Dc resistance of 20C conductor meets EC60228 standard (GB3956). 200 electrical insulation resistance is not less than 5000MQkm(u is much higher than the index of insulation resistance constant performance required by iec60092-353 standard). Resistance performance full of iec60332-3-22a resistance requirements (40 minutes for fire supply, carbonization height of electricity shall not exceed 2.5m)