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A switchgear type-test report is the single most objective document in a procurement file. Price lists, brochures and sales decks can all be negotiated — but a type-test report records what a specific design actually survived in a laboratory. Knowing how to read one separates a buyer who assumes compliance from a buyer who verifies it.
This guide is written for B2B purchasers, EPC contractors and consulting engineers who specify medium-voltage switchgear and need to validate a supplier’s test documentation before signing off. It walks through the structure of a report, the seven items that matter most, and the red flags that should stop a purchase order.
The first thing to confirm is which kind of test the document describes. Confusing the two is the most common and most expensive mistake in switchgear procurement.
| Aspecto | Type test | Routine test |
| What it proves | O design meets the standard | Isso individual unit was built correctly |
| Frequência | Once per design / rating envelope | Every unit leaving the factory |
| Destructive? | Often yes — samples are stressed to failure limits | No — non-destructive verification |
| Typical tests | Dielectric, temperature rise, short-time withstand, internal arc, mechanical endurance | Wiring check, dielectric at reduced level, functional operation |
| Covers your model? | Only if your rating falls inside the tested envelope | Only for the exact serial number tested |
A routine test certificate is not a substitute for a type-test report. If a supplier hands you a one-page “test certificate” listing only wiring checks and a functional operation test, you are not looking at proof of design compliance — and you should ask for the full type-test report before proceeding.
Before reading a single measured value, verify the identity block on the cover page. In practice, most non-conformances are caught here, not in the test data.
Once the identity block checks out, work through the technical clauses. These seven items cover what actually determines whether the switchgear is safe and fit for your application.
Look for two separate withstand tests: power-frequency withstand voltage (typically 1 minute) and lightning impulse withstand voltage (typically 1.2/50 µs). Read them across three paths — phase-to-earth, phase-to-phase, and across the open switching device (isolating distance).
The numbers you read are usually given as rated values from the standard’s tables, with the applied test voltage in the same column. Confirm the applied value equals or exceeds the rated value for your rated voltage, and that no disruptive discharge occurred. Partial discharge measurement, where included, is a useful supplementary indicator of insulation quality.
This test proves the assembly can carry its rated current continuously without overheating. The report must state: the test current (usually rated current, sometimes 1.1× for certain assemblies), the ambient conditions, and the measured temperature rise of contacts, terminals and accessible surfaces.
Compare the measured values against the limits in the standard for each material and component type — bare copper contacts, bolted connections, silver-plated joints and insulating materials each have different permitted rises. A report that records only “passed” without the measured rises and the ambient baseline is incomplete.
This is the clause that matters most for fault conditions in service. Verify:
The pass criteria are no permanent deformation, no welding of contacts, and successful verification afterwards by a dielectric test and a functional check. If the report omits the post-test verification, treat the result as incomplete.
If personnel safety is in your specification, this clause is non-negotiable. An IAC classification states the accessible sides (e.g. A = front, F = front, L = lateral, R = rear), the arc fault current and the duration — for example “A FLR, 25 kA, 1 s”.
Read the accessible-side coding carefully: a classification restricted to “A” (front only) does not protect an operator standing at the rear of the cubicle. Also check whether the classification applies to the circuit-breaker compartment, the busbar compartment, the cable compartment or all of them, and whether pressure-relief ducting was fitted during the test. For a deeper treatment of how arc-fault containment is engineered, see our article on internal arc fault suppression in medium-voltage switchgear.
Verify the IP code on the enclosure and, for withdrawable designs, whether the rating applies with the truck in the connected, test and disconnected positions. For outdoor or public-area installations, an IK rating for mechanical impact resistance is equally relevant. A mismatch here is one of the most common causes of premature insulation failure in humid or dusty environments.
Check the number of operating cycles performed (the standard defines M1/M2 or E1/E2 classes for the switching device) and confirm the report includes verification of the safety interlocks: that the earthing switch cannot close on a live circuit, that the withdrawable truck cannot be racked in or out with the breaker closed, and that compartments cannot be opened while live. These interlocks are what prevent the majority of serious switchgear incidents.
The assembly report covers the enclosure and busbar system, but the interrupting device is tested to its own standard. For vacuum circuit breakers that is IEC 62271-100. Confirm the breaker’s own type test covers the short-circuit breaking current and the rated operating sequence at your system voltage. If your assembly uses a withdrawable truck, an indoor vacuum circuit breaker of the same series as the tested sample is what keeps the combined assembly valid.
Watch for these — each one indicates the documentation does not actually cover what you are buying.
| Need the full type-test report for your project specification? Send us your required ratings — rated voltage, Icw/Ipk, IAC class and applicable standard edition — and our engineering team will return the matching test documentation and a compliance comparison for your tender file. |
A type test validates a design against a standard and is performed once per design and rating envelope, often destructively. A routine test is performed on every individual unit before shipment and only confirms that the unit was assembled and wired correctly. Only a type test proves that the design can withstand dielectric, thermal and short-circuit stresses.
For factory-assembled metal-enclosed switchgear rated above 1 kV and up to 52 kV, the reference standard is IEC 62271-200 (national equivalents include GB/T 3906). The switching device inside is separately covered by IEC 62271-100 for circuit breakers. Always confirm the edition year cited in the report matches the edition your specification requires.
Not automatically. A report is valid for the ratings actually tested. Higher ratings require either a new test or a formal extension report issued by the testing laboratory based on defined similarity rules — covering aspects such as identical enclosure geometry, busbar arrangement and insulating materials. Without that extension document, a higher rating is unproven.
The report itself does not expire as long as the design, ratings, materials and critical component suppliers remain unchanged. However, the edition of the standard may be superseded, and many utilities and EPC contractors require reports issued within a certain number of years or against the current edition. Reputable manufacturers re-test or issue updated reports when a new edition is published.
It means the assembly withstood an internally initiated arc fault of 25 kA for 1 second while protecting personnel on the accessible sides declared: front (F), lateral (L) and rear (R). The leading “A” indicates the type of accessibility. Pay attention to which compartments were tested and whether pressure-relief ducting was installed, as these conditions limit how the classification transfers to your installation.
Yes. Oscillograms are the raw evidence that the test was actually performed at the stated current and duration, and photographs of the sample before and after testing confirm the object tested. Together they are the fastest way to distinguish a genuine full type test from a summary document.
The assembly and the switching device are tested to their respective standards, and the combination must be consistent. The truck-mounted circuit breaker needs its own IEC 62271-100 type test at the relevant voltage and breaking capacity, and the mechanical interlocks between truck and cubicle must be verified within the assembly test. Check that the breaker series in the report is the same series quoted to you.
Ask for an English translation issued by the testing laboratory or a certified translation covering the identity block, test clauses and conclusions. For international tenders, the summary page plus the standard and rating tables are usually sufficient for pre-qualification, with the full translation supplied at contract stage.
Before a report goes into your tender file, run this quick check. If you answer “no” to any of the first four, stop and request clarification.
| Check | Requirement |
| 1. Standard + edition | IEC 62271-200 (or GB/T 3906) with edition year matching your spec |
| 2. Model match | Type designation identical to the quoted product, or a lab-issued coverage report |
| 3. Rating envelope | Your required voltage, current and Icw/Ipk fall inside the tested values |
| 4. Independent lab | Accredited third-party laboratory named, with scope stated |
| 5. Dielectric | Power-frequency and impulse values recorded across all three paths |
| 6. Temperature rise | Measured rises plus ambient baseline stated, within limits per component |
| 7. Icw / Ipk | Duration stated (1 s or 3 s), earthing circuit rated, post-test checks recorded |
| 8. IAC | Accessible sides, current and duration declared per compartment |
| 9. Device compliance | Breaker tested to IEC 62271-100 at your system voltage |
| 10. Evidence | Photographs and oscillograms present, report numbered and dated |
Reading a switchgear type-test report is a skill that pays for itself on the first project where it catches a mismatch. Start with the identity block, confirm the rating envelope covers your order, then work through dielectric, thermal, short-circuit, internal arc and mechanical evidence in that order. Insist on measured values rather than bare “pass” statements, and treat any missing duration, missing compartment detail or missing laboratory accreditation as a question to be answered — not a formality to be waived.
Well-documented switchgear is not an accident of marketing; it is the result of a design that was actually built to a standard and actually tested. Asking for the report is the fastest way to find out which one you are being offered.
| Specifying switchgear for an upcoming project? Tell us your system voltage, fault level and IAC requirement. We will match you to a tested KYN28-12 withdrawable switchgear configuration and provide the supporting type-test documentation. |
