What Do DNV, ABS, LR & BV Certifications Mean for Multi Cable Transit?

Every quotation request our factory receives for multi cable transit certifications asks one thing: does DNV, ABS, LR, or BV approval cover this module? Guessing wrong stalls a class survey.

DNV, ABS, LR, and BV certifications for multi cable transit mean an independent classification society has reviewed the module’s design, witnessed fire, watertight, and gastight tests, and issued a type approval certificate limited to specific models, cable ranges, and installation conditions.

That last part matters. The logo on a brochure tells you a supplier has some approval. It does not tell you which module, which frame, or which [fire class](https://dewinmct.com/?p=234). Below, I walk through how to read these certificates, which one your project needs, what test evidence to demand, and how a second source fits into an existing 120-frame system without breaking compliance.

How do I verify that a DNV, ABS, LR, or BV certificate actually applies to the MCT module I'm sourcing?

A sourcing engineer in Rotterdam once sent us a competitor's certificate and asked whether our TSC module fell under it. It did not, and that was the point.

Verify a certificate by matching four fields to the module: the manufacturer's legal name, the exact product designation, the approved frame and cable diameter range, and the validity date. Then confirm the certificate number on the society's public database before accepting it.

Classification society ¹ rules are precise about scope. A certificate is a contract between the society and one manufacturer for one tested configuration. If any field does not match the part in your hand, the paper does not protect you.

Type approval, product certificate, or project acceptance?

Class societies issue more than one kind of document. Buyers often treat them as interchangeable. They are not.

A type approval certificate is the document you want for sourcing. The other two support it. They do not replace it.

The four fields to match

First, the legal name. Trading companies sometimes present a factory's certificate as their own. Our BV approval names our factory, and we share the certificate number so you can search it directly on BV's database. Second, the product designation. A round TSR seal and a square TSC module are different tested designs. Third, the scope annex. It lists frame types, module sizes, cable diameter ranges, and the divisions tested, such as A-0 or A-60. Fourth, the dates. Expired approvals appear on brochures far longer than they should.

What quietly voids an approval

Even a matching certificate fails if the installation drifts from the tested configuration. Common causes include cables outside the step-core range, a different rubber compound, missing stay plates, incorrect compression, or an installer who is not an approved service supplier where class requires one. Modular sealing systems are forgiving in the field. Certificates are not.

Which classification society approval do I need if my project spans multiple regions like Europe and the Middle East?

We weigh one trade-off constantly: pay for a second class approval, or hold one approval and rely on the buyer's class accepting it. The answer depends on the project.

You need the approval of the classification society that classes the specific vessel or offshore asset, not the region. A BV type approval is widely accepted across Europe and the Middle East, and IACS mutual recognition often lets DNV, ABS, or LR surveyors accept it case by case.

Here is how the four societies typically show up in the projects we ship to. Treat this as a map of where you will meet them, not a ranking.

Class follows the asset, not the map

A shipowner chooses the class society. The flag state enforces SOLAS compliance. The class society checks that the marine penetration seals in A-class divisions meet the IMO FTP Code. So a vessel built in the Middle East for a European owner may be classed by BV, LR, or DNV. The location of the yard is not the deciding factor.

One extra layer exists for EU-flagged ships. The Marine Equipment Directive requires the wheel mark for certain fire protection items, and penetrations through A-class divisions fall within its scope. If your end user flies an EU flag, ask about MED alongside class approval.

Mutual recognition and its limits

IACS members recognize each other's type approvals ² for defined product categories. This cuts redundant testing cost. In practice, cable transits still get case-by-case review by the attending surveyor. That review goes faster when the test reports reference the same standards the surveyor's own society uses.

When no class is involved

Many of our customers build BESS containers, modular data centers, and switchgear. No surveyor visits those sites. They still ask for class approvals because the approvals prove that fire, watertight, and gastight sealing systems were tested by a third party. For vessels, the same documents support insurance and registration. For land projects, they are simply a quality proxy.

What test standards and documentation should I request to confirm fire, IP68, and pressure ratings behind these certifications?

Our QC lab logs pressure results by module batch, not by product family. That habit began after a test report was rejected because the batch number could not be traced.

Request the IMO 2010 FTP Code fire test report for the A-0 or A-60 division, an IEC 60529 IP68 report stating depth and duration, and a hydrostatic pressure resistance test covering the 0.01–0.4 MPa range, each tied to the module model and rubber compound.

A certificate summarizes tests. The reports behind it are where the real limits live. Ask for them. A serious supplier will send them within a day.

The test matrix behind the labels

Reading a pressure report

Our watertight and gastight sealing tests run across 0.01 to 0.4 MPa. That upper figure equals roughly 4 bar, or about 40 meters of water head. But the number alone is not enough. Check which side the pressure was applied to. Check whether the frame was fitted with stay plates. Check the cable fill, because an empty module and a fully loaded module behave differently under compression. Pressure resistance testing is only meaningful when those conditions match your installation.

Documentation checklist

1. Type approval certificate with its scope annex.
2. Fire test report referencing the IMO FTP Code and the tested division.
3. IP68 report with depth and duration.
4. Batch-traceable pressure test record.
5. Material declaration for the halogen-free EPDM compound.
6. Installation manual matching the tested configuration.
7. Factory quality system evidence, such as ISO 9001 and IATF 16949.

Two newer items are starting to appear in European tenders. Some buyers ask for recyclability or low-carbon material data as circular-economy criteria. Others ask whether modules can carry identification tags for seal-health tracking in a digital twin. Neither is a class requirement yet. Both are worth asking about early.

Can a certified second-source MCT supplier match my existing 120-frame system without losing classification compliance?

Dimensional compatibility taught our engineering team an early lesson: a module that fits the frame is not automatically a module that keeps the frame's certificate valid.

Yes, if the second-source module carries its own type approval certificate for the same frame dimensions, fire class, and cable range, and the complete penetration is documented against that certificate. Mixing uncertified modules into a certified frame breaks compliance.

The 120-frame format is the most common square transit standard in marine and industrial installations. Our TSC modules are built to that geometry, so they drop into existing cutouts. Compatibility gets you to the door. Documentation gets you through it.

A qualification path that keeps the surveyor comfortable

1. Send us your current module list. We return a cross-reference table mapping each existing model to a DEWIN model.
2. Request free validation samples. Fit them in one of your existing frames and check compression, step-core cable ranges, and stay plate seating.
3. Compare certificate scopes side by side. Confirm the fire division, pressure range, and cable diameters cover your penetration schedule.
4. Decide the replacement strategy. Replace the full module set in each frame rather than mixing brands.
5. Update your penetration drawings and transit register with the new model numbers and certificate reference.
6. Install per the manual and present the package to the surveyor.

Cross-reference in practice

Why we recommend full-frame replacement

Different EPDM compounds compress at different rates. A frame with two brands of modules may seal well on day one and unevenly after thermal cycling. More importantly, no certificate covers a mixed assembly. Replacing the full set costs little because the module is the cheap part of the system, and it keeps your documentation clean.

This is where a real factory helps. We cut molds in-house, so custom heights or private-label marking do not add months. We supply CAD and STEP files with each cross-reference so your drafters can update drawings before samples arrive. Spare sealing modules ship fast because we stock the common sizes. The cost saving of 40–60% against the incumbent brand is the outcome, not the starting point. The starting point is proof that the module you receive is the module on the certificate.

Conclusion

Class logos prove nothing alone. Match the certificate scope to the module, request the test reports, and qualify a certified second source with samples. We are ready when you are.

Footnotes

1. Encyclopedic definition and role of classification societies like DNV and ABS in the maritime industry. ↩︎

2. Homepage of the international association that facilitates mutual recognition between the classification societies mentioned. ↩︎

3. Official IMO resource for the fire test procedures code required for marine division certification. ↩︎

4. Authoritative IEC guide to IP ratings, essential for verifying the IP68 claims discussed in the article. ↩︎