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BS EN 50525-3-41:2011
Electric cables. Low voltage energy cables of rated voltages up to and including 450/750 V ($7IU$d0/U$7R). Cables with special fire performance. Single core non-sheathed cables with halogen-free crosslinked insulation, and low emission of smoke (British Standard)
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British Standards Institution [bsi]
British Standards Institution [bsi]