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並前往http://higiene.unex.es/Bibliogr/ISO_BS_USDA/ISO_BS/BS%20EN/BS%20EN%2061439-1-2011.pdf

Low-voltage switchgear and controlgear assemblies - Part 1

It is identical to IEC 61439-1:2011. It supersedes BS EN 61439-1:2009, which will be withdrawn on 23 September 2014. The UK participation in its ...

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