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1对—白兰 2对—白桔 3对—白绿 4对—白棕 5对—白灰6对—红兰 7对—红桔 8对—红绿 9对—红棕 10对—红灰11对—黑兰 12对—黑桔 13对—黑绿 14对—黑棕 15对—黑灰16对—黄兰。
2、经济效益低下全行业亏损企业700多家，亏损面达1/4强，行业的销售收入利税率1991年为11.7%，1995年下降为5%。由于效益连年下降，亏损企业增多，行业内资金普遍紧张，资产负债率平均高达70%。
5种主色：白色、红色、黑色、黄色、紫色5种次色：兰色、桔色、绿色、棕色、灰色通信电缆线序色谱认识举例说明：10对通信电缆色谱线序表1对—白兰2对—白桔3对—白绿4对—白棕5对—白灰6对—红兰7对—红桔8对—红绿9对—红棕10对—红灰20对通信电缆色谱线序表1对—白兰2对—白桔3对—白绿4对—白棕5对。
Power cables: cables used to transmit and distribute electricity. It is often used in urban underground power grid, power station leading-out line, internal power supply of industrial and mining enterprises and underwater power transmission line across river and sea. The proportion of cables in power lines is increasing. Power cable is a kind of cable product used for transmission and distribution of high-power electric energy in the main power line of electric power, including 1-500kv and above various voltage grades, all kinds of insulated power cables.
任意两端及任一端子与接地之间在接通1000V交流时，1min应无击穿或飞弧现象。导线与接线端子之间的接触电阻