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Fire and Performance Cable Systems
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Pyro Mi
- Survives the fire test requirements for enhanced grade cables as defined in BS 5839: part 1:2002.
- Is approved by LPCB for categories C, W and Z in BS 6387: 1994.
- Attains categories C, W and Z of BS 6387:1994 with a single cable sample.
The new edition of BS 5839-1:2002 (Fire detection and alarm systems for buildings - Part 1: Code of practice for system design, installation, commissioning and maintenance) describes two levels of fire performance for fire rated cabling for fire alarm systems.
These performance levels have now been published within a British Standard. BS 8434: 2003 Parts 1 and 2 (Methods of test for the assessment of the fire integrity of electric cables). Pyro MI easily complies with and exceeds all the requirements for Enhanced Grade and Standard Grade described within these standards.
Fire Performance BS 6387: 1994 Performance Requirements for Cables Required to Maintain Circuit Integrity under Fire Conditions. This standard details the following tests to categorise cables according to their fire withstand capabilities.
Resistance to Fire 950°C for 3 hours - Category C
The cable is tested by exposure to gas burner flames while passing a current at its rated voltage. Four survival categories are defined in the table below.
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Symbol |
Pyro MI |
| 650°C for 3 hours |
A |
Surpasses |
| 750°C for 3 hours |
B |
Surpasses |
| 950°C for 3 hours |
C |
Surpasses |
| 950°C for 20 minutes |
S |
Surpasses |
Resistance to Fire with Water Spray 650°C - Category W
A new sample of cable is exposed to flames at 650°C for 15 minutes whilst passing a current at the rated voltage and then the spray is turned on to give exposure to both fire and water for a further 15 minutes. A single survival category is defined in the table below.
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Symbol |
Pyro MI |
| 650°C for 3 hours |
W |
Surpasses |
Resistance to Fire with Mechanical Shock 950°C Category Z
A fresh sample of cable is mounted on a backing panel in an S-bend and is exposed to flames whilst the backing panel is struck with a solid steel bar the same diameter as the cable under test every 30 seconds for 15 minutes whilst the cable has been exposed to temperatures as defined in the table below.
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Symbol |
Pyro MI |
| 650°C |
X |
Surpasses |
| 750°C |
Y |
Surpasses |
| 950°C |
Z |
Surpasses |
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