Cable Fire Resistant Test Equipment | IEC 60331, BS 6387

The Fire Resistant Cable can work properly for a certain period of time when subject to a fire. The specified fire conditions normally are a propane gas flame at a temperature of 650 to 950 degrees, with/without mechanical shock, or spray water.  

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The structure of fire resistant cables is similar to ordinary cable, what the differences are:

1)      Adopts copper conductor to achieve higher melting point;

2)      Increase a fire resistant layer between the conductor and the insulation layer. The fire resistant layer is typically a multi-layer of mica material tape.

The structure ensures the fire resistant cable work properly for a certain time in the event of a fire. This characteristic determines fire resistant cable can be used in critical electrical circuits, such as power supply circuits for emergency power of fire-fighting equipment, fire alarm equipment, ventilation and smoke exhaust equipment, emergency indicator lights, and emergency elevators.

Fire Resistant Cable vs Flame Retardant Cable

In parallel to fire resistant cables, flame retardant cables are another significant category.

The flame retardant cable will not propagate or convey a flame when subject to a fire, and after the external fire source is extinguished, the cable can be self-extinguished, or flame spread within a limited distance.

The structure of flame retardant cables is basically the same as the ordinary cable, the difference is all or parts of the cable&#;s insulation layer, sheath layer, and auxiliary parts are made of flame retardant materials. Using flame retardant materials makes the cable less flammable, limits flame spread and better self-extinguish capacity when exposed to a fire.

Fire resistance cable and flame retardant cable improve the safety of cable when subject to a fire. While fire resistance cables are generally used in critical circuits to ensure the circuit integrity for critical functions to continue at a specific time in the event of a fire. And the flame retardant cables are used wider since it doesn&#;t promote the spread of fire.

For more information on the flame retardant cable fire tests and classification, refer to &#;European Cable Fire Testing and Classification&#;.

Fire Resistant Test Standards for Cable

EN

Method of test for resistance to fire of unprotected small cables for use in emergency circuits

IEC Series

IEC -1 &#; Test method for fire with shock at a temperature of at least 830 °C for cables of rated voltage up to and including 0.6/1.0 kV and with an overall diameter exceeding 20 mm

IEC -2 &#; Test method for fire with shock at a temperature of at least 830 °C for cables of rated voltage up to and including 0.6/1.0 kV and with an overall diameter not exceeding 20 mm

IEC -3 &#; Test method for fire with shock at a temperature of at least 830 °C for cables of rated voltage up to and including 0.6/1.0 kV tested in a metal enclosure

IEC -21 &#; Procedures and requirements &#; Cables of rated voltage up to and including 0.6/1.0 kV

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IEC -23 &#; Procedures and requirements &#; Electric data cables

IEC -25 &#; Procedures and requirements &#; Optical fibre cables

BS

Test method for resistance to fire of cables required to maintain circuit integrity under fire conditions

BS Series

BS -1 Methods of test for assessment of the fire integrity of electric cables - Part 1: Test for unprotected small cables for use in emergency circuits - BS EN with addition of water spray

BS -2 Methods of test for assessment of the fire integrity of electric cables - Part 2: Test for unprotected small cables for use in emergency circuits - BS EN with a 930 degree C flame and with water spray

BS

Method for assessment of fire integrity of large diameter power cables for use as components for smoke and heat control systems and certain other active fire safety systems

DIN -12

Fire behaviour of building materials and elements - Fire resistance of electric cable systems required to maintain circuit integrity - Requirements and testing

SS 299:

Fire-resistant cables of rated voltage up to and including 600/ V for fixed installations, having low emission of smoke and corrosive gases when affected by fire &#; Requirements and test methods

This is critical so that life-saving electrical installations, such as fire alarms, smoke detectors, PA systems, and emergency lighting, can perform their functions in the event of a fire.

In addition to complying with LSZH flame retardant (FRT) tests (IEC , IEC , and IEC ), LSZH FR cables are also tested to IEC -21, BS or SS 299 to ensure that the fire-resistant cables maintain circuit integrity under fire conditions. In this article, we introduce the differences among the 3 common LSZH FR test standards.

Resistance to Fire: SS 299

Singapore Standard SS 299 specifies tests for fire-resistant cables. This standard was updated in September , and it is a modified adoption of British Standard BS :, 'Test method for resistance to fire of cables required to maintain circuit integrity under fire conditions'. 

FR cables must pass protocols C, W, and Z test parameters to be considered fully compliant.

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