The UK specialist in lighting connection products, Flex Connectors, explains why LSF (Low Smoke and Fume) and LSHF (Low Smoke Halogen Free) are different, and offer different safety factors in case of fire. The company indicates that LSF is an imprecise label, and that cables can contain materials which emit dense smoke in case of fire as well as acidic gases.
LSHF cables, as defined by BS 50525-3-11, on the other hand produce reduced smoke in case of fire, so less reducing visibility and escape. These cables should respect EN 50267-2-1 which stipulates that HCl emissions must be < 0.5% and EN 60684-2 which stipulates that visibility must not be reduced by more than 40%. Flex Connectors offers a range of lighting power and control cables and connection boxes which are LSHF to BS 50525-3-11 in the modular Flex7 range.
“LSF vs LSHF – Do you know the difference?”, https://www.flexconnectors.co.uk/lsf-vs-lshf-do-you-know-the-difference/
BS EN 50525-3-11:2011 = “Electric cables. Low voltage energy cables of rated voltages up to and including 450/750 V (U0/U). Cables with special fire performance. Flexible cables with halogen-free thermoplastic insulation, and low emission of smoke” http://shop.bsigroup.com/ProductDetail/?pid=000000000030188834