The two cable should say the two line. General site said once, line two times. Then the two cable is the control cable. For example, from the distribution cabinet to the motor control box is a line, from the control box to the motor wiring, belong to the two line
Without this argument, the transmission parameter has only one parameter and two parameters.There are two loops (secondary circuit): measuring circuit, relay protection circuit, switch control and signal circuit, power supply circuit, operation circuit breaker and isolating switch electrical locking circuit all low-voltage circuit.
The two cable refers to the cables used for control, signal transmission and feedback, such as motors, operation columns, control cables, metering, protection and electrical communication cables, all of which belong to the two cable. A primary cable refers to a power cable, a cable that supplies power to the electrical equipment.
