BS PD IEC TR 63139:2018 is related to the insulation coordination in TC 34 standards and providesexplanations on mathematical addition of working voltages, insulation between circuits, use ofprotective extra low voltage (PELV) and insulation between LV supply and control lineconductors in order to cover new technologies associated with the use of LED light sourcesand controllable products.Cross References:IEC 60598-1:2014IEC 61347-1:2015IEC 61140:2016IEC 60364-4-41:2005IEC 60598-1:2014/AMD1:2017IEC 61558-1IEC 604491
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