First, the national quality monitoring all maintenance and Quarantine and the National Standardization Management Committee in 2007, published April 16, 2007 No. 2 "People's Republic of China National Standard agreed announcement", agreed to issue a total of 50 national standards, during which the national wire and cable standard 3, which reads as follows:

1, GB / T .1-2007 rated voltage of 750V or mineral insulated cables and terminals - Part 1: Cables (replace GB / T.1-1991, GB / T .3-1991).

2, GB / T .2-2007 rated voltage of 750V or mineral insulated cables and terminals - Part 1: Terminal (replace GB / T.2-1991).

3, GB / T -2007 rated voltage of 300 / 500V subsistence way of action and anti-icing heating cable heating commission.

Second, the performance of commodity specification Q / HHTZH004.2 fire retardant properties to perform experiments GB12666-90 specifications.

Third, the use of additional communication characteristics 1. Voltage: U0 / U 450 / 750KV.