Mains connection, pre-alarm1, alarm 2, alarm 3, Fault.
电源连接，预警1，报警点2，报警点3，故障。
Mains connection, pre-alarm1, pre-alarm 2, alarm 3, Fault.
电源连接，预警1，报警点2，报警点3，故障。
The cable are not for direct connection to a low impedance source, such as the public mains electricity supply.
本电缆不能直接连接到低阻抗电源如公用电网上。
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