Bs 8491 — Pdf

| Standard | Typical Cable Size | Fire Duration | Water Spray? | Mechanical Shock? | Primary Application | |----------|--------------------|---------------|--------------|-------------------|----------------------| | | Large (>20mm) | 60 min + 15 min | Yes | Yes | SHEVS, firefighting lifts, critical systems | | BS 6387 | Small/medium (<20mm) | Up to 180 min (categories C,W,Z) | Yes (W test) | Yes (Z test) | General emergency circuits | | BS 8434-2 | Small/medium | 60 or 120 min | Yes | Yes | Residential and commercial alarm systems | | IEC 60331 | Any | 90 min (typical) | No | No | Basic fire resistance only |

: It applies to cables with a rated voltage up to and an overall diameter greater than 20 mm . bs 8491 pdf

The standard itself does not specify an expiry, but best practice and regulatory bodies recommend re-certification every 5 years, or whenever the cable construction changes. | Standard | Typical Cable Size | Fire