documentation and the declaration
Write the technical file for the person who might one day question your product: a market surveillance authority. It typically covers the product description and intended use, drawings and BOM, the risk assessment, the standards applied, test reports, supplier declarations, labels and instructions, and how each gap was closed. For RoHS, EN IEC 63000 is the harmonized standard for that documentation. Start chasing supplier material data early.
Then you sign the EU Declaration of Conformity and apply the CE mark. A notified body is only involved when the legislation and conformity route require one. For most industrial equipment, you self-assess. When the design, components or intended use change, reassess. The file has to match what you’re building today.
Where I’d start
I’d hold off on test lab quotes and start with a gap assessment of the product as you’ll actually ship it. Before you spend real money, it tells you whether your design and evidence will carry you, or which changes you need.
If you can answer these, you’re ready for one:
- What exactly are we placing on the EU market?
- Which EU legislation applies to it?
- Which standards fit, and are we on the cited editions?
- Where does our U.S. evidence fall short?
- Who is our EU economic operator?
- Who signs the declaration and keeps the file current?
In my experience, most U.S. industrial products make it to Europe without major surgery. The painful projects are usually the ones that left compliance until the design was already frozen.
If you’re weighing a move into Europe, a gap assessment is where we usually start with clients. Get in touch and we can talk through your product.