Iecee Cb Scheme Testing Laboratory Services

Scope and evidence must be confirmed before any paid tests or filings.

A CB test laboratory should be selected for the exact evidence route, not simply because it can run an IEC test. For an IECEE CB Scheme project, confirm the applicable standard and edition, the laboratory's accepted CBTL scope, the responsible NCB, the models and samples to be covered, the target-country national differences, and how existing reports or later design changes will be handled.

The practical objective is to leave the laboratory-booking stage with a written test plan that identifies what will be tested, on which representative samples, under which CB scope, and what evidence is expected at the end. A CB Test Certificate and its associated CB Test Report can support recognition and national certification, but they do not by themselves answer every target-market requirement.

Five decisions to lock before booking a CB laboratory

Standard route: identify the IEC or ISO/IEC standard, edition and amendments that the NCB/CBTL proposes to use for the product.
Scope route: verify that the laboratory is an IECEE-accepted CB Testing Laboratory (CBTL) for the relevant product category and standard, and identify the National Certification Body (NCB) responsible for the CB project.
Model route: define the exact models, variants, ratings, power supplies, accessories and factories that are intended to be represented by the evidence.
Market route: identify target countries early enough to decide whether applicable national differences should be evaluated in the initial campaign.
Evidence route: disclose existing CB certificates/reports, prior tests and planned design changes so the NCB/CBTL can decide what can be reused and what needs review or testing.

Testing matrix: questions that change the evidence plan

Question	What must be established	Why it changes the plan
What standard applies?	Standard number, edition, amendments and any relevant part standards.	A different edition or part can change construction requirements, tests and the usable report format.
Which models are in one family?	Common construction plus every safety-relevant difference between variants.	The laboratory may need a worst-case model, multiple configurations or additional clause testing.
Which markets matter?	Countries or certification destinations for which the CB evidence will be used.	National differences can create additional tests, component conditions or documentation needs.
What evidence already exists?	CBTC/CBTR references, test dates, standard editions and product configuration covered.	Existing data may reduce duplication, but reuse depends on identity, scope, currency and the NCB's technical judgment.
Where will tests be performed?	CBTL, approved customer testing facility arrangement where applicable, or other permitted test location.	The test location and responsible CBTL must fit IECEE procedures and be properly identified in the reporting chain.
Which components are safety-critical?	Critical parts, ratings, approvals and alternatives in the bill of materials.	Changing a critical component can affect construction review and trigger focused retesting.

How to check a CB test laboratory before sending samples

Do not treat a general laboratory accreditation or an ISO/IEC 17025 statement as proof that every requested test can be performed within the IECEE CB Scheme. Ask for the laboratory's current IECEE CBTL scope for the exact standard or product category and confirm which NCB will issue or take responsibility for the CB Test Certificate and report package.

Ask the CBTL to identify the exact standard, edition and TRF/test-report route proposed for the project.
Confirm whether all required tests are within its CB scope and how any permitted subcontracted or external testing would be controlled and reported.
Ask whether target-country national differences can be evaluated during the same campaign and which additional samples or configurations they require.
Request the sample plan before shipment, especially where destructive, abnormal-condition, endurance or component tests may consume samples.
Agree how failures, modifications during testing and retest decisions will be documented.

For a broader comparison of laboratory types, use the product testing lab guide. For general test-service planning outside the CB evidence route, see product testing services.

Sample planning: do not ship products until the coverage logic is agreed

There is no universal sample count for a CB project. The number and configuration of samples depend on the applicable standard, the tests to be performed, the product-family strategy, destructive test needs and the laboratory's sampling instructions. A useful pre-shipment map separates the representative production configuration from variants and spare/destructive samples.

Representative sample: the configuration intended to demonstrate the main construction and ratings.
Variant samples: only where differences cannot be assessed from documentation or one worst-case configuration.
Destructive-test reserve: spare units or parts where the test programme can permanently alter the sample.
Critical-component evidence: certificates, specifications and alternative-component details that support the construction review.

Before shipping, ask the laboratory to state which model is considered worst case for each relevant test group. A single "worst case" for temperature may not be the worst case for dielectric, abnormal-operation, mechanical or component-related tests.

Can an existing CB report be reused?

Possibly, but reuse should be treated as a technical decision rather than an automatic entitlement. Give the NCB/CBTL the complete previous CB package and a controlled comparison between the tested product and the current product. The review should cover at least the standard edition, model identity, safety-critical construction, ratings, critical components, factories and national differences already evaluated.

If the product and evidence are genuinely unchanged and still suitable for the intended recognition route, the existing data may be usable.
If the standard, design, components, model family or target differences have changed, a construction review and selected additional tests may be needed.
If the previous report is incomplete, untraceable or outside the needed CB scope, plan on new evidence rather than assuming the old report will be accepted.

The receiving NCB or authority can still have its own recognition conditions. Therefore, "CB report available" is not the same as "no retest will ever be required".

Failure and retest logic

A failed clause should produce a controlled technical loop: identify the failed configuration and clause, record the corrective change, assess what other clauses the change can affect, then agree the retest scope with the CBTL/NCB. Repeating only the originally failed measurement can be unsafe if the fix changes thermal behaviour, insulation, protective components, enclosure conditions, power characteristics or a safety-related control function.

Ask the laboratory to separate three outcomes in writing: the original failure, the engineering change made in response, and the set of tests or construction checks repeated after the change. This makes the final report easier to defend and reduces uncertainty when the evidence is later presented to another NCB.

Test-driven change-control map

Proposed change	Evidence risk	Safe action before release
Replace a safety-critical component	Ratings, certification conditions or abnormal/thermal performance may change.	Send the proposed substitute and its evidence to the NCB/CBTL for impact review before production release.
Change PCB layout, creepage/clearance or insulation system	Construction and dielectric assumptions may no longer match the tested sample.	Request construction review and clause-specific retest decision.
Change enclosure material, ventilation or mechanical structure	Fire, temperature, accessibility or mechanical tests may be affected.	Provide drawings/material data and obtain a documented impact decision.
Change power supply, input rating or output capability	Electrical stress, heating and abnormal-condition results may change.	Re-open the applicable electrical and thermal test matrix with the laboratory.
Add a model or option	The existing worst-case rationale may no longer cover the family.	Update the model-difference table and ask which additional sample or tests are required.
Add or move a factory	Certificate/report identification and production representation may need review.	Tell the NCB before relying on the existing package for the new factory arrangement.
Move to a newer standard edition or new target country	New clauses or national differences may create an evidence gap.	Run a gap assessment before claiming the previous report covers the new route.

What to send in the first laboratory enquiry

product description, ratings, intended use and all model/type references;
target countries and the national certifications or recognition routes being considered;
known applicable IEC/ISO/IEC standards and editions, if already identified;
schematics, PCB/layout information, drawings, user instructions and proposed markings;
bill of materials with safety-critical components and available component certificates;
model-difference matrix, accessories, power supplies and factory list;
existing CB Test Certificates, CB Test Reports and other relevant test evidence;
planned engineering changes and any known previous test failures;
requested timing and sample-availability constraints, without assuming the laboratory can confirm a fixed completion date before technical review.

The laboratory should then be able to return a more meaningful scope, sample request and test plan instead of a quotation based only on a product name.

Where this testing page stops

This page owns the testing-evidence decisions: CBTL scope, test matrix, sample logic, report reuse, failures, retesting and change control. The complete certification/registration workflow belongs elsewhere. If you need the end-to-end certification process rather than the laboratory evidence plan, use product certification services. If the question is how the CB route fits a wider country portfolio, use global product compliance and market access services.

Official sources to verify before the project starts

IECEE — official system website: current CB Scheme rules, operational documents, scopes and member information.
IECEE Online Certificates (OCS): verification of published certificate information.
IECEE OCS User Guide: current certificate-data fields include product/model, factories, test-report reference, national differences, customer testing facility information and the standard reference for the tested sample.
IEC Guide 115:2023: IEC guidance on measurement uncertainty for conformity-assessment testing used in IECEE contexts.

IECEE procedures and individual CBTL/NCB scopes can change. Recheck the current official scope and document version at the time of booking.

FAQ: choosing and using a CB test laboratory

Is any ISO/IEC 17025 laboratory suitable for a CB Scheme project?

No. ISO/IEC 17025 competence is relevant to testing laboratories, but for a CB Scheme project you should verify that the laboratory is accepted as a CBTL for the required IECEE scope and identify the responsible NCB. A generic accreditation alone does not establish CB scope for every standard.

How many samples should I send for CB testing?

There is no single universal number. The laboratory should determine the sample set from the applicable standard, model family, worst-case configurations, destructive tests and any national-difference testing. Obtain the sample plan before shipment.

Can a previous CB Test Report eliminate all new testing?

Not automatically. Reuse depends on the product being sufficiently identical to the tested configuration, the standard edition and scope remaining suitable, and the NCB/receiving body accepting the evidence. Changes can lead to construction review or selected retesting.

Should national differences be included in the first test campaign?

If target markets are already known, discussing their national differences before testing can reduce later gaps and repeat samples. The exact approach depends on the countries, standard and NCB/CBTL scope, so it should be agreed in the written test plan.

What should happen after a test failure or design change?

Document the failed clause and configuration, the corrective change and its possible impact on other requirements. The CBTL/NCB should determine and record the appropriate construction review and retest scope before the final evidence is relied upon.

Does a CB Test Certificate by itself authorize sale in every participating country?

No general assumption should be made. The CB package is used for mutual recognition of test results and can support national certification or approval, but the target market may impose its own certification, registration, marking or other conditions.