Iec 60754-1 Free Download

[Giordano Thibault]

Part1 of BS EN 60754 specifies the apparatus and procedure for the determination of the amount of halogen acid gas, other than hydrofluoric acid, evolved during the combustion of compounds based on halogenated polymers and compounds containing halogenated additives taken from electric or optical fibre cable constructions.

The method specified in this standard is intended for the testing of individual components used in cable construction. The use of this method will enable the verification of requirements which are stated in the appropriate cable specification for individual components of cable construction.

IEC 60754-1 (BS EN 50267) was developed due to concerns expressed by cable users over the amount of acid gas which is evolved when some cable insulating, sheathing and other materials are burned, as this acid can cause extensive damage to electrical and electronic equipment not involved in the fire itself.

This standard provides a method for determining the amount of acid gases evolved by burning cable components so that limits can be agreed for cable specifications. As the test is not carried out on a complete cable test piece for a hazard assessment, the actual material volumes of the cable components should be taken into consideration.

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Product claims about low-smoke halogen-free (LSHF)-also known by the industry as low-smoke zero-halogen (LSZH)-have been with us for some time now. Of note, these claims are frequently self-certified and tests used may not be standards-based. More importantly, there are some misconceptions about what some tests actually cover, which this article aims to clear up.

LSHF cable products have traditionally been found in the power and control categories, but now have branched out to categories including data/telecom cables, fiber-optic cables and appliance wire and cable. They also are being used in more locations than the traditional confined spaces (tunnels, subways, ships, submarines and mines), and are now also found in hospitals and data centers. UL will be proposing the optional HF and LSHF Marking for the 2020 edition of the National Electrical Code.

Asia and South America are also adopting LSFH wire and cable, which has been the EU approach to cable standards. In a global economy manufacturers now have access to a standards-based LSFH cable designation, and cable designers can produce one design that can be sold and applied around the world.

To better understand LSHF, we need to consider what a halogen is in terms of the Periodic Table of Elements. The five halogen elements found in Column 17 are fluorine, chlorine, bromine, astatine and iodine. The three primary elements found in insulation, filler and jacket materials/components are chlorine, bromine and fluorine.

IEC 60754-1. Under the UL 2885 standard, combustible materials are evaluated for the amount of Hydrogen Chloride (HCl) and then classified to a Performance Level Category (PLC). The PLC chart as shown in Table 8.1 of UL 2885 was developed by UL and is not found in IEC 60754-1. Combustible materials (insulation, jacket, fillers, tapes, etc.) evaluated under this service/standard(s) would not make claims or assertions to the halogen content of the material(s) and are not appropriate for use in validating cable products or their material components as non-halogen (ed.), zero halogen, halogen-free, low halogen or LSZH.

Under the optional Cable Surface Mark program, no reference is permitted, within the UL print legend surface print, regarding non-halogen, non-halogenated, zero halogen, low halogen or LSZH or reference material provided by the cable manufacturer at these designations are not covered in the IEC 62821-3 standard.

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