Tendering under EN/IEC: the compliance evidence a European bid must carry
A European tender requires you to prove compliance with EN and IEC standards through documented evidence, not just a statement that you comply. The core evidence a bid must carry is the EU Declaration of Conformity and CE marking for any equipment placed on the EU market, type test certificates to the relevant harmonised EN/IEC standard, material certificates to EN 10204 (typically type 3.1, sometimes 3.2), and the technical documentation that backs each claim. EN standards are the European versions of IEC standards (often identical, with national or European deviations), and a harmonised EN listed in the Official Journal of the EU gives a presumption of conformity with the relevant directive or regulation. The practical task in any EU bid is to attach the right certificate to the right clause: a compliance matrix that maps each requirement to its EN/IEC reference and the document that evidences it.
What is the difference between EN and IEC standards?
EN standards are the European versions of IEC standards, published by CENELEC, and they are often technically identical to the IEC original, which is why many appear as EN IEC 6xxxx. IEC is the international baseline written by the International Electrotechnical Commission; EN is what an EU buyer and an EU contract actually cite. Two differences matter on a bid. First, some EN standards add common modifications or national deviations to the IEC text, so the EN can be stricter than the IEC version you may have tested to. Second, only a harmonised EN, one listed in the Official Journal of the EU, confers a presumption of conformity with an EU directive. Practically: cite the EN reference in your compliance matrix, and check whether the EN adds anything to the IEC version behind your certificate.
What compliance evidence must a European bid carry?
A European bid must carry documented evidence for every compliance claim, not just a statement of intent. The core set is: CE marking and the EU Declaration of Conformity for any equipment placed on the EU market; type test certificates to the governing EN/IEC standard for switchgear, assemblies and transformers; material certificates to EN 10204 (commonly type 3.1, sometimes 3.2) for steelwork, enclosures and pressure parts; the technical documentation that underpins each claim; and, for the specific items built for the contract, factory acceptance test (FAT) records against an agreed inspection and test plan (ITP). For construction products in scope, the Construction Products Regulation adds a Declaration of Performance (DoP). The table below sets out what each piece of evidence proves and where it is required.
What is CE marking and the EU Declaration of Conformity?
CE marking is the manufacturer's declaration that a product meets every EU directive or regulation that applies to it, and the EU Declaration of Conformity is the signed document that states it. For electrical equipment, the common directives are the Low Voltage Directive (2014/35/EU) and the EMC Directive (2014/30/EU); machinery falls under the Machinery Directive (2006/42/EC), which is replaced by the Machinery Regulation (EU) 2023/1230 from 20 January 2027. Applying a harmonised standard, an EN listed in the Official Journal of the EU, gives a presumption of conformity with the directive it covers. For a tender, the returnable evidence is the Declaration of Conformity plus the list of harmonised EN standards applied, not the CE logo alone.
Which EN/IEC standards do power and electrical bids cite?
European power and electrical bids cite the EN versions of the core IEC equipment standards. Low-voltage switchgear and controlgear assemblies are judged against EN IEC 61439; high-voltage switchgear against EN IEC 62271; power transformers against EN IEC 60076; substation protection and communications against EN IEC 61850 and the IEC 60255 relay series; earthing and high-voltage installations against EN 50522 and EN 61936-1; and structural and civil works against the Eurocodes (EN 1990 to EN 1999), with steel execution under EN 1090. For each, the evidence is the relevant type test or routine test certificate, plus the design and verification records. The table below pairs the common scope items with their standard and the evidence a bid attaches.
What is EN 10204 and which certificate type does a tender ask for?
EN 10204 defines the types of inspection document a metallic product can be supplied with, and a tender specifies which type it requires. Type 2.1 is a declaration of compliance with the order with no test results; type 2.2 is a test report from non-specific testing; type 3.1 is an inspection certificate based on specific testing of the actual material, endorsed by a manufacturer's representative independent of the manufacturing department; type 3.2 adds countersignature by an independent third party or the purchaser's agent. The higher the type, the more independent the validation, and the longer the lead time and cost. Supplying a 3.1 where the specification demands a 3.2 is a non-conformance, so the certificate type is something to check clause by clause. The table below summarises the four types.
How does this show up in a compliance check?
Every standard and certificate above becomes a row in the compliance matrix: the requirement, the EN/IEC reference it is judged against, your compliance position, and the evidence document that proves it. A missing or wrong-type certificate is not a footnote; it reads as a non-conformance to the evaluator, or it forces a clarification under time pressure. This is the document-intensive work Elora Grid is built for: hand it the specification, the standards list and your certificate pack, and it returns a compliance matrix that maps each clause to its EN/IEC reference and the evidence document, with every line cited to its source and page. The engineering judgment, whether a deviation is acceptable and how to qualify it, stays with your team; the tool removes the matching and cross-referencing.
Compliance evidence a European bid carries
| Evidence | What it proves | Where it is required |
|---|---|---|
| CE marking + EU Declaration of Conformity | The product meets all applicable EU directives and regulations | Any equipment placed on the EU market (LVD, EMC, Machinery and similar) |
| Type test certificate (to EN/IEC) | The equipment design passed the type tests in the governing standard | Switchgear, assemblies, transformers and protection equipment |
| EN 10204 material certificate | The actual material supplied meets the specified grade and tests | Steelwork, enclosures, busbar, pressure parts and fasteners |
| Technical documentation (technical file) | The basis for the conformity claim: calculations, test reports, drawings | Held by the manufacturer; sampled by the evaluator or a notified body |
| FAT and ITP records | The specific item built for this contract was inspected and tested | Assembled equipment before delivery, against an agreed inspection and test plan |
Standards a European power/electrical bid commonly cites
| Equipment / scope | EN (IEC) standard | Typical evidence |
|---|---|---|
| Low-voltage switchgear and controlgear assemblies | EN IEC 61439 | Type test certificate plus routine test report |
| High-voltage switchgear | EN IEC 62271 | Type test certificate to the rated voltage and short-circuit rating |
| Power transformers | EN IEC 60076 | Routine and type test report (temperature-rise and impulse tests) |
| Substation protection and communications | EN IEC 61850 and the IEC 60255 relay series | Configuration records and relay type test certificates |
| Earthing and high-voltage installations | EN 50522 and EN 61936-1 | Earthing design and verification records |
| Structural steel and civil works | The Eurocodes (EN 1990 to EN 1999) | Design calculations and EN 1090 execution evidence |
EN 10204 inspection certificate types
| Type | Name | Testing basis | Who validates it |
|---|---|---|---|
| 2.1 | Declaration of compliance with the order | No test results stated | The manufacturer |
| 2.2 | Test report | Non-specific testing (not the actual items) | The manufacturer |
| 3.1 | Inspection certificate 3.1 | Specific testing on the supplied material | A manufacturer's representative independent of the manufacturing department |
| 3.2 | Inspection certificate 3.2 | Specific testing on the supplied material | The manufacturer's representative plus the purchaser's agent or a notified third party |
- 01Read the specification's standards list first. List every EN, IEC and Eurocode the specification cites, plus the certificate type it demands (for example EN 10204 3.1 or 3.2). The standards list defines the evidence you must produce.
- 02Map each requirement to its standard. In your compliance matrix, give every requirement a row and record the EN/IEC reference it is judged against, so each clause has a named standard behind it.
- 03Attach the evidence document to each clause. Against each row, cite the specific document that proves compliance: the EU Declaration of Conformity, a type test certificate, a material certificate or a test report. A 'comply' with no document is not evidence.
- 04Confirm CE marking and the Declaration of Conformity. For any equipment placed on the EU market, confirm the product carries CE marking and that you can supply the signed EU Declaration of Conformity listing the directives and harmonised standards applied.
- 05Check the certificate type matches the spec. Where the specification asks for EN 10204 3.2, a 3.1 certificate is a non-conformance. Verify each material certificate is the type the contract requires before you submit.
- 06Raise gaps as clarifications, not silent gaps. Where a demanded standard, test or certificate type cannot be met, record it as a departure or clarification rather than leaving the matrix to imply full compliance.
Common questions
Do EN and IEC standards say the same thing?
Often, but not always. EN standards are the European (CENELEC) adoptions of IEC standards and are frequently technically identical, which is why many are published as EN IEC 6xxxx. Some carry common modifications or national deviations, and only a harmonised EN listed in the Official Journal of the EU gives a presumption of conformity with an EU directive. For a European tender, cite the EN reference, not the bare IEC number.
Is CE marking enough to prove compliance in a tender?
No. CE marking is the manufacturer's declaration that a product meets the applicable EU directives, and it is necessary for equipment placed on the EU market, but a tender usually wants the evidence behind it. Expect to supply the signed EU Declaration of Conformity, the list of harmonised standards applied, and type test or material certificates for the specific equipment. CE marking is the claim; the certificates are the proof.
What does EN 10204 3.1 mean on a material certificate?
An EN 10204 type 3.1 certificate is an inspection certificate based on specific testing of the actual material supplied, endorsed by a manufacturer's representative who is independent of the manufacturing department. A type 3.2 certificate adds validation by an independent third party or the purchaser's agent. A tender specifies which type each material needs, and supplying a 3.1 where 3.2 is required is a non-conformance.
Does an IEC type test certificate satisfy a European tender?
Usually yes, where the EN is identical to the IEC, because most European power-equipment standards are published as EN IEC with the same technical content. Confirm two things: that the EN version does not add a deviation the certificate misses, and that the certificate covers the rated values (voltage, current, short-circuit) the specification demands. Cite the EN reference in your compliance matrix even when the test was to IEC.
What changes with the EU Machinery Regulation in 2027?
The Machinery Regulation (EU) 2023/1230 replaces the Machinery Directive 2006/42/EC from 20 January 2027. As a regulation it applies directly across the EU without national transposition, and it updates conformity assessment, technical documentation and digital instruction requirements. For machinery delivered around that date, confirm which regime applies on the placing-on-market date, and that your Declaration of Conformity references the correct legislation.
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