IEC TS 60695-11-12:2026 – Fire hazard testing

IEC TS 60695-11-12:2026 belongs to the IEC 60695 series on fire hazard testing and addresses a specific failure mode: burning droplets escaping from an enclosure after internal ignition. The specification defines a method for examining whether openings in the bottom of an enclosure keep burning material contained. This page summarizes its scope, application context and related series structure for engineers and quality professionals.

Standard Information

IEC TS 60695-11-12:2026 is a technical specification covering fire hazard testing, specifically a burning droplets test for finished units. Published as a technical specification rather than an International Standard, it serves product committees preparing safety documents and may later be elevated to horizontal status. The key bibliographic facts are listed below. - Designation: IEC TS 60695-11-12:2026
- Full title: Fire hazard testing - Part 11-12: Test flames - Burning droplets test for finished units
- Status: Current
- Publication date: 2026-09-02
- ICS classification: 29, 29.020
- Technical committee: TC 89

Scope and Application

The specification describes a test method for investigating whether the bottom part of an enclosure that has openings can contain burning droplets inside the enclosure when ignition occurs within a finished unit. The test therefore focuses on enclosure base geometry rather than on the flammability of the material itself. Its stated purpose is to verify whether the openings in the bottom of an enclosure are small enough to reduce the risk of a flame propagating outside the enclosure of a finished unit. Application is primarily indirect. Technical committees use the document when preparing their own safety publications, following the principles laid down in IEC GUIDE 104 and ISO/IEC Guide 51. Product standards may then reference the method when enclosure design must be assessed for droplet containment. Manufacturers and test laboratories apply it through those referencing documents rather than as a standalone requirement. The document currently does not hold the status of a horizontal safety publication. However, the intention stated within it is to become one if it is transformed into an International Standard. Readers should treat it as a test method description whose binding force depends on the product standards that cite it.

Products and Materials Covered

The object of the method is the finished unit, not a material sample. This distinguishes it from many fire hazard tests that evaluate coupons or plaques. The method examines enclosures with openings in their bottom part, where internal ignition could generate burning droplets capable of passing through those openings and igniting material or surfaces below. The ICS classification of 29.020 places the document within electrical engineering in general, indicating relevance across electrotechnical products rather than a single equipment category. Any finished electrotechnical unit whose enclosure base contains ventilation or drainage openings falls within the intended assessment concept. The specification does not restrict itself to particular enclosure materials; the property under examination is the opening size in relation to droplet escape, applicable to whatever enclosure construction the finished unit employs.

Testing and Compliance Considerations

In practice, an accredited laboratory performs this type of assessment as part of type testing on a finished unit, following the method as referenced by the applicable product standard. The laboratory documents the test setup, the condition of the specimen and the observed behaviour of burning droplets relative to the enclosure openings. Because the specification defines a method, acceptance criteria and any pass/fail judgement normally come from the citing product document rather than from the specification alone. For procurement and quality teams, several points deserve attention. Reports should identify the standard applied, the specimen configuration and the observations recorded, so that results can be compared between designs or suppliers. Retest triggers typically include changes to the enclosure geometry, the size or pattern of bottom openings, or internal components that could alter ignition behaviour. When results are disputed, a review of specimen preparation, test conditions and report documentation is the usual first step before repeat testing is arranged.

Related Standards and Series Context

The designation itself carries structural information. IEC 60695 is the fire hazard testing series; the letters TS identify the document as a technical specification, a deliverable type used when content is not yet mature enough for an International Standard. Part 11-12 sits within the "Part 11" grouping for test flames, with the sub-part number indicating a specific test flame method within that group. The suffix ":2026" identifies the publication year of this edition. Because the document is part of a numbered series, product committees reference it alongside other test methods selected for the fire hazard scenarios relevant to their equipment. The stated ambition to become a horizontal safety publication, if transformed into an International Standard, reflects the series architecture in which broadly applicable fire hazard methods serve many product committees. Readers who need the authoritative text should obtain it from official IEC sources; this page is an interpretive overview only.