SIST EN 3475-701:2026

SIST EN 3475-701:2026 is a Slovenian standard in the Aerospace series for aircraft electrical cables. It specifies test methods for measuring how easily insulation can be stripped and how strongly the insulation adheres to the conductor, so it is used when a cable design has to be checked against a product specification or verified in a test lab.

This document is written for cable manufacturers, aerospace suppliers, test laboratories, and quality teams that need a repeatable way to assess stripping behavior on finished cables and adhesion behavior on insulated wires. It is intended to be used together with EN 3475-100.

What does SIST EN 3475-701:2026 specify?

SIST EN 3475-701:2026 covers two related cable test topics: insulation strippability on a finished cable and adhesion of the insulation to the conductor. It also states when Method A is the default and when Method B is more suitable.

The document is organized into six clauses:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Terms and definitions
• Clause 4 - Preparation of specimens
• Clause 5 - Methods
• Clause 6 - Requirements

Clause 4 sets out how specimens are to be taken and prepared, Clause 5 describes the test methods, and Clause 6 states the acceptance requirements. The bibliography also points to EN 3475-100.

What are the key requirements of SIST EN 3475-701:2026?

SIST EN 3475-701:2026 gives practical instructions for specimen selection, test setup, and pass/fail criteria. The most important points are below.

• Method selection - If the detail product specification does not name a method, Method A is the default test method. This matters because the same cable family may be assessed differently unless the product specification narrows the choice.

• Specimen preparation for stripping - Clause 4.2 says the specimen for insulation stripping is taken from the finished cable, and the measurement is done on samples taken directly from a reel or coil with minimal deformation. In practice, this helps keep the sample representative of production cable.

• Specimen preparation for adhesion - Clause 4.3.1 says the adhesion specimen is taken from individual wire before integration into a finished cable. This distinction matters because the test is aimed at the wire insulation-conductor interface, not the completed cable assembly.

• Stripping tools and reporting - Clause 4.2 requires stripping to be carried out with tools in accordance with EN 2812, and the manufacturer has to state which tools were used in the test report. That gives traceability when results are compared between labs or batches.

• Stripping capability of the jacket - Clause 5.1 measures stripping capability by the time needed to strip a defined jacket length using a suitable tool. Clause 6.1 then sets the acceptance criterion as a maximum stripping time for a suitably skilled operator. This is the key check for screened cables where jacket removal has to be practical in assembly.

• Adhesion test setup - Clause 5.2 describes both adhesion methods using a calibrated hole and an increasing tensile force until the conductor slides inside the insulating cover. The tensile speed is specified in the method. In practice, this is a controlled pull test that shows whether the insulation grips the conductor strongly enough.

• Method A and Method B acceptance - Clause 6.2.1 requires the adhesion force values for Method A to meet the values in the technical specification. Clause 6.2.2 requires each Method B measurement to meet the value in the product standard, with additional measurements and a median check if one result falls short. This gives a more robust decision path for low-adhesion materials.

• Method B use case - The scope says Method B is suitable for wires insulated with materials showing low adhesion to the conductor, because Method A can have poor repeatability for those wires. That tells engineers when to choose the method most likely to give stable, defensible results.

What changed in SIST EN 3475-701:2026 from the previous edition?

SIST EN 3475-701:2026 supersedes EN 3475-701:2017. The foreword states an editorial revision and two technical clarifications:

• the specimen for insulation stripping is taken from the finished cable
• the specimen for adherence of insulation to the conductor is taken from individual wire before integration into a finished cable

These changes mainly clarify specimen origin, which affects how test results are prepared and interpreted.

Which standards are used with SIST EN 3475-701:2026?

• EN 3475-100 - used together with this part of the series and provides the general framework for the Aerospace series cable test methods.
• EN 2812 - provides the stripping tools referenced for the insulation stripping preparation and test work.

What does the SIST EN 3475-701:2026 document contain?

SIST EN 3475-701:2026 contains the full test sequence for stripping and adhesion assessment, including specimen preparation, method descriptions, and acceptance requirements. It also includes two figures that show how specimens are prepared for Method A and Method B.

The document is useful for production testing, supplier qualification, and conformity checks on aircraft electrical cables and wires. It gives the setup for the calibrated-hole pull test, the stripping procedure for screened cables, and the reporting points needed to document the tools and results used in the test.

Because the acceptance criteria are split between the technical specification and the product standard, the document is designed to be read together with the relevant product definition. That makes it a method standard rather than a standalone product specification.