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The marks on a cable datasheet answer different questions, not the same one. Fire marks split into circuit integrity under fire conditions and flame propagation along the run. Halogen-free and low-smoke marks are separate tests again, one family for acid gas content and corrosivity, another for smoke density. Hygienic references such as EHEDG and cleanroom references such as ISO 14644-1 are a third concern, and they certify equipment or classify a room rather than certify a cable. Match each mark to the review the facility actually faces, and treat the datasheet and the named standard as the source of record.
This guide is for facility, compliance and procurement engineers who see five or six marks on one page with nothing ranking them. It does not re-explain fire-resistant or halogen-free cable from a standing start, because our fire-resistant cables piece, our combined fire and halogen-free piece and our LSZH piece already do that at product level. The job here is to say which question each mark answers.
What's the difference between a fire-resistant cable and a flame-retardant cable?
They get lumped together as fire performance, and they test different failure modes. Fire resistance is about keeping a circuit working. Flame retardance is about keeping fire from travelling along the cable. Picking the wrong one can leave a code requirement unanswered while the datasheet still looks reassuring.
Circuit integrity is the domain of the IEC 60331 series, which concerns whether a cable keeps its circuit functioning under the fire conditions the standard specifies. That is what a life-safety or emergency circuit cares about: the alarm, the pump or the control line still running while the fire burns. The exact conditions belong to the standard and to the product's own test record.
Flame propagation is a different family, and its parts are not interchangeable. IEC 60332-1-2 concerns vertical flame propagation for a single insulated wire or cable, while IEC 60332-3-24 concerns bunched cables under its own category. A result on one cable says nothing definitive about how a full bundled run behaves in a tray, which is worth knowing before a single-cable citation is read as cover for the whole installation.
The point to carry away is that a fire-resistance reference and a flame-propagation reference answer different questions, and a regulated facility usually needs to know which one its code calls for. When a datasheet cites a standard, read it as pointing at a defined test class rather than offering a general assurance about fire.
What does an LSZH or halogen-free mark actually certify?
Low-smoke zero-halogen is among the most over-read terms on a datasheet. It does not mean non-toxic, and it does not mean the circuit survives a fire. It points at specific, separately tested properties, and they are worth reading separately.
Halogen content and its consequences sit in their own family. IEC 60754-1 covers the determination of halogen acid gas content in materials taken from cable construction, and IEC 60754-2 covers the determination of acidity and conductivity of the gases evolved, generally on those same construction components. Both describe what the burning material gives off in terms of acid gas and potential corrosivity, which is an equipment-damage concern rather than a visibility one.
Smoke density is a different standard again. IEC 61034-2 covers the measurement of smoke density for cables burning under the conditions it defines, which is the visibility and escape concern in an occupied space. A full low-smoke and halogen-free story is therefore several tested properties with separate references, not one guarantee. Two datasheets can both print the phrase while citing different scopes, and that is exactly why the datasheet rather than the phrase is the source of record.
UL is worth reading carefully too, because it is a separate certification track that matters most for facilities with North American ties. The distinction to look for is whether the product is UL Listed or UL Recognized: a Recognized Component is evaluated for use inside a larger end product and carries conditions of acceptability that govern how it may be used, while Listing concerns the finished item itself. Reading a UL mark means reading which of the two it is, and under what conditions.
How do hygienic design and cleanroom marks differ from fire marks?
Fire and low-smoke marks describe how a cable behaves while it burns. Hygienic and cleanroom references describe a completely different life: the surface, the material and the room in normal running conditions. Treating them as one requirement is a common way to mis-specify a regulated line.
EHEDG certification applies to the hygienic design of named equipment, and the certificate itself identifies the product, its types, sizes and seal materials. Some equipment is assessed by design review rather than by a cleanability test, which is another reason to read the certificate rather than the badge.
The LAPP hygienic gland certificate shows how narrow that scope is in practice. It names specific stainless steel SKINTOP® HYGIENIC variants and sizes together with SKINDICHT® hygienic blind plugs and their gasket material, for a stated equipment class and for open process applications, and it runs to a stated expiry date. It does not reach every gland in the family, and it says nothing about a cable, a connector or a finished machine. Check the certificate number and date on the product record rather than a certification field label in a product listing.
Cleanroom references work differently again. ISO 14644-1 classifies a room or zone by airborne particle concentration, which describes the space rather than the cable running through it. Neither reference certifies a cable. The EHEDG certificate covers only the glands and blind plugs it names, the ISO classification describes the room's air, and the cable itself has to be checked against its own datasheet and test reports. The gland and cable entry are usually where the hygienic question actually lands, and our guide to selecting glands for IP-rated enclosures covers that interface.
The table below lines each mark up against the question it answers, which is the fastest way to see that they are not interchangeable.
| Mark or reference | The question it answers | What it is not |
|---|---|---|
| IEC 60331 series | Does the circuit keep working under the specified fire test conditions | A statement about flame spreading along the run |
| IEC 60332-1-2 | Does flame propagate vertically on a single insulated wire or cable | A result for a bunched run, which is tested separately |
| IEC 60332-3-24 | Does flame propagate vertically on bunched cables under that category | A circuit-integrity result |
| IEC 60754-1 and -2 | Halogen acid gas content, and potential corrosivity by pH and conductivity | A smoke-density result, or a general non-toxic claim |
| IEC 61034-2 | Density of smoke emitted by cables burning under the defined conditions | A halogen, corrosivity or circuit-integrity result |
| EHEDG certificate | Hygienic design of the named equipment, types, sizes and seal materials | A certification of a whole product family, a cable or a finished machine |
| ISO 14644-1 | Classification of a room or zone by airborne particle concentration | A certification printed on the cable |
| UL Listed or UL Recognized | Whether the item is certified as a finished product or as a component for use in one | A single blanket UL approval covering every use |
One boundary is worth stating outright. LAPP does not issue or interpret a facility's fire code sign-off, its good manufacturing practice certification or its cleanroom qualification. Those belong to the reader's fire authority, quality team or certification body. The standards named here are general test references rather than site-specific advice, and the datasheet and the standard text remain the source of record for the exact test criteria in every case.
Talk to Our Engineers
When a datasheet lists several marks and it still is not clear which one answers the review a facility faces, that is the point to bring an engineer into the reading rather than guess at it.
The details that make that quick are the review the facility has to pass and who is signing it, the cable types and part references already under consideration, the exact marks and certificate numbers printed on their datasheets, the installation arrangement, single run or bunched in a tray, and the cleaning or environmental duty at the equipment interface.
Talk to our connectivity specialists through the LAPP SEA enquiry page. LAPP publishes its company and quality-management certificates as dated downloads, each naming its issuing body, with validity periods where they apply, and a per-product approval is a separate question that belongs with that product's own record. LAPP engineers and produces cables and connectors, so a mark on the cable and a certificate on the gland can be read against the same installation in one conversation.
