... One, use: Is exempt from the overvoltage harm for the single cable to design. Electric cable armor coat protector:one, use ... : Is exempt from the overvoltage harm for the single cable to design. Two, materials behaviors: By imports the ZNO ... seal, artisticly, durable and so on merits.Three, principles of work, the electrical specificationFour, technical standards: DL/T401 GB11032-2000 IEC60099 ...