Cable Knowledge

Flame-Retardant vs Fire-Resistant vs LSZH Cable

Cable fire terminology is often misused in inquiries. Flame-retardant cable limits flame spread, fire-resistant cable is intended to maintain circuit function for a test duration, and LSZH addresses smoke and halogen emissions.

Flame Retardancy

Flame tests evaluate how a cable or cable bunch propagates flame under defined burner conditions. Passing does not mean the cable remains operational during a fire.

Fire Resistance

Circuit-integrity tests expose cable to fire, sometimes with mechanical shock or water, while monitoring electrical continuity. The exact test and duration must be stated.

Low Smoke and Halogen-Free

Smoke-density and acid-gas tests address visibility and corrosive emissions. They do not alone establish flame spread or circuit integrity.

Procurement Wording

Avoid descriptions such as 'fireproof LSZH cable' without standards. List every required test, classification and report so supplier offers can be compared.

Write Three Separate Lines in the Specification

If a project needs all three properties, list flame-spread classification, smoke/halogen criteria and circuit-integrity test with duration independently. This prevents a supplier from answering one broad fire claim with evidence for only one property.

Name each test standard.
State classification or duration.
Require reports for the offered construction.

Information to Confirm

Fire risk and required circuit function
Flame test and category
Circuit-integrity test and duration
Smoke and halogen criteria
Cable construction and environment
Required reports and approvals

Engineering note: Fire cable selection must be coordinated with the project's fire engineer and authority requirements.

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