Project requirements · Fire
Flame retardance, single cable (IEC 60332-1-2)
A single vertical cable stops burning by itself after a 1 kW flame.
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Constructions that meet it
- PVC sheath (self-extinguishing): changes no layer: a property of the sheath compound. PVC sheath (self-extinguishing) (PVC). Drawbacks: Halogens.
- Halogen-free flame-retardant sheath (LSZH): changes no layer: a property of the sheath compound. Halogen-free flame-retardant sheath (FRNC / LSZH) (LSZH). Drawbacks: Filled compound; weaker mechanically, more water uptake.
- A PE sheath does not pass: A warning, not a construction.
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Tests
- IEC 60332-1-2:2025 Ed.2 (replaces 2004 + A1:2015); EN 60332-1-2: 1 kW pre-mixed flame on a single vertical sample, 60 s up to 25 mm diameter, 120 s to 50 mm, 240 s to 75 mm, 480 s above. Pass: Annex A Table A.1: char ends more than 50 mm below the upper clamp and burned length not beyond 540 mm (Currenta; Lapp gives the 50 mm rule)
- IEC 60502-2:2014 clause 19.16: flame spread test on single cables (calls IEC 60332-1-2). Pass: not read
In the base standard for some designs: IEC 60502-2:2014 clause 19.16, flame spread test on single cables (calls IEC 60332-1-2); which sheaths it applies to was not read.
How specifications state it
The most common fire clause: 'flame retardant acc. to IEC 60332-1-2'.
Where it is asked for
- almost every indoor and tray installation
- CPR class Eca
- Ex areas (IEC 60079-14)
Sources
- IEC 60332-1-2:2025 Ed.2 preview (scope; Table 1 time for flame application; Annex A Table A.1 performance requirements, new in this edition) (read in the standard)
- Currenta Brandtechnologie, 'EN 45545-2 Testing of cables' (2026), Table 1 (burned length ≤ 540 mm, undamaged > 50 mm) and Table 2 (flame times) (quoted by others)
- Lapp Ltd FAQ (60 s flame, 120 s above 25 mm; damage at least 50 mm from the upper clamp) (maker's catalogue)
- IEC 60502-2:2014 Ed.3 preview, contents 19.16 (read in the standard)