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DESCRIPTIONS 1 2 3 Flame Retardant Cable (FR) Halogen Free Cable (HFC) (Zerotox) Low Halogen Cable (LHC)

1 Flame Retardant Cable (FR) The Flame Retardant range of electric power, telecommunication and control cables are specially designed to reduce the propagation of fire along the cables. Use of Flame Retardant (FR) outer sheathing material provides a cost effective performance improvement. Whilst Flame Retardant cable reduces flame propagation, it does not burn cleanly. When these cables burn they give off large quantities of toxic gasses and smoke. They are furthermore not designed to maintain circuit integrity when burning. Construction: Conductors Stranded Copper or Solid Aluminium Sizes 1.5mm to 1000mm Number of Cores Single, two, three, four, seven, nineteen, thirty seven* Insulation Material PVC or XLPE Bedding Material PVC Armour Armoured or Unarmoured, SWA or AWA* Outer Serving Flame Retardant PVC Specification SANA 1507, BS 6346, BS 5467 Test Methods IEC 60332 * As appropriate for conductor size and number of cores. Application of Flame Retardant cables: Flame Retardant cables are designed to reduce the spread of fire along a cable tray or duct. The outer serving of the cable is manufactured from flame retardant grade of PVC. As these cables are only slightly more expensive than the general purpose cables, they may be widely used without incurring a prohibitive price penalty. Identification and marking: Flame Retardant cables are identified by the presence of a Red Stripe or the letters FR embossed onto the outer sheath. 2 Halogen Free Cable (HFC) (Zerotox) The only way to completely remove hydrogen chloride gas emission from burning cables is to eliminate PVC from the cable construction. Many alternative materials are available, and in the case of insulation material, Polyethylene is a suitable substitute. This material possesses excellent dielectric properties, however its mechanical properties, particularly its thermal properties are insufficient for use as power cable insulation. Cross linking of Polyethylene provides enhanced mechanical and thermal properties, and allows XLPE to be used as a non-halogenated insulation. PVC bedding and outer sheathing material on an electric cable is replaced by EVA, a material containing no halogen. This is expensive and adds substantially to the selling price of the cable Construction: Conductors Stranded Copper or Solid Aluminium Sizes 1.5mm to 1000mm Number of Cores Single, two, three, four, seven, nineteen, thirty seven* Insulation Material XLPE Bedding Material EVA or Megalon Armour Armoured or Unarmoured, SWA or AWA Outer Serving EVA or Megalon Specification SANA 1507, BS 6724, BS 6622 (MV), BS 7211 IEC 60332, BS 4066 (Flame propagation) BS 6425 (Evolved gases) NES 713 (Toxicity) IEC 601034, BS 6722 (Smoke Density) Test Methods * As appropriate for conductor size and number of cores. Identification and marking: Halogen Free cables are identified by the presence of a longitudinal White Stripe on the outer sheath.

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